See part IV of the jergpad mod linked in my sig. Quick little mod that takes maybe 5 mins and uses nothing more than some double-sided tape, boosts the extension right up.
It's basically what Audeze does with their pads on LCD2/3s, except they provide their "in-house" double sided tape ring. The adhesion of the earpad undersides to the cups seems to be the trick to boosting sub-bass extension.
Edited by jerg - 5/2/13 at 2:14am