This is my take on what matters and what is good enough to get CD quality sound from your PC.
The type of digital file
Use .WAV file or MP4 at 128kbps or MP3 at 192kbps good enough
Quality of the ripping/compression software
Quality of music playing software
Just about anything will do
Question 1: Do you thinkt he above is good enough? Is there anything else that matters? Does the quality of the sound card make much of a difference? Could the cables used to connect your PC to a good system make a difference? I connect one of those small bose acoustic wave systems to my sound card.
Question 2: Also, has anyone ever noticed a difference in sound quality when playing a CD in their computer's CD player as opposed to playing it in a standalone CD player?