[A big thnx goes to my dear friends, rubin, who is the owner of the older NT6, and shwl, who gladly loaned me his newer NT6. I truly appreciate them for the contribution!]
Originally started as a distributor of hearing aid brands such as Phonak and Starkey, Hidition is currently the only custom IEM manufacturer in South Korea. Unlike other CIEM companies such as Earsonics and Heir Audio, who still bang their heads against a tree stump when it comes to electroacoustic evaluation, Hidition has a capability of analyzing their own products using an equalizer, a microphone, and a simple silicone tube. It is quite disappointing though, that one of my friends, nalsse, have helped them setup the measurement jig, but Hidition never give him a credit for the contribution.
New Tears 6 is one of Hidition's top-tier models, which goes for $1,200, featuring a triple bore technology. As the internal crossover of the IEM is said to be revised once, the current model and the older model will be compared/analyzed together side by side.
CSD: NT6 Ver. 1
CSD: NT6 Ver.2
Phase response: NT6 Ver.1
Phase response: NT6 Ver.2
ON SECOND THOUGHT #1:
While the first version becomes more linear with extra serial resistance added, the second version ends up with attenuation in the treble. In other words, the lower the devices' output impedance, the flatter NT6 ver.2 becomes.
ON SECOND THOUGHT #2:
Each bore has a dedicated role in Hidition's triple-bore technology.
The bore diameter is actually thinner than that of Knowles dampers, so in order to carry out a damper modification, the damping screen has to be extracted from the plug, and inserted individually into the bore.
ON SECOND THOUGHT #3:
shwl: Nordost 7N, OCC-7N silver-plated
rubin: Hidition old stock, Hidition new stock, 5N copper, DIYer(fate)'s flourescent cable, Nordost 7N
udauda(Rin): $20 Furutech cable from Ebay, Ultimate Ears stock
My friends have sent me seven cables for this analysis, and my two cables are added to the pot. As expected, the OCC-7N silver plated cable and the Ebay furutech have the highest conductance, while rubin's Nortost 7N performs worse than others, indicating my friend rubin has been completely scammed.
And the actual electrical conductivity of each cable goes like this:
OCC-7N > Furutech > UE stock > shwl's Nordost 7N > New Hidition stock > 5N > Old Hidition stock > Fate's DIY flourescent cable > rubin's Nordost 7N
ON SECOND THOUGHT #4:
By utilizing both electrical and acoustical damping modification techniques, NT6 can be finely tuned to match the Olive-Welti reference target. As far as NT6 ver.1 goes, insert a gray damper into the tweeter bore, and equip a 33 ohm resistor. On the other hand, as NT6 ver.2 is pretty much on target, a white damper on the tweeter bore will do the trick.
ON SECOND THOUGHT #5:
The difference between ver.1 and ver.2 is quite huge. Not only the crossover design has been revised, the overall acoustic damping scheme has been adjusted to tame the harshness of ver.1.