tag:blogger.com,1999:blog-79847786259784374792024-03-17T20:03:45.884-07:00M.R.O.Rin Choi's headphone analysis blogRin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.comBlogger232125tag:blogger.com,1999:blog-7984778625978437479.post-46928273948675825192014-05-17T03:20:00.000-07:002014-05-17T15:57:09.522-07:00STAX SRM Monitor: A flashforward to the future<div style="text-align: center;">
<i>Disclaimer: This extremely rare item is owned by my good friend, vAsurada, who lives in South Korea. This article would have never been publicized had he not given me permission to do so. My infinite gratitude goes to him.</i></div>
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<b>Introduction</b><br />
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<a href="http://rinchoi.blogspot.com/2014/02/stax-ed-1-monitor-legacy-from-past.html">As previously explained</a>, STAX team up with the scientists at IRT(Institut fur Rundfunktechnik) to further enhance the sound quality of their products. And the ultimate result is ED-1, a diffuse-field simulator for SR-Λ Pro headphone released in 1988.<br />
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In addition, in order to accommodate professional needs of researchers and audiology experts, STAX release SRM-Monitor at ¥140,000, which is exactly twice the price of its equalizer counterpart. SRM-Monitor is an all-in-one package featuring a full-sized amplifier with a balanced XLR input, an unbalanced RCA input, a RCA loop output, a normal(230V) bias headphone out, dual pro(580V) bias headphone outs, and of course, a diffuse-field equalizer.<br />
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<b>Frequency response & Phase (Line in - Line out)</b><br />
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Just like ED-1, SRM Monitor does exactly what it is supposed to do. The slight roll-off observed in the sub-bass is simply due to the behavior of SRM-Monitor's RCA lineout. Such linear characteristic can not be seen when the pro & normal headphone out terminals are used.<br />
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<b>Time Domain (Line in - Line out)</b><br />
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Just like ED-1, the equalizer function of SRM-Monitor flips the absolute polarity of the signal upside down.<br />
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<b>Distortion (Line in - Line out)</b><br />
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<i>EQ off</i><br />
SMPTE IMD(60Hz, 7kHz / 1:4): 0.0006% (relative)</div>
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THD+N(A): 0.0036% (relative)<br />
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<i>EQ on</i></div>
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SMPTE IMD(60Hz, 7kHz / 1:4): 0.0003% (relative)</div>
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THD+N(A): 0.0013% (relative)</div>
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Surprisingly, distortion is quite high when equalizer is turned on. However, the result is most likely due to the RCA lineout's behavior and doesn't have much to do with the amplifier's internal configuration, as the headphone out doesn't exhibit such non-linear characteristic.<br />
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<b>With STAX SR-003 mkI (Line in - Pro bias headphone out)</b><br />
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Equalization works just like ED-1, not to mention its inverted polarity.<br />
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Above distortion measurement data clearly indicates SRM-Monitor's headphone output is free of erratic behavior observed when the RCA lineout is utilized.<br />
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<b>With STAX SR-Λ Pro (Line in - Pro bias headphone out)</b><br />
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<b>In conclusion</b><br />
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STAX SRM-Monitor possesses the same virtue as ED-1, which involves with glorious efforts from different countries joined only for the sake of investigating good sound by means of scientific approach. And due to its number of extra features and additional connectivity, the amplifier is something much more than just an equalizer.<br />
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As recent studies focused in the relationship between data and subjective assessment of headphones show that an accurate diffuse-field equalization is not the answer, hopefully STAX come up with a product as versatile as SRM-Monitor someday equipped with their own reference target. Although the days of accurate diffuse-field equalization seem to be diminishing, if not already long gone, the very fact that SRM-Monitor and ED-1 still prove to be extremely useful even today brings the very idea of reference-oriented external equalization and its practical benefit to light once again.<br />
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<b>References</b><br />
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G. Theile, "The Importance of Diffuse-field Equalization for Stereophonic Recording and Reproduction," 13. Tonmeistertagung München, 1984.<br />
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STAX. Fifty Years of Excellence. 940 East Dominguez St., Carson, CA 90746: STAX, 1988. Print.Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com111tag:blogger.com,1999:blog-7984778625978437479.post-16320120823894141252014-04-30T15:36:00.005-07:002014-04-30T15:56:57.640-07:00NVX EX10S: Aesthetics<br />
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<b>Introduction</b><br />
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Although still a new kid on the block, NVX have proven that they are formidable contenders with their flagship headphone, XPT100. On top of a great sound quality, the headphone also comes with a bunch of accessories for the users' convenience. Of course, their first in-ear monitor, EX10S, is no exception as well.<br />
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<b>Packaging</b><br />
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While the IEM comes with 15 pairs of ear sleeves, a pair of ear guides, and a carrying case, the packaging quality itself is pretty standard for the product at this price range.<br />
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<b>The Unit</b><br />
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<b><a href="http://rinchoi.blogspot.com/2014/04/nvx-ex10s-not-average-substitute.html">Continued to General analysis</a></b><br />
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Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com13tag:blogger.com,1999:blog-7984778625978437479.post-47768320344557285852014-04-30T15:36:00.001-07:002014-04-30T15:59:45.865-07:00NVX EX10S: Not an average substitute<b><a href="http://rinchoi.blogspot.com/2014/04/nvx-ex10s-aesthetics.html">Continued from Aesthetics</a></b><br />
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It has been nearly a year since NVX introduce EX10S to the market. Although it has made its debut within the audiophile community already, not much is really known about its sound quality and true potential.<br />
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Besides, it is notable that EX10S shares many technical similarities with Vsonic GR07 mkII, which is one of my most favorite dynamic IEMs of all time. GR07 mkII is well-known for its great sound quality, inverted polarity, unique pivoting nozzle design, and usage of a flexible silver cable. If EX10S's sound quality turns out to be as good as that of GR07 mkII, the IEM shall be a great deal for the price.<br />
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<b>PRO: </b>Low distortion & good channel matching<br />
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<b>CON: </b>The absolute polarity is inverted.<br />
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<b>ON SECOND THOUGHT #1: </b>As expected, the difference between EX10S and GR07 mkII is very subtle. There's slight deviation in the treble, but it doesn't even exceed more than 6 dB. In addition, even the treble extension is identical. Considering the price difference between the two, EX10S has an incredible value.<br />
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<b>ON SECOND THOUGHT #2:</b> Just like GR07 mkII, unless inserted very shallow, EX10S retains linearity in the treble.<br />
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<b>ON SECOND THOUGHT #3</b>: While a piece of cloth may be inserted between the ear sleeve and the nozzle for acoustic damping, a piece of foam can be inserted into the nozzle as well, after removing the metal mesh.<br />
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<a href="http://3.bp.blogspot.com/-nkYfIvrO9oE/U1ebzTdRdTI/AAAAAAAAJ8Y/BomZ3Rs-S-c/s1600/vent.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/-nkYfIvrO9oE/U1ebzTdRdTI/AAAAAAAAJ8Y/BomZ3Rs-S-c/s1600/vent.jpg" height="289" width="640" /></a></div>
<b>ON SECOND THOUGHT #4:</b> Acoustic vents on EX10S work just like those on GR07 mkII. Once the vents are blocked, the sub-bass gets either boosted, or attenuated.<br />
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<b>ON SECOND THOUGHT #5:</b> EX10S may obtain better linearity in the upper end with the help of stock sleeves that come with T-PEOS H-100.<br />
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<b>ON SECOND THOUGHT #6: </b>Equip a pair of H-100 sleeves, and create a pinhole on each vents after completely sealing them off with a masking tape. The tonal balance is little dark, but the treble extends all the way up to 20 kHz.<br />
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<b>ON SECOND THOUGHT #7:</b> EX10S is quite off in the mid-range, when it is compensated with Dr. Olive's reference target.<br />
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<b>IN CONCLUSION:</b> As a new comer, NVX has made a kick off quite soundly. As such, EX10S is nearly half the price of GR07 mkII, but the sound quality is equivalent. If anybody, who likes the sound of Vsonic, is low on budget, I'd recommend NVX EX10S over anything, period.<br />
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<b>For more information on this product:</b><br />
<a href="http://www.nvx.com/ex10s.html">http://www.nvx.com/ex10s.html</a></div>
Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com33tag:blogger.com,1999:blog-7984778625978437479.post-72146236048194852492014-04-30T15:30:00.006-07:002014-04-30T15:37:34.792-07:00NVX XPT100: Aesthetics<div class="separator" style="clear: both; text-align: center;">
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<b>Introduction</b><br />
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Found in 2011 in Sherman Oaks, California, NVX is relatively a new player in the market. According to <a href="http://www.nvx.com/about-us">the website</a>, the company's primary goal is to maintain high product quality through technical innovation while educating consumers with essential facts. While NVX still remains largely unknown as a headphone manufacturer, as long as they stay true to their philosophy, a commercial success is inevitable.<br />
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<b>Packaging</b><br />
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Who says a good thing comes in small packages? XPT100 is bundled with a huge carrying case, 2 pairs of ComfortMax™ ear pads(standard + angled), and two detachable cables. Since most of "well-known" headphone manufacturers tend to reduce the number of bundled accessories in the product package to save production cost in these days, NVX's approach is the most welcomed.<br />
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<b>Housing design</b><br />
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The headphone is built to last. While the housing is rock-solid, there is absolutely no joint that makes a squeaking sound, crying for better built quality. Moreover, all of the parts can easily be disassembled and put back together within a minute, except the headband's foam part. In addition, there are two acoustic vents at the sides of the housing, which opens up a chance for modification.<br />
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<b>Ear pads</b><br />
