as posted at headphones/headphone systems for dummies:
Hey Aeores and PX100 owners,
Na-inspire ako nung vwap tweak
So I started cutting holes on my px100 pads... started with the size of our 5 centavo coin [buti na lang me nakatambak dito sa coin-tainer ko ]... me improvement! so I just made bigger holes... so now my px100 pads are PISOmodded
Compared it against the unmodded pads [buti na lang me dalawa pang nakaPX100 dito sa office ] and the pisomod is better better midrange and treble, even the bass improved... sounds like you moved nearer to the performers/music the music is 'clearer'