Right now I've got this amp: http://www.head-fi.org/t/269458/review-zero-24-bit-192khz-dac-headphone-amp-pre-amp which is connected to my computer through the built in realtek optical port. It's hooked up to a sennheiser HD595, as well as to my speakers through a cambridge audio 640a v2.    ...

Hello, I currently own a HD595, a x-fi titanium and a zero dac/amp with upgraded opamps and a hdam module. I recently looked into the compass dac, and it seems a very nice upgrade, i am particulary interrested in the gain options, because my amp is mostly at 7 - 8 o' clock. My question...