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This is perhaps the most intriguing feature of XPT100. Not only the headphone comes with a pair of standard leatherette ear pads, it is also bundled with one pair of thick angled ear pads, just like those of Audeze LCD-2. These particular ear pads tilt the overall angle of the housing, and change sound radiation pattern, so that the sound wave is transmitted directly to the users' pinna in parallel. Since a good fit is crucial for studio monitoring, more fitting(ear pads, ear sleeves, etc) options are always better, period.<br />
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<b>Fitting mechanism</b><br />
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The size of the headband can be adjusted in nine steps with a tactile snap at each positions.<br />
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<b>Detachable cable(s)</b><br />
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On top of two pairs of ear pads, the headphone also comes with two detachable cables in two different lengths(1.5 m & 3.0 m).<br />
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<b><a href="http://rinchoi.blogspot.com/2014/04/nvx-xpt100-good-thing-comes-in-big.html">Continued to General analysis</a></b>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com7tag:blogger.com,1999:blog-7984778625978437479.post-66509604012408679902014-04-30T15:30:00.001-07:002014-04-30T15:41:30.040-07:00NVX XPT100: Good thing comes in big packages<b><a href="http://rinchoi.blogspot.com/2014/04/nvx-xpt100-aesthetics.html">Continued from Aesthetics</a></b><br />
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XPT100 is NVX's reference headphone, designed especially for studio monitoring. Not much has really been known about this product since its introduction in August of 2012. While the headphone certainly comes with a lot of accessories: a big case, 2 pairs of ear pads, and 2 cables, does it also come with a good sound quality?<br />
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<b>PRO:</b> Well-balanced linear tonality, low distortion, and a good extension in the treble & the low end.<br />
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<b>CON: </b>Slight dips at 300 Hz & 8 kHz.<br />
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<b>ON SECOND THOUGHT #1:</b> The angled ear pad definitely changes the tonality of XPT100. While the deep-null at 8 kHz is more emphasized, the overall tonality becomes a lot smoother. Users may choose between the two different sound signatures, but personally, I prefer the angled pads due to better fitting.<br />
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<b>ON SECOND THOUGHT #2:</b> Although two vents on the side of the housing equalizes the bass response, the foam inserted behind the driver(not shown on the graph) does not change the sound much, other than slightly damping the resonances in the mid-range.<br />
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<b>ON SECOND THOUGHT #3:</b> I am quite fascinated by the overall design of XTP100's front baffle, driver, and its ear pad coupling mechanism. While the appearance of the front baffle & the driver closely resembles that of Sennheiser HD650, the ear pads are connected to the baffle with a twist-and-lock, just like how AKG K702 is designed. There has definitely been an engineering effort of gathering the best of both worlds, and it actually pays off.<br />
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<b>ON SECOND THOUGHT #4:</b> Since when manufacturers start to remove internal damping materials from closed-back headphones? In order to save production cost, almost all of headphone companies decrease the quality of their products by getting rid of damping materials. On the other hand, XPT100's housing is filled with damping material, preventing any kind of unwanted cabinet resonance from occurring. I've never seen such care since Sony's classic MDR-series headphones.<br />
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<b>ON SECOND THOUGHT #5:</b> Angled ear pads yield slightly better linearity when it comes down to Dr. Sean Olive's reference target.<br />
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<b>IN CONCLUSION: </b>NVX XPT100 not only comes with a bunch of accessories, but also exhibits a good acoustic performance and an uncompromising built quality. Consequently, users are given with more options to choose, and may actively figure out their optimum sound which suits their needs. The people at NVX have kept their philosophy true to their heart, and their reference studio monitor, XPT100, proves it.<br />
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<b>For more information, please visit:</b><br />
<a href="http://www.nvx.com/xpt100.html">http://www.nvx.com/xpt100.html</a>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com18tag:blogger.com,1999:blog-7984778625978437479.post-68434067594637236592014-04-29T05:17:00.001-07:002014-04-30T15:38:26.607-07:00LEAR BD4.2: Aesthetics<br />
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<b>Introduction</b><br />
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Founded in 2008, LEAR is relatively a newcomer as an in-ear monitor manufacturer. Their company history is quite unique, because LEAR brand itself is from the mainland China, but is also fully owned & operated by an audio retailer called Forever Source Digital based in Hong Kong. According to <a href="http://lear.hk/about">the official statement</a>, the company is devoted to creating great aural experience through heavy R&D while offering reasonable price.<br />
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And BD4.2 is the ultimate result of their continuous effort, featuring quad balanced armature drivers and dual dynamic transducers coupled in a three-way crossover network, along with its metallic acoustic tubing, quad bore configuration, and an adjustable bass control. I guarantee you: There is absolutely no in-ear monitor quite like this one.<br />
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<b>Packaging</b><br />
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This particular unit is the universal version, LUF-BD4.2 The packaging itself is quite simple, and comes with three pairs of <b>bright</b>(single) sleeves, two pairs of <b>bass</b>(soft foam) sleeves, a pair of <b>reference</b>(tri-flange) sleeves, a pair of <b>balanced</b>(bi-flange) sleeves, and a pair of <b>neutral</b>(hard foam) sleeves. The stock carrying case is so sturdy; it comes extremely handy while on the go. There is also a screw driver used to control the bass control, a shirt clip, and a dust brush.<br />
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<b>The Unit</b><br />
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The beauty of BD4.2 comes from its deadly, alive, raw, yet mystical look. Due to the sheer number of components bound together within the unit, the IEM looks like a creature that might have came from the deep sea, where a <a href="http://en.wikipedia.org/wiki/Teuthowenia_pellucida">googly-eyed glass squid</a>, or a <a href="http://en.wikipedia.org/wiki/Channichthyidae">crocodile icefish</a>, which shows its internal organs through a transparent body, roams freely in total darkness, searching for food or perhaps a glimpse of light. Its intensively bold appearance shall gather attention from whomever sees it without asking his/her consent!<br />
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<b><a href="http://rinchoi.blogspot.com/2014/04/lear-bd42-next-generation-hybrid.html">Continued to General analysis</a></b>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com2tag:blogger.com,1999:blog-7984778625978437479.post-15619400073551813402014-04-29T05:16:00.004-07:002014-04-30T15:39:18.552-07:00LEAR BD4.2: The next-generation hybrid<b><a href="http://rinchoi.blogspot.com/2014/04/lear-bd42-aesthetics.html">Continued from Aesthetics</a></b><br />
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Exclusively designed by LEAR of Hong Kong, BD4.2 is claimed to feature ground-breaking innovations:<br />
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<i>1. Quad-bore configuration</i></div>
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<i>2. Metallic acoustic transfer tubing</i></div>
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<i>3. Adjustable bass control</i></div>
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<i>4. Acoustic low-pass filter</i></div>
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First, separate acoustic transfer tubes, or bores, help minimize the possible interference with sound waves coming from each drivers, while shaping their linear characteristics in specific manner to tailor-fit them to the manufacturer's requirement. As far as I know, no IEM manufacturer has ever tried quad bore, especially when even a 12-driver JH Audio Roxanne has only triple bores.<br />
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Second, metallic bores have previously been implemented by Suyama of Japan, and such tubes tend to have lower resonance frequency compared to the ones made of materials with lower density. Moreover, they also yield stable high frequency response due to the tube's constant geometry. The same logic may apply here with BD4.2 as well.<br />
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Third, although making the low frequency response fully adjustable may sound tempting, adding an extra adjustable module always increases the cost of development and production. Moreover, most of the bass control implemented in conventional IEMs are poorly designed, and lacks accuracy.<br />
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Fourth, other than Ultimate Ears UE900 and Shure SE846, and I've never witnessed such filter placed at the output of an IEM. It usually utilizes a long acoustic transfer tubing, and requires a good amount of calculation, not to mention precise engineering to be practically beneficial.<br />
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Consequently, the ultimate question is: Are all of the innovations claimed by LEAR true, and if so, is it possible that they work to the overall benefit of users?<br />
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<b>PRO: </b>Well-damped time domain characteristic especially in the low frequency region, where the effect of the acoustic low-pass filter dominates. Channel matching is superbly good too. The IEM's high modifiability is a huge plus.<br />
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<b>CON:</b> Inverted polarity, which can easily be corrected by swapping the cable's two-pin plug inversely.<br />
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<b>ON SECOND THOUGHT #1: </b>Custom version(LCM) users should be aware that the insertion depth and the projected frequency response of their units will be somewhere between those of the reference plane and 3 mm. Here's a good news though: Unless inserted extremely shallow, BD4.2's treble linearity is not affected by the insertion depth.<br />
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<b>ON SECOND THOUGHT #2:</b> Source impedance must remain below 1 Ω in order to retain the IEM's linear characteristic unless very specific tonal balance is desired. Otherwise, the output follows its own impedance characteristic as the source impedance increases, and the treble is attenuated accordingly. With added impedance of 33 Ω, the sensitivity at 10 kHz drops down about 8 dB relative to 100 Hz.<br />
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<b>ON SECOND THOUGHT #3:</b> As claimed by the manufacturer, all four bores are working independently covering their own frequency ranges. While upper metallic bores are dedicated to mid-range and treble, the bottom ones are woofers, working together to cover the frequency range below 400 Hz.<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
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<tr><td class="tr-caption" style="font-size: 13px;">The quad-bore shown on the right with the bass control on the left</td></tr>
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And this is where BD4.2 shines the brightest: The top two bores can actually be damped according to users' personal tastes by using a piece of foam only, and enable users to easily experiment with various tonal balances at their disposal.<br />
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<b>ON SECOND THOUGHT #4: </b>On top of highly modifiable bores, the bass can also be tuned with the adjustable bass control along with the rear housing vent. Surprisingly, the bass control is quite accurate, and boosts the frequency range below 1 kHz at the scale of whooping 24 dB(minimum to maximum) with extremely low Q-value.<br />
