Yes a .wav should sound identical to a CD. Remember there will be differences if you're using the empeg equaliser or the bass/treble controls on the pioneer CD player. I suggest you set all loudness/bass/treble/equaliser controls to flat/zero before trying to do any real comparos.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)