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Monday, October 1, 2012

Vsonic GR07 mkII

Once again, my brother Inks set an arrangement for me, so a Head-Fi user, Flysweep, generously let me borrow his Vsonic GR07 mkII. You guys are truly good fellas.

Unfortunately, I neither have a clue what this IEM is nor who the Vsonic is, but according to the manufacturer's website, GR07 is a studio-monitor flagship model, equipped with a driver which has a bio-cellulose coated on its diaphragm. As far as I can recall, there has been only one earphone with that technology implemented in the history of headphones: A good ol' discontinued SONY MDR-E888. How interesting.



PRO: Very good built quality with an uber distortion performance. This is the lowest I've seen from an IEM. A nice gesture from the manufaturer to ensure users' wearing comfort: Not only GR07's stems are pivotally adjustable, the IEM comes with whole bunch of ear sleeves. The impedance characteric is very stable too.

CON: The polarity is inverted; not a flagship-quality. GR07's spectral balance somewhat reminds me that of SONY MDR-EX1000, IMHO. And obviously, the rated frequency limit of 30,000 Hz is just NOT TRUE.


ON SECOND THOUGHT #1: As expected, once the vents are blocked, the sub-bass gets either boosted, or attenuated. Since this vent prevents the IEM from getting over-pressurized, I would not recommend blocking them what so ever.








ON SECOND THOUGHT #2: Surprisingly, GR07 do not get affected by different insertion depths as much as other IEMs, possibly due to the low acoustic output impedance the biocellulose driver has. Of course resonant frequencies do shift, but overall tonality is quite well preserved.







ON SECOND THOUGHT #3: As mentioned, GR07 is almost free from the electric damping issue, which happens to be very problematic with some IEMs. Even a 100 Ω resistor does not alter the frequency response of GR07 at all.

10 comments:

  1. Just curious, where are the vent ports located? I'm pretty sure that one of them is just behind the nozzle, but I can't seem to find the other.

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  2. Thanks Rin, these measurements look great. BTW, how do these compare with IEMs in it's price range (under $200, BA200, Rock-It R50)?

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    1. IMHO Vsonic GR07 mkII registers all the way up there along with HiFiMAN RE262/272 brothers, Sony MDR-EX1000, and TDK BA200. While they are all equally great, GR07 mkII's advantage comes from practicality. Not only it is free from insertion-depth related issues, the IEM also comes with a crap load of sleeves for you to choose. You can't possibly go wrong with such package.

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    2. How does ADDIEM + 33 Ω resistance compare to GR07 MK2?

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    3. ADDIEM + 33Ω owns other IEMs in terms tonal linearity and bandwidth extension, but keep in mind that ADDIEM's distortion figure is one of the worst ever made. :P

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  3. Rin, is the peak at 6.5k audible? Thanks

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    1. That's the mechanical resonance of the driver. It is indeed audible.

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  4. If you don't mind me asking, what're the prerequisites in order for an IEM or headphone be considered "flagship quality"? (By the way, I'm a long time follower or your blog and I really appreciate your efforts! I'm looking forward to your "Wall of Shame" list. :D )

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    Replies
    1. Thnx, blurrymoon!

      1. Linear frequency response characteristic relative to the diffuse-field target
      2. Well-extended treble up to 20 kHz
      3. Non-bloated bass (at least adjustable)
      4. Low distortion
      5. And preferably, polarity properly aligned.

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