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<b>ON SECOND THOUGHT #5: </b>BD4.2 comes with five different types of ear sleeves, and each type has its own advantage. Please be advised that the stock sleeve used in this analysis is the single flange sleeve.<br />
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<b>ON SECOND THOUGHT #6: </b>Here are my recommendations. While the first one is strictly diffuse-field oriented with the treble extension limited to mimic the sound of Suyama's Fitear 334, the second recommendation sounds very close to Sennheiser IE800 with the mid-high response enhanced.<br />
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Recommendation 1: First of all, equip a pair of Sony MH1 sleeves(Sony hybrids, Phonak stock, or Shure EA510) to finely shape the treble response above 10 kHz. Second, minimize the bass control. Third, insert a piece of earbud foam(0.5 mm x 0.5 mm x 0.5 mm) to the right upper metal bore. Fourth, couple the IEM with a 33 Ω resistor in serial. This setting is recommended when a source device with high output impedance is used to drive the IEM.<br />
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Recommendation 2: First of all equip a pair of Sony MH1 sleeves(Sony hybrids, Phonak stock, or Shure EA510) to finely shape the treble response above 10 kHz. Second, leave the bass control at stock position. Third, insert a piece of earbud foam(0.5 mm x 0.5 mm x 0.5 mm) to the right upper metal bore. The source impedance shall remain below 1 Ω.<br />
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<b>ON SECOND THOUGHT #7:</b> The IEM in stock configuration is slightly bright in the mid-high range when compensated with Harman International's reference target.<br />
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<b>IN CONLUSION: </b>LEAR BD4.2 is unlike anything I've ever measured so far. Yes, the claims made by the manufacturer turn out to be all true, and the accumulated effects from the innovations add up to the benefit of users.<br />
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The stock configuration presented by LEAR is superb too, but the fact that the sound signature can be finely adjusted without having to modify the IEM's internal components shall be praised & glorified the most. There are simply endless possibilities for users to discover by means of both simple acoustical & electrical tweaks. And because of that, I acknowledge BD4.2 as one of the IEMs with highest quality of all, and one of my most favorite headphones as well.<br />
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<b>More information on this product: </b><br />
<a href="http://lear.hk/products/All/LUF_BD4_2/52">http://lear.hk/products/All/LUF_BD4_2/52</a>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com16tag:blogger.com,1999:blog-7984778625978437479.post-51055228748375004222014-04-26T00:47:00.003-07:002014-04-26T21:05:24.042-07:00Astrotec AX35: Hybrid just got affordable<br />
Previously, Astrotec's flagship hybrid model, AX60, turns out to be quite a disappointment. Not only its sound signature is nowhere close to that of AKG K3003, which is claimed reference target of the IEM, but also the sound quality itself is simply not up to the standard set by other Chinese manufacturers, such as Unique Melody or Vsonic.<br />
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Meanwhile, AX35 is Astrotec's low-end hybrid, featuring a ⌀10 mm dynamic woofer and a balanced armature tweeter. There is nothing too fancy about AX35: The filter is not replaceable, and only one pair of normal size sleeves come with the IEM. What can possibly be expected from such normalcy?<br />
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<b>PRO: </b>Sturdy built-quality, well-matched channel balance, low distortion, and intuitive acoustic damping design. Time domain characteristic is excellent too.</div>
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<b>CON:</b> Short bandwidth & the acoustic damping design in stock configuration loses a lot of sub-bass response.</div>
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<b>ON SECOND THOUGHT #1:</b> Since the frequency bandwidth is short as is, insertion depth doesn't play much of a role in terms of treble extension.</div>
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<b>ON SECOND THOUGHT #2:</b> Due to the IEM's impedance characteristic, additional resistance boosts the treble slightly.</div>
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<b>ON SECOND THOUGHT #3:</b> Users may choose to remove the stock metal mesh + white cloth filter placed on the nozzle, and replace it with one of the acoustic dampers designed for hearing aids. This increases the mid-range sensitivity tremendously.</div>
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<b>ON SECOND THOUGHT #4: </b>Depending on how these vents are configured, AX35 may become one of the best sounding hybrids in the market. While the front vent attenuates the sub-bass response, the rear vent does the exact opposite to counter balance what's lost. Users must be aware exactly what they are trying to achieve before executing any type of modification on acoustic vents.</div>
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<b>ON SECOND THOUGHT #5:</b> Recommendation 1: First of all, equip a 100 Ω resistor to the IEM, and a pair of Sony MH1 sleeves(Sony hybrids, Phonak stock, or Shure EA510). Second, seal off all vents. Third, remove all of the stock dampers placed on the nozzle, and replace them with a 680 Ω white damper. Fourth, equip the metal mesh back for safety if possible.</div>
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Recommendation 2: First of all, equip a 100 Ω resistor to the IEM, and a pair of Sony MH1 sleeves(Sony hybrids, Phonak stock, or Shure EA510). Second, seal off all vents but puncture a smaller hole in the rear. Third, insert the IEM into the ear canal as deep as possible. Now AX35 sounds like Sony's EX-series.</div>
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<b>ON SECOND THOUGHT #6:</b> Except with the emphasis in the mid-low range, AX35's tonal signature matches the Olive-Welti reference quite well.</div>
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<b>IN CONCLUSION:</b> With high affordability, solid built quality, and robust acoustic damping design, Astrotec AX35 is truly the hybrid of the next level. The IEM easily outperforms the flagship model, AX60, in every possible aspect. Although the stock configuration lacks "the fine touch" to be considered as of a high-end product, users may still retweak the sound as they wish, and simply fill up what they think it is lacking. AX35 has a great value, and I can highly recommend it to anybody who is on low budget, but still wants good sound. Do I like it? You bet.</div>
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<b>More information on this product: </b></div>
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<a href="http://www.astrotec.cn/product.asp?id=15">http://www.astrotec.cn/product.asp?id=15</a></div>
Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com8tag:blogger.com,1999:blog-7984778625978437479.post-37994117109902620952014-04-24T03:38:00.003-07:002014-04-25T04:34:09.138-07:00Ultimate Ears UE900: Take two<br />
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Since my review in 2012, there has been a rumor that Logitech have tinkered the internal configuration of UE900, thus nullifying <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-part3-in-depth-analysis.html">the result of my analysis</a>. In order to figure out what the hell is going on with Logitech, I bought a brand new pair of UE900 at my own expense.<br />
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PRO: <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-ue900-general-analysis.html">Please refer to my previous analysis in 2012.</a><br />
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CON: <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-ue900-general-analysis.html">Please refer to my previous analysis in 2012.</a><br />
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<b>ON SECOND THOUGHT #1: </b>Yes, UE900 from 2014 outputs a lot more mid to high range response compared to the 2012 one.<br />
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While such change does slightly better treble in stock configuration, it has a drastic impact on my <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-part3-in-depth-analysis.html">"recommendation"</a>. No, UE900 with a 100 ohm resistor doesn't sound as linear as it used to be.<br />
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<b>ON SECOND THOUGHT #2:</b> As far as insertion depth goes, <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-ue900-general-analysis.html">please refer to my previous analysis in 2012.</a><br />
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<b>ON SECOND THOUGHT #3:</b> While everything else remains the same as <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-part3-in-depth-analysis.html">the 2012 analysis</a>, the resonance at 8 kHz(λ/4 resonance of the tweeter) is heavily emphasized with added resistance. The treble response is not at linear, and requires extra amount of effort to tone the peak down.<br />
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<b>ON SECOND THOUGHT #4: </b>Even with different kind of acoustic dampers, the problematic resonance still persists. And please note that UE900's stock damper is located in the middle of the bore, so extra care is required when removing it. (If your UE900 comes with a pair of white dampers, you should definitely have a real problem with the annoying peak at 8 kHz as can be seen <a href="http://1.bp.blogspot.com/-Jr0PpURChso/U1jseW0CMQI/AAAAAAAAJ_U/O4K5HtWWOQ0/s1600/white.png">here</a>)<br />
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<b>ON SECOND THOGHT #5: </b>As far as the working principle of the pinhole bore goes, <a href="http://rinchoi.blogspot.com/2012/10/ultimate-ears-ue900-general-analysis.html">please refer to my previous analysis in 2012.</a><br />
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<b>ON SECOND THOUGHT #6:</b> Since the previous modification method doesn't work anymore, here's something different: First, block the pinhole bore and puncture a smaller hole with a needle. Second, remove the stock damper, insert a piece of earbud foam(1 mm X 1 mm X 1 mm) to the far end of the bore, and equip a 2200 Ω red damper(the stock damper may be reused) on top of the foam. Make sure the red damper is situated in the middle(stock location) of the bore. Finally, a pair of Sony MH1 sleeves(also compatible with Sony hybrids / Phonak stock / Shure EA510) are needed to fine-shape the frequency response above 10 kHz.<br />
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Users may add extra resistance, perhaps a 33 Ω resistor, to further make the sound flatter. This time, UE900's reference target is Sony MDR-EX1000 without the peak at 5.5 kHz, but with extended treble, and the result is stunningly good.<br />
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<b>ON SECOND THOUGHT #7:</b> While in stock configuration, UE900 of 2014 doesn't even closely match any reference targets.<br />
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<b>IN CONCLUSION:</b> This is headphone modders' worst nightmare come true, and I have absolutely no clue why Logitech have made such decision. UE900 can still be nicely tuned, but it turns out to be way more difficult than how it used to be.Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com9tag:blogger.com,1999:blog-7984778625978437479.post-10077630423225955662014-03-19T16:43:00.004-07:002014-04-30T15:38:36.841-07:00NuForce Primo 8: Aesthetics<br />
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<b>Introduction</b><br />
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Since its establishment in 2005, NuForce of USA has been building a great reputation as an audiophile equipment manufacturer by offering a wide range of products, from a high-end Class-D amplifier to a small portable speaker. And in March of 2014, order to accommodate the specific needs of the audiophiles who rather prefer portability, the Californian company finally launches its first multi-balanced armature transducer driven IEM, Primo 8.<br />
