yesterday i took my old FW-C80 out of the cellar and plugged it over the AUX input into my PC. I realized that the sound quality - especially the woox performance was quite bad.

I then put a simply music CD into the player and the sound was awesome again.

Is there any chance to get the same soundquality over AUX input?

And yes, i know that this old audio system isn't listed in the sticky post

Thanks for any suggestions!