Quote:
it is easier for your computer to play back the cda file than the mp3, because it requires less processing to play back the cda. that is why i was saying it sounded better from the disc and that is the only reason why...

Sound quality has nothing to do with CPU cycles (except when the sound stops if your computer is too busy doing something else). CD's sound better than MP3's simply because they have more information in them.
It has been my experience that the biggest problem with using PC's for audio playback was all the electrical interference going on inside the machine impacting the audio out. It would seem to me though if you can keep the signal in the digital domain, and decode that digital signal in the receiver then you should have a good clean signal.