For the reason you state, there should be absolutely no difference, audible or inaudible, if you use the cd player's digital output. (There may be notable build quality differences of course) If you use the analog outputs however, the player is doing the D/A conversion, and there will be a difference depending on the quality of the player.

[black]-"The further we go and older we grow, the more we know, the less we show."[/black]