Just purchased a Denon POA 2200 off of ebay. Thing is a monster. It has a cool cd only input, and I have connected my old Yamaha cd player with remote and gain control.
I am stunned, and also wonder why this feature is not offered today. Funny thing is that I have had the cd player since the late 80's, but just got the amp yesterday. But, the amp is from the same time period.
Do understand that the cd player has a gain(volume) control. The amp is a dual mono design, and has gain for each channel as well.
Just having fun.