To me it sounds just fine. I know some people believe that BMW HK amp is lame but I am ok with it. Just to let you know up front, the amp is not meant for the low votage audio output you get from the PC. You WILL notice a drop is sound volume, there are tons of thread on this issue and suggested workarounds. It also has to do with your pc audio is unbalanced where your HK amp needs balanced audio. You need a convertor, SVEN4 from Peripheral Electronics. Just read this thread: http://www.mp3car.com/vbulletin/show...=16568&page=16