Originally Posted by davidsh
^Did I quote you?
On another note, I'd wish the new mod would adress some of the incoherency of the mids compared to velours, though I don't see how to improve on that aspect.. The only thing I like over the jergpads when we are talking vocals, is the coherency the velours seem to have. Don't misunderstand me here, the velour mids are definitely flawed in other ways.
If you are really curious about what exactly I have been trying to fix, I can tell you (and others who are wondering).
IMO the biggest issue with Hifiman pleather earpads is ringing in the midrange, that I have said times and again. Having damping holes on the undersides of the pads helps that dramatically, but it is not nearly 100% complete in damping the midrange, there is still a nasty midrange resonance around 600 Hz or so (spanning about 50 Hz on either side) even with Modulor's or my own v2.0 Jergpads.
Now, ringing doesn't show up on FRs or THDs, it only shows up on CSDs but even then anything below 1500 Hz on CSDs is just a big smear anyway, so that's hardly useful. But it's very obvious with sinewave sweeps and listening by ear, and in music tracks that happen to emphasize the frequency band that is resonant (in this case, certain piano tracks and ambient music, which actually sound painful due to this "glare").
This extra modding step was my attempt at giving the pleather earpads some degree of air-damping, instead of just partial absorptive damping (of the underside holes leading to the guts of the earpads). This is done by adding port holes around the outer rims of the pleather, so that the whole damping scheme gets closer to velours (where excess sound energy passes through the inner enclosure and through the earpad foam and out the velour fabric all wrapped outside), but not nearly as drastic.
It's an idea that has been floating in my head since I first started brainstorming modding the pleather earpads, but that I never dared to really consider because it is so destructive (you cut holes into the pleather material!) and ugly (holes all around the outer rims of the earpads) and be potentially bad for the pad longevity (dust etc could easily trap in). But Modulor's method of the velour top mod, where he actually encases the modded pleathers in a complete shell of velour earpads, completely solves those issues. Apparently Modulor's considered something similar too but didn't dare to act on it.
As for the actual results of doing this mod (rather than just hypothesizing about it), to my ears it cuts down the 600 Hz ringing substantially, not completely, but by a large margin. This in turn makes piano music bearable (and actually good-sounding) finally, and vocal music is less stuffy/cupped. I can't say that the 1kHz-2kHz region is raised due to this change, but the abrupt transition between lower midrange and central midrange definitely evens out a fair amount.
In my honest opinion, having smoother transition from 500 Hz to 1000 Hz in HE500 is way more important than the presence of a dip at 2kHz, the former determines the clarity and listenability of the midrange as a whole, while the latter just adds/detracts forwardness in the midrange.
I didn't go over everything with this fairly long post, and this is just an ad hoc unstructured post, but I hope that is a slice of my thought process (with regards to my approach of experimentation with modding) that could be understood with you guys.
Edited by jerg - 9/3/13 at 6:36pm