Where did you get those graphs Ron? Are they stock besides changes in pads?
I'm surprised how flat the pleathers are, I feel like the majority of them adds a mid bass boost and decreases the treble. I do enjoy the treble detail with the velours as well as the sub bass bump. To me the hollow sounding or reverberation on the pleather is a deal breaker. The larger opening th600 doesn't have that issue though.
Here is the address: http://personalaudio.ru/raa/otchety/naushniki/
I would personally use it mostly for comparing between various headphones... As we don't know the exact metodology and stuff. But looking at some other graphs, at least bass and mids should be OK as they are presented.
I personally enjoy the subbass bump with velours as well :-) But I enjoy better mids and treble of the pleathers more. And modding the pleather pads kind of improved the experience as well - with the felt inside, they are more tough so they hold their shape better, resulting in a better sense of space (and maybe slightly better imaging as well with the angle)... And I think it kind of added some sort of a slight subbass bump as well as also already mentioned - maybe again because of a slightly worse seal in comparison to the stock pleathers?
Edited by Ron12 - 6/6/14 at 2:29pm