Another suggestion the media player that you are using eg windows media player, winamp etc make sure that volume control is set to at least 80-90% volume.
As Johnny G said I also have my windows volume set at 80-90% as it can clip(overload the receiver input if everything set at full volume)
Two of my computers setup its hooked up to the same stereo that is close by in the basement.
One of the computer uses the same old Sound Blaster Live card. The SB card is much better than the one built on the mother board much smoother, cleaner, and open sound.
Then I realised that I had a older AMC 18bit DAC sititng down not being used.
So I connected both computer to the DAC using a 75ohm coaxial cable.
the sound was much better than the SB vocal was easily more detailed and open, the topend was much cleaner and the SB sounded compress.. Now I just select from the DAC what computer I want for sound as one computer I use as a home server.
Marvin what's a reel to reel
just kididng what do you have a Tanberg, Revox, Teac.