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Not to mention its quad-driver configuration, according to the manufacturer, Primo 8 comes with two key innovations: A special patent-pending cross-over network design, which offers phase coherence throughout the frequency spectrum, and a multi-layered star shaped Litz cable joined with a MMCX connector.<br />
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<b>Packaging</b><br />
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Primo 8 comes with a good amount of accessories, including a carrying case, an airplane adapter, a 1/4' plug, and ear sleeves with different sizes.<br />
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<b>The Unit</b><br />
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Aesthetics wise, there really isn't a room to complain. Although the MMCX connection should come very handy for audio cable enthusiasts, I still do feel like the joint could have been little tighter to prevent durability issue, which is a common problem for these particular connectors.<br />
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<b><a href="http://rinchoi.blogspot.com/2014/03/nuforce-primo-8-firstborn.html">Continued to General analysis</a></b>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com4tag:blogger.com,1999:blog-7984778625978437479.post-9955348856209760402014-03-19T16:42:00.003-07:002014-03-20T14:46:40.238-07:00NuForce Primo 8: The firstborn<div style="text-align: center;">
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<b><a href="http://rinchoi.blogspot.com/2014/03/nuforce-primo8-part-1-aesthetics.html">Continued from Aesthetics</a></b></div>
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<i><br /></i><i>Disclaimer: Data presented here have been acquired with a pair of stock silicone sleeves inserted at 3mm away from the reference plane of the occluded ear simulator, unless stated otherwise.</i></div>
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Primo 8 is the very first quad-driver in ear monitor from an American audio manufacturer, NuForce. While NuForce's technological expertise have been verified repeatedly with their high quality Class-D amplifiers, their reputation as a headphone/IEM company still seems to be quite equivocal to enthuasists. Consequently, this first born child shall serve as a showcase of what the manufacturer is capable of.<br />
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<b>PRO:</b> Excellent channel-matching, low distortion, and properly aligned polarity.<br />
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<b>CON:</b> Dampers are not exchangeable. With the stock silicone sleeves, there is a risk of bandwidth cut-off above 10 kHz due to the IEM's high acoustic output impedance. Using a stock Comply sleeves, which have a tapered bore, should solve the issue.<br />
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<b>ON SECOND THOUGHT #1:</b> As stated by the manufacturer, unlike other quad-driver IEMs, such as Shure SE846, Ultimate Ears UE900, or Westone 4, Primo8's phase response is quite linear. Whether the audibility of such phase anomaly is <a href="http://www.audioholics.com/room-acoustics/human-hearing-phase-distortion-audibility-part-2">still very questionable</a>, it can at least safely be assumed that the quad-drivers inside of Primo 8 are behaving more in unity in terms of time-domain than its competitors, thus offering more natural sound. By coupling a pair of pre-packaged dual balanced armature drivers, NuForce is able to minimize any complications in the crossover network design while distributing an sufficient number of drivers throughout the frequency spectrum.<br />
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<tr><td class="tr-caption" style="font-size: 13px;">NuForce's proprietary phase-coherent crossover technology</td></tr>
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Although Primo 8's phase coherent technology helps solve the phase-related problems, there is still a bit of pre-ringing present; Since physical phase-shift compensation(wavelength offset) is virtually impossible for woofer drivers within a small housing unit, such overlapping of time alignment is inevitable for any multi-driver IEMs.<br />
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<b>ON SECOND THOUGHT #2:</b> Securing a deep fit is vital for this IEM for securing both frequency response linearity and treble extension. When inserted shallow, the peak at 7 kHz, which is possibly caused by the quarter-wavelength resonance of the IEM, joins the second wavelength resonance of the ear canal, causing harshness.<br />
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<b>ON SECOND THOUGHT #3:</b> Ideally, Primo 8 requires a source device with output impedance less than 1 Ω due to how its impedance characteristic is shaped. With a source impedance of 33 Ω, the output at 10 kHz is attenuated about -11 dBSPL relative to that of 1 kHz. Even with 10 Ω, Primo 8 loses about -6 dB at 10 kHz relative to 1 kHz. <u>However, it is important to note this fact:</u> Since almost all of the smartphones and digital audio players currently available in the market have very low output impedance, only at few ohm values, such impedance interaction shall not affect portability of the IEM itself in practice.<br />
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<b>ON SECOND THOUGHT #4:</b> Unfortunately, altering acoustic damping design of the IEM is not possible as the stock dampers are not exchangeable. Instead, acoustic resistive materials may be inserted between the nozzle and the ear sleeve for DIY modification.<br />
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<b>ON SECOND THOUGHT #5: </b>As stated above, Primo 8 becomes a lot more linear in the treble simply by equipping a pair of stock Comply(T-100) sleeves, or any other ear sleeves that has a smooth tapering at the tip of the bore.<br />
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<b>ON SECOND THOUGHT #6: </b>Even though Primo 8's frequency response doesn't quite fit to the conventional diffuse-field reference, according to <a href="http://www.aes.org/e-lib/browse.cfm?elib=17042">the new in-room headphone response target of Dr. Sean Olive of Harman International</a>, Primo 8 is doing extremely well except for a little dip below 100 Hz.<br />
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<a href="http://1.bp.blogspot.com/-Q6FwCIw7c-Q/UyloQ2CTIcI/AAAAAAAAJlA/9cq5__GJSZA/s1600/IMG_4174.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-Q6FwCIw7c-Q/UyloQ2CTIcI/AAAAAAAAJlA/9cq5__GJSZA/s1600/IMG_4174.jpg" height="400" width="266" /></a></div>
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<b>IN CONCLUSION: </b>NuForce Primo 8 is a solid product with an unique tonal quality, which enables the IEM to compete among other the other top contenders in the market. Of course, just like any other consumer products, Primo 8 isn't without its flaw especially with the impedance characteristic and insertion depth-related issues. Yet, in terms of electroacoustic performance, Primo 8 owns its quad-driver competitors when compared in stock configuration with an insertion depth at 3 mm away from the reference plane. A lot of research effort has been put into the development of this firstborn, and is definitely paying off.<br />
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<b>For more information, please visit:</b><br />
<a href="https://www.nuforce.com/index.php?option=com_k2&view=itemlist&layout=category&task=category&id=86&Itemid=885">https://www.nuforce.com/index.php?option=com_k2&view=itemlist&layout=category&task=category&id=86&Itemid=885</a>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com8tag:blogger.com,1999:blog-7984778625978437479.post-49095774505215623892014-02-24T14:20:00.001-08:002014-02-24T14:30:13.594-08:00Creative Aurvana Live! 2: Aesthetics<div class="separator" style="clear: both; text-align: center;">
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<br />
<b>Introduction</b><br />
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As a successor of Aurvana Live!, which has been known for its great value, Creative introduce Aurvana Live! 2 in late 2013.<br />
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<a name='more'></a><br /><br />
<b>Packaging</b><br />
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<b>Housing design</b><br />
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<b>Ear pads</b><br />
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Due to how human ears are shaped, although it is slightly bigger in size, Live! 2's circular ear pads(and the front baffle) are not as fitting as those come with the original Live!.<br />
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<b>Fitting mechanism</b><br />
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The headband can be enlarged by up to ten steps.<br />
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<b>Detachable cable</b><br />
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<b><br /></b>
A detachable cable is always welcomed, as users virtually become free of durability issues occuring at the strain relief. Aurvana Live! 2's cable comes with a media control module as well to be used along with a smartphone.<br />
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<b><a href="http://rinchoi.blogspot.com/2014/02/creative-aurvana-live-2-general-analysis.html">Continued to General analysis.</a></b>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com1tag:blogger.com,1999:blog-7984778625978437479.post-58693378478495837112014-02-24T01:45:00.003-08:002014-02-24T14:20:52.057-08:00Creative Aurvana Live! 2: General analysis<div class="separator" style="clear: both; text-align: center;">
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Previously, <a href="http://rinchoi.blogspot.com/2013/08/creative-aurvana-live.html">Creative Aurvana Live!</a> has shown its strength in high cost-performance ratio, thanks to the pair of unique bio-cellulose drivers manufactured by Foster of Japan. Despite its high level of distortion, Live!'s frequency response turns out to be very linear, surpassing most of its competitors at higher price range.<br />
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And in 2013, its successor, Aurvana Live! 2 makes its debut, featuring a slightly higher sensitivity (+2dB/mW) than the original.<br />
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<a name='more'></a><br />
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<b>PRO: </b>Live! 2's frequency response is quite linear, though not as linear as the original Live!. Since the fit is not as tight as the original, there is much chance for the placement induced amplitude deviation to be involved.<br />
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<b>CON: </b>Again, just like its predecessor, this headphone also exhibits a good amount of distortion in the low frequency range below 100 Hz, especially with <u>a lot of odd-order harmonic components</u>.<br />
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<a href="http://4.bp.blogspot.com/-wo8iA1EVI0g/UwsW5PMN_EI/AAAAAAAAJNA/V7o6o6p9mzQ/s1600/comp.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-wo8iA1EVI0g/UwsW5PMN_EI/AAAAAAAAJNA/V7o6o6p9mzQ/s1600/comp.jpg" /></a></div>
<b>ON SECOND THOUGHT #1:</b> When compared side by side, it is clear that Live! 2 doesn't live up to the name of its predecessor.<br />
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<b>ON SECOND THOUGHT #2: </b>Against the reference of Dr. Sean Olive, Creative Aurvana Live! 2 actually performs worse than the original Live!. There is too much sibilant in the treble & emphasis in the mid-bass.Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com2tag:blogger.com,1999:blog-7984778625978437479.post-72116713515967487692014-02-22T21:52:00.000-08:002014-02-24T02:08:15.538-08:00The effect of break-in: Creative Aurvana Live! 2<div style="text-align: center;">
<i>Disclaimer: Most of the graphs listed here are animated GIF images.</i></div>
<b><br /></b>
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<b>Introduction</b><br />
