I'm using the Xonar Essence STX (sound card), so I really don't know how the circuit works.

Hi guys, I've done a few searches and read a bunch of threads about opamps, but I'm still having trouble picking one. I have a Xonar Essence with 2 AD8620 and it sounded great with my senn pc350. I just got the HD 598s though and it sounds terrible. The treble is way too harsh.   Can someone...

Yeah I did two fairly big holes and at first I thought it was way too much, but now I really like it. I definitely wouldn't add any more though.

  I have no clue how to reattach the pads. Where does this piece go?   http://farm6.static.flickr.com/5090/5287247678_5f77720224_b.jpg   Edit: Nvm, figured it out.