Main issue is the volume adjusted in the digital domain? or the analog?
If digital, the problems of major loss of resolution with digital attenuation is as mentioned by others.
Otherwise, if it is with a standard analog form, no problem, except the cheap analog volume control likely present in the Cd player.
If digital, the problems of major loss of resolution with digital attenuation is as mentioned by others.
Otherwise, if it is with a standard analog form, no problem, except the cheap analog volume control likely present in the Cd player.

