I have some (mainly for the car) mp3s downloaded on to cd. When a cd player's spec says that it plays cd, cd-r, cd-rw but not mp3 or wma, does that mean it doesn't read them from a cd? Is this also the case for amps?
Amp not a problem. CD player must have MP3/WMA capability - otherwise at best it will simply not play the disc or at worst will send nasty noises through the amp as it tries to do so.