Dear Rockhead,
Some CD players have built-in volume controls. These can be operated using knobs or buttons on the CD player or buttons on the CD players' remotes. Often the manufacturer will describe the volume control as digital or analog. Analog is better. Digital works by discarding some musical information to attenuate the volume. This can cause audible degradation in the sound. If your CD player doesn't have volume control capability, you need a preamp or a different CD player.
Some CD players have built-in volume controls. These can be operated using knobs or buttons on the CD player or buttons on the CD players' remotes. Often the manufacturer will describe the volume control as digital or analog. Analog is better. Digital works by discarding some musical information to attenuate the volume. This can cause audible degradation in the sound. If your CD player doesn't have volume control capability, you need a preamp or a different CD player.