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It is generally known that a new pair of headphones must go through a "warming up(aka break-in)" phase for a certain period of time before it opens up its true sonic potential. Previously, both electroacoustic and psychoacoustic aspects of a 100 hours-long headphone break-in have been presented with SONY MDR-EX1000(electrodynamic microtransducer), Sennheiser HD650(Full-sized electrodynamic), Fostex T50RP(isodynamic), and VSonic VC02(smallest microtransducer) The physical transformation is evident in all cases, yet its degree is not of a night and day difference, as audiophiles normally describe it.<br />
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<a name='more'></a><br />
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Creative Aurnava Live! 2 is equipped with a pair of Foster's bio-celluclose drivers with a separated surround made of urethane. According to Akihiko Hosaka, the senior manager at Samsung electronics Inc., who developed Samsung YA-EF310,<br />
<blockquote class="tr_bq">
<i> "The diaphragm of a headphone available in the current market is mostly made out of a polymer film. In this case, since this type of headphone doesn't need a separate damping mechanism (such as a spider / suspension of a loudspeaker) implemented, I am quite certain breaking it in would have no effect at all.</i></blockquote>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="http://4.bp.blogspot.com/-wDYQDLNu0Hw/T4JrZzJzpuI/AAAAAAAAAac/j9OX1yTwg5g/s1600/hosaka.bmp" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://4.bp.blogspot.com/-wDYQDLNu0Hw/T4JrZzJzpuI/AAAAAAAAAac/j9OX1yTwg5g/s1600/hosaka.bmp" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><a href="http://desk.mywork.co.kr/zboard/zboard.php?id=technical&no=57">http://desk.mywork.co.kr/zboard/zboard.php?id=technical&no=57</a></td></tr>
</tbody></table>
<blockquote class="tr_bq">
<i>However, manufacturers sometimes utilize a separate damper, which is made out of either rubber/urethane-related materials, to the driver of their high-end models. As this separate damper works, just like with a loudspeaker, above the glass transition temperature, its physical property might change slightly as a result of breaking-in. Should a break-in occur, it must be related to something happening at the resonant frequency."</i></blockquote>
And since Foster's BC driver is made in such way, Mr. Hosaka's statement shall be relevant to the topic more or less.<br />
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<b>Procedure</b><br />
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A brand-new Creative Aurvana Live! 2 is to be broken-in for 100 hours straight with XLO's break-in sample (100 dB SPL @ peak), driven with an Objective 2 headphone amplifier. Once the headphone is placed on HATS, its physical placement must remain untouched for the next 100 hours in order to prevent any placement-related deviations. In addition, in order to eliminate any unwanted effects derived from sources other that the driver itself, a special jig is created so that the cushion is free of mechanical settling during the break-in phase. And the temperature must stay within ±1°C when measurement is carried out. Each 10 times averaged pre break-in & post break-in measurement data are to be compared, and should any type of change occur, they are to be reproduced back utilizing a binaural recording technique to be ABX-compared.<br />
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<b>Temperature check</b><br />
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<b>Objective Assessment</b><br />
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Impedance</div>
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Overall impedance is slightly decreased after the break-in.<br />
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<div style="text-align: center;">
Frequency response</div>
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While the left driver exhibits increased sensitivity (>1dB) in an even manner throughout the entire frequency spectrum, the right driver shows change mostly in the low-mid frequency range, at which resonances are present.<br />
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<div style="text-align: center;">
Phase response</div>
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Harmonic distortion</div>
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Again, there is more discernible difference shown on the right driver. The distortion level on the left driver remains largely unchanged even after 100 hours of break-in.<br />
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<br />
<b>Time-domain characteristics </b><br />
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<div style="text-align: center;">
Impulse</div>
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<div style="text-align: center;">
CSD</div>
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<div style="text-align: center;">
ETC</div>
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<div style="text-align: center;">
Group delay</div>
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<br />
<b>Subjective Assessment</b><br />
<br />
ATTENTION: In order to accurately reproduce these binaural samples, listeners must use a flat diffuse-field equalized headphone, such as Etymotic Research ER-4B or STAX Lambda PRO with ED-1. Otherwise, samples can still be compared relatively, but the accuracy of the reproduced result can not be guaranteed. The reference sample is an excerpt from the free hi-resolution sample provided by 2L - the Nordic sound. It is highly recommended to download below samples for critical listening experience.<br />
<br />
<br />
<b>Reference sample @ 24-bit / 96 kHz</b><br />
<iframe frameborder="no" height="166" scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/76664858&color=ff5500&auto_play=false&hide_related=false&show_artwork=true" width="100%"></iframe>
<b><br /></b>
<b><br /></b>
<b>Brand new Creative Aurvana Live! 2 </b><br />
<iframe frameborder="no" height="166" scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/136272301&color=ff5500&auto_play=false&hide_related=false&show_artwork=true" width="100%"></iframe>
<b><br /></b>
<b><br /></b>
<b>Post 100 hour broken-in Live! 2</b><br />
<iframe frameborder="no" height="166" scrolling="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/136272302&color=ff5500&auto_play=false&hide_related=false&show_artwork=true" width="100%"></iframe>
<b><br /></b>
<b><br /></b><br />
<b><br /></b>
<br />
<b>Conclusion</b><br />
<br />
As previously confirmed by others, <a href="http://www.geocities.jp/mister_terch/zakki05aging.html">1</a> <a href="http://fuchinove.ninja-mania.jp/AGING2008.html">2</a> <a href="http://fuchinove.ninja-mania.jp/aging900stdriver.html">3</a> <a href="http://www.innerfidelity.com/content/evidence-headphone-break">4</a> <a href="http://www.innerfidelity.com/content/break-part-deux">5</a> <a href="http://www.innerfidelity.com/content/measurement-and-audibility-headphone-break">6</a>, and by myself, <a href="http://rinchoi.blogspot.com/2012/04/effect-of-break-in-sony-mdr-ex1000.html">1</a> <a href="http://rinchoi.blogspot.com/2012/04/introduction-it-is-generally-known-that.html">2</a> <a href="http://rinchoi.blogspot.com/2013/01/the-effect-of-break-in-vsonic-vc02.html">3</a> , the physical effect of break-in is quite evident. However, it is questionable whether drivers with separate damping mechanism tend to be more affected as suggested by Mr. Hosaka of Samsung Electronics. Moreover, psychoacoustic aspect of Creative Aurvana Live! 2's break-in has been demonstrated for ABX comparison so that listeners could verify the audibility of 100 hours of what-so-called 'warming-up'.Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com4tag:blogger.com,1999:blog-7984778625978437479.post-13654966695747744222014-02-22T15:56:00.002-08:002014-05-17T02:57:15.077-07:00STAX ED-1 Monitor: A legacy from the past<div style="text-align: center;">
<i>Disclaimer: I can finally give a proper introduction to this classic masterpiece, thanks to my good friend, vAsurada, who resides in South Korea. This article would have never been publicized had he not given me permission to do so.</i></div>
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<br />
<b>Introduction</b><br />
<br />
As previously mentioned, STAX's ED-1 Monitor is a proprietary equalizer module specially designed for their SR-Λ Pro. With the help of the module, the headphone is effectively turned into the most accurate diffuse-field simulator ever created in the history of headphones.<br />
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<a name='more'></a><br />
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ED-1's creation goes way back. In 1985, Dr. Günther Theile of IRT(Institut fur Rundfunktechnik) comes up with a revolutionary idea that challenges the common notion of free-field equalization, and thus changes the history of headphones forever. By assessing the data acquired physically, such as by using actual human ears, he argues that the localization characteristic of headphones is close to that of a diffuse-field, rather than that of a free-field.<br />
<br />
Theile explains the functional goal of a diffuse-field reference in his IRT article:<br />
<blockquote class="tr_bq">
<i>"various quality assessment tests have confirmed that a flat diffuse-field sensitivity curve of a headphone is a guarantee of optimum sound neutrality. Headphones with exact IRT equalization are now being manufactured by various companies."</i></blockquote>
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In collaboration with Dr. Theile of IRT, STAX starts to work on optimizing the sound quality of their products. And at last, in 1988, ED-1 Monitor is introduced at the price of ¥70,000 along with an amplifier-coupled version, SRM-Monitor.<br />
<br />
This is what the manufacturer, STAX, has to say about the equalizer:<br />
<blockquote class="tr_bq">
<i>"The ED-1 equalizer began as a project for Munich's Institute of Broadcast Technique, to fulfill the demand for an SR-Lambda Pro capable of monitoring binaural radio plays and delivering diffuse-field response for experiments. Measuring headphone frequency response meaningfully has proved difficult; this new approach, involving the insertion of probe microphones into the ear canals of different human subjects, produces data which correlates better with what one actually hears than did the old free-field tests. Simply put, the goal is to achieve flat response at the eardrum, not at the entrance to the ear. The ED-1 can be switched into and out of the signal path from the front panel, so its effect is easy to judge."</i></blockquote>
Although the equalizer is a proprietary design for SR-Λ Pro, almost all of STAX's headphones are well compatible with the module too. Here is the list of the ED-1 compatible models that have been previously analyzed on this blog: <a href="http://rinchoi.blogspot.com/2013/08/stax-sr-003-mk1-electrostatic-in-ear.html">SR-003</a>, <a href="http://rinchoi.blogspot.com/2013/08/stax-sr-207-back-to-basic.html">SR-207</a>, SR-Λ <a href="http://rinchoi.blogspot.com/2013/06/stax-sr-lambda-professional-history.html">Pro</a>/<a href="http://rinchoi.blogspot.com/2013/07/stax-sr-lambda-signature-legend-revised.html">Signature</a>/Nova Basic, and SR-009.<br />
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<br />
<b>Frequency response & Phase</b><br />
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Thanks to STAX's labor-intensive manual calibration, channel matching is nearly perfect. The overall precut is about 2 dB down, which is quite a conservative approach for such application.<br />
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<br />
<b>Time Domain</b><br />
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The absolute polarity is inverted with the equalizer. STAX users must pay attention to this detail as SR-Λ Pro is one of the few headphones from STAX with aligned polarity.<br />
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<br />
<b>Distortion</b><br />
<b><br /></b>
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<div style="text-align: center;">
THD</div>
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<div style="text-align: center;">
SMPTE IMD(60Hz, 7kHz / 1:4): 0.0024% (relative)</div>
<div style="text-align: center;">
THD+N(A): 0.0013% (relative)</div>
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Clearly, the amount of distortion ED-1 introduces to the entire playback chain is negligible.<br />
