my HTPC works great but for some reason, during blueray playback only, the audio is VERY VERY low. i have to turn up my tv almost all the way to hear it. i've tried digging around in the audio properties and have yet to find anything to help. im using powerdvd 9 and the previews are LOUD as hell but when you play the movie its super quiet. i cannot find the option to select 2ch instead of 5.1 in powerdvd so perhaps you guys have a better answer?