I'm really happy with my V1's (have two pairs) so really curious what all the hub bub is about this harsh treble in V2 or ZS6?
@hakuzen,
Thanks for showing details of your setup. That adapter would fit the tip of my calibrated measurement mic perfectly. A sweep with REW software will show the differences in this treble peak. Once I get my hands in a V2 or ZS6, I will measure.
Siegfried Linkwitz shows how you can connect an IEM to a mic to measure frequency response. It's important to find a soft pliable tube that mimics the diameter, length, and softness of our ear canal. The length is important as that will cause resonance peaks and dips due to reflections off the ear drum and back into the IEM. This is why foam tips helps, they attenuate that hard impedance mismatch and soften the resonance peak. Usually it is at about 2.5kHz and 7kHz. Linkwitz even developed a passive notch filter for his Entymotic ER4's. He said it just won't sound right once you hear what it is supposed to sound like with that 2.5kHz and 7kHz peaks removed.
http://www.linkwitzlab.com/reference_earphones.htm
Passive notch filter circuit:
So here is my hypothesis: adding that second BA driver right at the tip increases (by 2x) the hard material cross sectional area (the BA capsule) of stuff that can reflect sound and cause a resonance. This resonance has nothing to do with a different BA driver or even the crossover, it's where it is located, so it's purely an acoustic transmission line theory for modes of resonance. That's why adding foam earplug tips help. It's also why a small wad of foam or acoustic damping fluff helps. If this is true, it is kind of a design flaw for something that's supposed to be "an upgrade". If I am right, the V1 will always sound better.
Start hoarding those V1's until they come out with V3's.