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<a href="http://2.bp.blogspot.com/-okAylvHfk9g/Uwk0ylO3AUI/AAAAAAAAJJk/S0O6NGZGCAI/s1600/2014-02-22+15.32.00.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-okAylvHfk9g/Uwk0ylO3AUI/AAAAAAAAJJk/S0O6NGZGCAI/s1600/2014-02-22+15.32.00.jpg" height="300" width="400" /></a></div>
<br />
<b>Conclusion</b><br />
<br />
It seems that the idea of utilizing a perfect diffuse-field target is now abandoned, and as a new trend, more manufacturers are incorporating a negatively sloped diffuse-field target. In addition, by investigating the listener preference among headphone users, headphone acoustics will keep advancing forward, further distancing itself away from the principle that STAX have once sought with their ED-1.<br />
<br />
However, STAX must be glorified as no other headphone manufacturers have ever created a proprietary equalizer of such quality solely to optimize the sound itself. The legacy ED-1 bears is timeless, and the effort the engineers have devoted in designing the module shall be remembered forever.<br />
<br />
<br />
<b>References</b><br />
<br />
G. Theile, "The Importance of Diffuse-field Equalization for Stereophonic Recording and Reproduction," 13. Tonmeistertagung München, 1984.<br />
<br />
STAX. Fifty Years of Excellence. 940 East Dominguez St., Carson, CA 90746: STAX, 1988. Print.Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com2tag:blogger.com,1999:blog-7984778625978437479.post-12653090838258341972014-02-15T11:28:00.001-08:002014-04-23T02:26:29.128-07:00Sony SBH80 Part.1: Aesthetics [Updated on 4/23/2014]<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-6sIk4JkLYD4/Uv7WI_cqaxI/AAAAAAAAJDQ/h9___Df4mok/s1600/IMG_40171.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/-6sIk4JkLYD4/Uv7WI_cqaxI/AAAAAAAAJDQ/h9___Df4mok/s1600/IMG_40171.jpg" height="266" width="400" /></a></div>
<br />
<b>Introduction</b><br />
<br />
On January 6th at CES 2014, Sony starts a new project called <i>New</i> <i>Smartwear Experience Vision</i>, which revolves around ultimate portability accomplished by seamless connection through wearable technology. Several devices that share the unified theme have been introduced, including SmartBand and SmartWatch 2. And also, as a part of the project, a new Bluetooth stereo headset, SBH80, is announced.<br />
<br />
From the audio designer of MH1 LiveSound™ Hi-Fi headset, <i>Sead Smailagic</i> of Sony Mobile, comes a next-generation wireless audio experience.<br />
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<a name='more'></a><br />
<b>The Unit</b><br />
<b><br /></b>
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<a href="http://3.bp.blogspot.com/-lGP2T4q4MN0/Uv7WX-5PYII/AAAAAAAAJDk/HRC0GlmRe4U/s1600/IMG_40391.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/-lGP2T4q4MN0/Uv7WX-5PYII/AAAAAAAAJDk/HRC0GlmRe4U/s1600/IMG_40391.jpg" height="266" width="400" /></a></div>
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<br />
Upon brief look, Sony SBH80 seems to closely resemble MH1's design. However, Unlike MH1, which is made of aluminium, SBH80's housing consists of a heavier dual-layered magnesium alloy. This improvement certainly makes the headphone more sleek and highly durable. And with its newly designed ear sleeves, a tighter fit is well secured.<br />
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<b><br /></b><b>The Bluetooth module</b><br />
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-49-Kb3kDXGg/Uv7VYKRDqQI/AAAAAAAAJC4/zgwZTlWrO7w/s1600/IMG_40251.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/-49-Kb3kDXGg/Uv7VYKRDqQI/AAAAAAAAJC4/zgwZTlWrO7w/s1600/IMG_40251.jpg" height="266" width="400" /></a></div>
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<a href="http://3.bp.blogspot.com/-0HAkANEEwh4/Uv7VYNwFx0I/AAAAAAAAJC8/12HLrNugxU8/s1600/IMG_40601.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://3.bp.blogspot.com/-0HAkANEEwh4/Uv7VYNwFx0I/AAAAAAAAJC8/12HLrNugxU8/s1600/IMG_40601.jpg" height="266" width="400" /></a></div>
<br />
Not to mention its cool appearance, as SBH80's Bluetooth module is designed in such way that the weight of the module is evenly distributed not to the ears, but to the shoulder, yielding better comfort than most of its competitors. Even in extended usage, the headset is virtually fatigue-free.<br />
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<br />
<b>Sead Smailagic, the tonmeister</b><br />
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td><a href="http://2.bp.blogspot.com/-y5YBkOT4wMM/Uv7g4DFHMDI/AAAAAAAAJEM/BueKg63nhnQ/s1600/image006.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://2.bp.blogspot.com/-y5YBkOT4wMM/Uv7g4DFHMDI/AAAAAAAAJEM/BueKg63nhnQ/s1600/image006.jpg" height="224" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="font-size: 13px;">Sead Smailagic at a recording studio in New York, NY</td></tr>
</tbody></table>
Mr. Smailagic's devotion to reproducing accurate sound is unprecedented. From applying the core principles of psychoacoustics to using one of the well-known recording studios in New York for fine-tuning the sound, he has carefully taken many steps to optimize the overall quality of the headset. Moreover, unlike other manufacturers that simply use generic third party materials, he actually takes care of the smallest details when it comes down to engineering to make sure the product is perfectly up to his standard:<br />
<blockquote class="tr_bq">
<i>"... the very detailed specification on the driver, like VC material, VC diameter, VC length (nr of turns), VC gap in the magnet, Diaphragm material, thickness, shape of the dome, etc ..."</i></blockquote>
Such quality has been proven true previously with his MH1. So, as his newest creation, SBH80, is engineered to have even better tonal balance and clarity, the hope is high.<br />
<br />
<br />
<b>Updated on 4/23/2014:</b> According to Sony Mobile, SBH80 is specifically tuned to match the linear characteristic of the musical imperiario, L.A. Reid's recording studio.<br />
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="http://2.bp.blogspot.com/-oMXjSX3yBSc/U1eEqClL3EI/AAAAAAAAJ54/v5RGX_03yuY/s1600/image0101.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://2.bp.blogspot.com/-oMXjSX3yBSc/U1eEqClL3EI/AAAAAAAAJ54/v5RGX_03yuY/s1600/image0101.png" height="236" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Mr. Reid listening to SBH80 at his studio</td></tr>
</tbody></table>
This has been made in conjunction with the release of the late king of pop, Michael Jackson's new single, <i>Slave to the Rhythm</i>.<br />
<blockquote class="tr_bq">
<i>The tuning settings have also been burnt to the digital signal processor on the optional Bluetooth® headset SBH-80. The result? A listening experience as it was intended to be heard. </i><span style="font-size: x-small;"><a href="http://blogs.sonymobile.com/2014/04/01/celebrating-michael-jacksons-new-album-xscape-with-xperia-z2/">http://blogs.sonymobile.com/2014/04/01/celebrating-michael-jacksons-new-album-xscape-with-xperia-z2/</a></span></blockquote>
Although such effort may not fully resolve "<a href="http://seanolive.blogspot.com/2009/10/audios-circle-of-confusion.html">the circle of confusion</a>", it is good to know a well-known manufacturer like Sony is finally recognizing the importance of setting the point of reference when it comes down to sound reproduction.<br />
<br />
<br />
<b><a href="http://rinchoi.blogspot.com/2014/02/sony-sbh80-part2-next-generation.html">To the part.2, General analysis</a></b>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com3tag:blogger.com,1999:blog-7984778625978437479.post-34351624881909453272014-02-15T11:27:00.004-08:002014-02-22T16:27:58.907-08:00Sony SBH80 Part.2: The next-generation wireless audio<b><br /></b>
<b><a href="http://rinchoi.blogspot.com/2014/02/sony-sbh80-part1-aesthetics.html">Continued from Part.1, Aesthetics</a></b><br />
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<b><br /></b>
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<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-3Wp0TvcMaDk/Uv9-f2_Mi7I/AAAAAAAAJGE/0Cpq148ko-s/s1600/logo.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-3Wp0TvcMaDk/Uv9-f2_Mi7I/AAAAAAAAJGE/0Cpq148ko-s/s1600/logo.gif" height="75" width="320" /></a></div>
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<br /></div>
As a part of Sony's <i>New</i> <i>Smartwear Experience Vision</i> project, Sony SBH80's main goal is to be fully integrated in the user's lifestyle through seamless wireless connectivity. Featuring Bluetooth 3.0 standard, Advanced Audio Distribution Profile (A2DP) v1.2, and apt-X compression algorithm, SBH80 is claimed to be the next-generation wireless audio device.<br />
<br />
And of course, as a headphone reviewer, <u>I can care less about their marketing schemes</u> and focus solely on the sound quality of the headset itself. Indirectly, I've dealt with quite a few Bluetooth-enabled headsets while working as a technical advisor at <a href="http://seeko.co.kr/">seeko.co.kr</a>. Surprisingly, every single one of them has failed to impress me. Whether the problem is sourced from a poorly designed unit, or from the wireless interface itself, Bluetooth headsets have always exhibited either a completely skewed frequency response / time domain characteristic due to latency, or a short frequency response bandwidth; I've never seen a headset that can be considered as "Hi-Fidelity".<br />
<br />
... Or maybe not just yet?<br />
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<b>PRO:</b> Excellent channel-matching, wide frequency bandwidth extended well up to 20 kHz. Although there's a good amount of second-order harmonic distortion present at 1.4 kHz, it shall be perceived as 'musical' since the distortion is of an even order. Moreover, apt-X helps enhance the overall sound quality greatly. While strong emphasis in the low frequency range is a little letdown for me personally, others may find it quite entertaining. And due to the driver's resonance-free characteristics(smooth frequency response), SBH80 will behave more intuitively to custom equalization than most of its competitors.<br />
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<b>CON:</b> There's a slight diaphragm flex noise when the IEM is inserted into the ear canal; this may be remedied by porting a tiny venting hole on the ear sleeve with a needle.<br />
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<b>ON SECOND THOUGHT #1</b>: As far as insertion depth goes, SBH80 is invulnerable. Here's the comment of the audio designer, Mr. Smailagic, regarding the insertion depth of SBH80:<br />
<blockquote class="tr_bq">
<i>"During typical shallow insertion depth ... with SBH80, these areas(8-9k and 15-16k) will be relatively smooth ... sharp resonances (especially those in the lower treble range 5k-9k) contribute to frequency masking, so removing these will increase overall fidelity, and as a result, you’ll get smooth and natural treble response."</i></blockquote>
Thus, regardless of what the practical insertion depth is, users should be able to enjoy the sound quality of the headset in full.<br />
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<b>ON SECOND THOUGHT #2:</b> Since the headset is such a fine-tuned product, modifying its acoustic filter design is not recommended, unless the modder really understands what s/he is trying to accomplish.<br />
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<b>ON SECOND THOUGHT #3:</b> Although stock sleeves yield the smoothest frequency response, some third-party sleeves, such as Phonak or UE biflanges should exhibit an equivalent result as well.<br />
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<b>ON SECOND THOUGHT #4: </b> According to <i>Sead Smailagic</i> of Sony Mobile, Sony SBH80 shares many technical similarities with its predecessor, MH1.<br />
<blockquote class="tr_bq">
<i>"...in SBH80 I tried to pronounce mids related to upper bass area in order to further increase clarity and make it more linear DF(diffuse-field) wise, further F0(resonant frequency) is slightly shifted down and is expected to be in range of 2.8-3kHz, compared to MH1 ~closer to 3.5k."</i></blockquote>
And consequently, his statement can be verified by examining the above graph. While maintaining the bigger picture largely intact, SBH80 is tuned to have less mid-bass, downward-shifted ear canal resonance(simulated), and less harsh (quarter wavelength) resonances in the upper treble around at 10 kHz.<br />
<blockquote class="tr_bq">
