I just made a DRC filter for my ath-m30s.. quite a dramatic improvement.. Out of the box these phones are not particularly neutral. I tested the freq response with the filter and it's absolutely flat from 30hz on up. I haven't done much critical listening yet but they sound very nice now.. very...

I was browsing in Radio Shack the other day and I spotted an odd looking pair of Koss's I'd never seen before. I believe the model was 'Koss R/70-b' .. There were strange first of all because they came with a detachable microphone but who really cares about that. The interesting thing is that...