<i>"... all these ... have actually contributed to an overall heavier loudness curve compared to ... MH1 ... o</i><i>ne another motivation behind the bass boost is also adaptation to various environments in combination with recommended lower SPL listening levels.</i><i>"</i></blockquote>
The end result is a negative-sloped diffuse-field oriented tonal signature with a bit of attenuation around at 6 kHz ~ 10 kHz range to accurately accommodate his reference target. In addition, in order to achieve an ideal tonal balance while listening at a safe sound pressure level, and to negate microphonics/environmental noise derived from portable usage, <a href="http://en.wikipedia.org/wiki/Equal-loudness_contour">the equal-loudness contour</a> has been compensated as well in the low frequency range. Still, while many would find such sound fun & easy to listen to, some, like myself, may find this little too bass oriented.<br />
<blockquote class="tr_bq">
<i>"... one thing that can be said is that these subjective preferences differ quite heavily between different groups. So, those parameters that are common for all those groups should've been seen as basic design approach, while the final tuning should be adapted according to the target group ..."</i></blockquote>
However, as such tuning has been turned out to be more preferred by the majority of users subjectively through numerous research and tests done by Sony, it is inarguable that the decision has been "correctly made" for a consumer product. Since the headset is a product of the engineer's intellectual decisions, I shall honor his idea and philosophy.<br />
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<b>ON SECOND THOUGHT #5: </b>On a side note, SBH80 matches the reference target announced by Dr. <i>Sean Olive</i> of Harman International fairly well. Personally, I prefer de-emphasizing the 70 Hz region about 3 ~ 4.5 dB.<br />
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<b>CONCLUSION:</b> I've never been a fan of wireless audio in my life. Back in 2004, I purchased a wireless headphone made by Sennheiser at a local audio shop called <i>Good Guys</i>. The sound quality was extremely horrible, not to mention a gross static noise that always lingered in the background. I absolutely hated the quality, and never looked back at the wireless technology since then.<br />
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And 10 years later, in conjunction with the latest innovations, Sony finally brings a wearable device that fulfills the standard of the most demanding customers, such as Hi-Fidelity audiophiles. For me, this is a ground breaking moment, which shatters my 10-years-long preconception. From enhanced sound quality to a long lasting battery, there have been so much improvement with the technology, which can truly be described as "Hi-Fidelity".<br />
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As a final remark, here's a comment from the audio designer that sums up the humble, yet noble value of this product:<br />
<blockquote class="tr_bq">
<i>"... with SBH80, I really hope we can get some attention from the audiophiles and show that this product has taken a serious step towards Hi-Fi quality in the wireless headphone market." - Sead Smailagic</i></blockquote>
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<b>For more information, please visit:</b><br />
<a href="http://www.sonymobile.com/global-en/products/accessories/stereo-bluetooth-headset-sbh80/">http://www.sonymobile.com/global-en/products/accessories/stereo-bluetooth-headset-sbh80/</a>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com12tag:blogger.com,1999:blog-7984778625978437479.post-11971085584688057412013-10-04T01:56:00.001-07:002013-10-04T03:08:15.949-07:00RHA MA750 Part.1: Aesthetics<br />
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<b>Introduction</b><br />
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MA750 is a flagship model from an UK-based headphone manufacturer, RHA, who recently have started getting noticed within the headphile community.<br />
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<b>Packaging</b><br />
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<b>The Unit</b><br />
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MA750's housing is made of steel, which means it is built to last. However, it would've been even better if the cable was detachable.<br />
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<b><a href="http://rinchoi.blogspot.com/2013/10/rha-ma750-part2-general-analysis.html">Continued to Part.2, General analysis.</a></b>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com6tag:blogger.com,1999:blog-7984778625978437479.post-84897104154602878582013-10-04T01:55:00.003-07:002013-10-04T03:09:53.689-07:00RHA MA750 Part.2: General analysis<b><a href="http://rinchoi.blogspot.com/2013/10/rha-ma750-part1-aesthetics.html">Continued from Part.1, Aesthetics</a></b><br />
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According to <a href="http://www.rha-audio.com/us/about-us">RHA</a>'s website, they intend to <i>"deliver the most accurate, comfortable and unobtrusive listening experience possible"</i> to the users. And their proprietary Aerophonic™ Design along with hand-crafted drivers indeed represent such commitment.<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-XV4iO2otspI/Uk6ApQDj2JI/AAAAAAAAIxg/mlnwLqdc7TY/s1600/aerophonic_3.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="232" src="http://3.bp.blogspot.com/-XV4iO2otspI/Uk6ApQDj2JI/AAAAAAAAIxg/mlnwLqdc7TY/s400/aerophonic_3.png" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">RHA's description on their Aerophonic<span style="font-size: small; text-align: start;">™</span> Design</td></tr>
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In short, Aerophonic™ Design utilizes end-correction effect of a reverse-horn, and effectively attenuates the high frequency range. Consequently, an accurate frequency response shaping is possible once the horn is combined with a proper design.<br />
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<tr><td class="tr-caption" style="text-align: center;">The official frequency response of MA750</td></tr>
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And surprisingly, the manufacturer voluntarily disclose frequency response charts of their products, just like Audeze and Etymotic Research, all of whom known for great sound quality. As it usually means they are well-aware of what they are doing, RHA must be very confident of MA750's sound.<br />
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<b>PRO: </b>High frequency extension up to 20 kHz & low distortion.<br />
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<b>CON: </b>There's a good amount of channel matching issue below 2 kHz, along with a slightly recessed mid-range.<br />
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<b>ON SECOND THOUGHT #1:</b> Insertion depth-wise, an intermediate depth probably works best for this particular IEM, as can be seen above.<br />
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<b>ON SECOND THOUGHT #2: </b>A sheet of microfiber cloth should help tame the peak at 5 kHz; However, be advised that such modification may push the mid-range even further away than already is.<br />
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<b>ON SECOND THOUGHT #3:</b> To whomever bloated bass is of a concern: Blocking the vent located on the top of the housing should resolve the said problem somewhat.<br />
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<b>ON SECOND THOUGHT #4:</b> In order to suppress the peak at 5 kHz, bore resonance must be adjusted. So here's my recommendation: A pair of large Meelec triflange ear sleeves should shift the resonance, and even out the high-mid range anomalies. And once it is combined with a pinhole vent mod, the sound of MA750 becomes a lot more balanced and enjoyable.<br />
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<b>ON SECOND THOUGHT #5:</b> The purple curve is my occluded ear simulator measurement(raw at the reference plane), while the orange is of RHA. For some reason, RHA's official frequency response chart does not match any of my data. Perhaps it is because they use a 2cc coupler for measurement?<br />
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<b>ON SECOND THOUGHT #6:</b> RHA MA750 doesn't quite meet Harman International's reference target for headphones.<br />
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<b>ADDITIONAL INFORMATION:</b><br />
Manufacturer website: <a href="http://www.rha-audio.com/">http://www.rha-audio.com</a><br />
MSRP: $119.95<br />
<br />Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com2tag:blogger.com,1999:blog-7984778625978437479.post-54057650252602665082013-09-29T20:52:00.002-07:002013-09-29T20:56:05.998-07:00Sony MDR-CD950<br />
MDR-R10, also known as the king of headphones to SONY enthusiasts, debuts in 1988. And the economic downgraded version, MDR-CD3000, follows right after along with other introductory models. These are known as the first generation CD series.<br />
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Starting from CD1000, which has a pair of bio-cellulose drivers within, the introductory models of the first generation CD-series have very similar sound signature from one another. And CD950 is no exception. While its appearance is almost identical to CD1000(except with its ear cushion material), an amorphous diamond-absorpt diaphragm is implemented instead.<br />
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<b>PRO: </b>Linear frequency response characteristic from the mid to treble & extremely wide sweet-spot due to the large driver; there is virtually no placement-induced frequency response variation.<br />
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<b>CON:</b> Lack of bass & high distortion.<br />
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<b>ON SECOND THOUGHT #1:</b> Sony MDR-CD950's frequency response is nowhere close to the reference target suggested by Harman International.<br />
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<br />Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com0tag:blogger.com,1999:blog-7984778625978437479.post-64794709655488389332013-09-28T22:21:00.004-07:002013-09-28T23:08:20.232-07:00Unique Melody 3DD Part.1: Aesthetics<div>
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<b>Introduction</b></div>
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From the China-based custom IEM manufacturer, comes great innovation; a triple-dynamic driver design, which is the very first in the industry. </div>
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<b>Packaging</b></div>
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3DD's packaing is rather simple. Inside of a leather case, there are three pairs of bass dampers, three pairs of biflange ear sleeves, a pair of musician's earplugs, a warranty card, a microfiber cleaning cloth & dust brush, and the unit itself.</div>
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<b>The Unit</b></div>
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The IEM basically stuns users visually, as the three dynamic drivers, wiring, and the crossover network are all crammed into a single unit. In addition, the magnetic bass damper in the rear side of the IEM makes the overall appearance even more enigmatic.</div>
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<b><a href="http://rinchoi.blogspot.com/2013/09/unique-melody-3dd-part2-general-analysis.html">Continued to Part.2, General analysis</a></b></div>
Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com0tag:blogger.com,1999:blog-7984778625978437479.post-45471862545875576602013-09-28T22:21:00.001-07:002013-09-29T03:47:16.540-07:00Unique Melody 3DD Part.2: General analysis<div style="text-align: center;">
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<b><a href="http://rinchoi.blogspot.com/2013/09/unique-melody-3dd-part1-aesthetics.html">Continued from Part.1, Aesthetics</a>.</b><br />
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Some people will call it an innovation, while the others say it is a crazy idea. A ⌀13 mm driver for the woofer, a ⌀8 mm driver for the mid-range unit, and a ⌀6 mm driver for the tweeter coupled into one IEM? That is 3DD, designed by Unique Melody, a well-known custom IEM manufacturer from the mainland China.<br />
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Oh, but they do not simply end there.. On the back of the woofer, there is an adjustable bass tuner made of a magnet, so that the damper, which is also magnetic, can stick on the woofer conveniently. As a result, the level of bass can be precisely tweakable, and the magnetic flux density of the woofer's magnet is effectively increased(thus its electroacoustic efficiency if the resulting B is any significant at all).<br />
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<b>PRO:</b> Wide frequency bandwidth, linear impedance characteristic, and low distortion. 3DD clearly exhibits the best electroacoustic performance compared to all of (semi or not)custom IEMs that have been measured so far.<br />
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<b>CON:</b> The magnetic bass tuner is extremely hard to replace, especially when it is flipped upside down.<br />
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<b>ON SECOND THOUGHT #1:</b> This data may concern the custom version users as well, since their insertion depth should be somewhere between the reference plane(2nd bend) and roughly 3 mm away from it. Surprisingly, unlike other custom IEMs, 3DD's optimum insertion depth is quite shallow, which is located about 3 ~ 6 mm away from the reference plane.<br />
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<b>ON SECOND THOUGHT #2:</b> Even if 3DD is equipped with a source device with high output impedance, the IEM's maximum damping error does not exceed 2 dB at most. Considering the fact that there are three drivers coupled together, such electric damping characteristic is impressive.<br />
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<b>ON SECOND THOUGHT #3:</b> As there are erratic peaks in the treble, some users might want to add acoustic damping materials at the nozzle in order to suppress the resulting harshness.<br />
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<a href="http://3.bp.blogspot.com/-P2PiJvkrNPk/UkfFo3ZYVVI/AAAAAAAAIs0/b7iJ4VUrlNI/s1600/basstuner.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="260" src="http://3.bp.blogspot.com/-P2PiJvkrNPk/UkfFo3ZYVVI/AAAAAAAAIs0/b7iJ4VUrlNI/s640/basstuner.jpg" width="640" /></a></div>
<b>ON SECOND THOUGHT #4:</b> 3DD's proprietary magnetic bass tuner is <u><i>absolutely brilliant</i></u>; not only its precision is bit-perfect with accurate acoustic resistance value, the tuner also doesn't affect the other frequency range at all. Since 3DD comes with 3 stock magnetic dampers(black 88 Ω, black-white 94 Ω, and white 100 Ω), users get to finely adjust the level of bass depending on their personal preference.<br />
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<b>ON SECOND THOUGHT #5: </b>And here's my recommended setting for 3DD users: Simply add a piece of ear foam(3mm x 3mm x 1mm) into the nozzle, and equip the white damper(100 Ω) onto the bass tuner.<br />
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<b>ON SECOND THOUGHT #6:</b> I don't honestly think 3DD needs additional tweak here. It has an adequate level of bass(adjustable), wide bandwidth, and frequency response linearity. Therefore, the IEM shall be listed on my favorites list!<br />
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<b>ADDITIONAL INFORMATION:</b><br />
<span style="text-align: center;">Manufacturer's website: <a href="http://www.custom-iem.com/">http://www.custom-iem.com/</a></span><br />
MSRP: $599 (-$100 for universal)<br />
<i><br /></i>Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com12tag:blogger.com,1999:blog-7984778625978437479.post-71104461557690676182013-09-28T22:20:00.004-07:002013-09-29T06:44:14.010-07:00JAYS t-JAYS Three<div style="text-align: center;">
<i>Disclaimer: This product has been generously provided by Inks!</i></div>
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Driven with a pair of ⌀10 mm titanium-coated moving-coil drivers, t-JAYS is made for accurate sound reproduction and maximum comfort, according to the Swedish manufacturer.<br />
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And on top of that, in collaboration with Dirac, the company well-known for their custom sound optimization, JAYS come up with <a href="http://www.jays.se/curves"><i>Curves</i></a> specifically designed for t-JAYS models. While Dirac's DSP technology works most of the time, it may not do the job as well for some applications.<br />
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<b>PRO:</b> low distortion in the mid-to high frequency range.<br />
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<b>CON: </b>Overly-bass oriented sound signature, an audible peak at 6 kHz, and short bandwidth.<br />
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<b>ON SECOND THOUGHT #1:</b> Unless the IEM is inserted very shallow, its frequency response is largely unaffected buy the insertion depth-induced resonance shift.<br />
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<b>ON SECOND THOUGHT #2: </b>Additional acoustic resistance damps harshness.<br />
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<b>ON SECOND THOUGHT #3:</b> While blocking the front vent increases the amount of bass, it also worsens the peak issue at 6 kHz.<br />
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<b>ON SECOND THOUGHT #4: </b>Dirac's <i>Curves</i> resolves two major issues with this IEM: First, the level of low-mid bass is lessend by 10 dB. Second, the audible peak at 6 kHz is effectively suppressed. For the price of $2.99, I think the app does exactly what it's supposed to do.<br />
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Since IEMs are of minimum-phase(causal), not much of discernible change is expected from the change in the time-domain.<br />
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<b>ON SECOND THOUGHT #5:</b> Whether t-JAYS Three is optimized or not, the IEM still needs a good amount of equalization to fit the reference target of Dr. Sean Olive of Harman International.<br />
<br />Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com0tag:blogger.com,1999:blog-7984778625978437479.post-75755197532694777622013-08-30T02:44:00.001-07:002013-08-30T09:28:42.213-07:00Astrotec AX60: A K3003 Clone from China?<div style="text-align: center;">
<i>Disclaimer: This IEM, which is not released in the US yet, is owned by a mutual friend of mine. Measurement has been carried out approximately 3 mm away from the reference plane with a pair of reference filter attached.</i></div>
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AX60 is Astrotec's new flagship hybrid IEM, featuring a dual balanced-armature transducer as a tweeter, and a dynamic transducer as a woofer. Currently, there are many hybrid IEMs, such as Audiofly AF78, Atomic Floyd SuperDarts, T-PEOS H series and Ultrasone IQ, in the market; The competition is indeed stiff. What is so special about this particular product then?<br />
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According to the manufacturer's calibration data, AX60 is precisely tuned to match the sound signature of AKG K3003, <a href="http://rinchoi.blogspot.com/2012/09/akg-k3003-part2-general-analysis-updated.html">of which I consider as one of the best IEMs ever made</a>. (but not my favorite)<br />
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The secret of K3003's articulate tonality lies in varying the size of front cavity and utilizing a tailor-fitted acoustic damping scheme. And of course, the technique is patent-protected not only in the US, but also even in <a href="http://211.157.104.87:8080/sipo/zljs/hyjs-yx-new.jsp?recid=200910127446">the mainland China</a>. If Astrotec have successfully reverse-engineered the sound quality of K3003 without infringing the patent, AX60 will certainly become one of the top contenders.<br />
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<b>PRO: </b>By 'default', AX60's electroacoustic performance doesn't even come close to AKG K3003's sound quality.<br />
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<b>CON:</b> There are quite a few: <u>A time-coherence issue (phase-related) between drivers just like Westone UM3X(not as bad as this one)</u>, high distortion, bloated bass, and finally, a clearly subjectable peak, which coincides with a half-wavelength resonance of a closed ear canal, in the treble.<br />
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<b>ON SECOND THOUGHT #1: </b>Whether the IEM is inserted shallow or not, the problematic resonance is always present in the treble, piercing the listener's ear with extreme harshness.<br />
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<b>ON SECOND THOUGHT #2:</b> Although AX60 has a balanced-armature transducer implemented within, it is not hindered by electric damping as much as expected.<br />
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<b>ON SECOND THOUGHT #3:</b> For the sake of overall tonal balance, it might be better off to simply remove the stock filter and replace it with a small foam as a dust protection.<br />
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<b>ON SECOND THOUGHT #4:</b> Since the rear vent works as an acoustic low-pass filter, blocking it will tone down the exaggerated bass to a reasonable level.<br />
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<b>ON SECOND THOUGHT #5:</b> Here's the moment of truth: Have Astrotec really reverse-engineered AKG K3003 and created their AX60? Surprisingly, once AX60 (reference filter) is barely situated at the entrance of the ear canal, which is equivalent to the distance of about 9 mm away from the reference plane, its frequency response becomes very similar to that of K3003 (reference filter) inserted at about 3 mm away from the reference plane.<br />
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Of course, these two IEMs exhibit completely different time-domain & electrical characteristics. Moreover, this match will be completely broken even with a slight displacement of 1 mm.<br />
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<b>ON SECOND THOUGHT #6:</b> Apparently, Astrotec AX60 is not really a clone. The IEM is certainly tuned to match the sound of K3003, but with under a very specific condition, which can hardly be met in practice. The overall design is more of a fun college project gone weird due to misunderstanding in some of basic electroacoustic principles. Not only the IEM has an issue with time-coherence (@ 1 kHz) between transducers, but also the insertion-depth induced problem in the treble is not properly addressed.Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com8tag:blogger.com,1999:blog-7984778625978437479.post-82345124086413472982013-08-26T22:29:00.001-07:002013-08-26T22:36:25.761-07:00Phiaton PS210<div style="text-align: center;">
<i>Disclaimer: This IEM is owned by a friend of mine.</i></div>
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Phiaton is a high-end brand of South Korean company, Cresyn, which was formerly known as Leemax. As they have been manufacturing OEM products for Panasonic, Audio Technica, and many other well-known companies for a very long time, they must be well-aware of what they're doing.<br />
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...Or are they?<br />
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<b>PRO:</b> PS210's frequency response well follows the diffuse-field tolerance limit assigned by ITU.<br />
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<b>CON:</b> Short bandwidth. Although the left unit is slightly faulty; this must be an isolated case.<br />
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<b>ON SECOND THOUGHT #1:</b> Unless inserted too shallow, frequency response linearity shall be well retained.<br />
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<b>ON SECOND THOUGHT #2:</b> With an added acoustic damping material at the nozzle, the tonality becomes less harsh.<br />
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ON SECOND THOUGHT #3: There are three acoustic vents located in front of PS210's housing.<br />
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<b>ON SECOND THOUGHT #4:</b> Whether this is a coincidence or not, with minimum amount of modification, the IEM can be tuned to sound pretty similar to AKG K702... Believe it or not!<br />
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<b>ON SECOND THOUGHT #5:</b> Phiaton PS210 needs more sub-bass and slightly less emphasis in the treble to be considered as Hi-Fidelity.<br />
<br />Rin Choihttp://www.blogger.com/profile/01033604846161090040noreply@blogger.com0