czarivey, Did you buy a used home? Or move into a preexisting apartment? I guarantee the duplex outlets there are all old as the building is. No normal person replaces any duplex until they are broken. that usually means the duplex outlets when YOU move in, are already 10 to 40 years old. When I move into a new apartment, I replace all the outlets with new ones right off. Ditto the light switches.(since I stay more than ten years.. it just makes sense to me.)So generally replacing outlets is more like replacing nearly broken down crap that works, but does so poorly, with something that will work well for years to come.++++++++++++++++++++++++++++++++++++++++++++++++++++TTman.. As for the quad 20 amp circuit. That is all you need, usually. Unless you like to play music at over 100dB (which is really loud)In that case it will not matter anyway, since you will soon be deaf. and the distortion in your ears will mask any in the equipment.
So I am saying you do not need a separate circuit for your CDP, or preamp, or any other equipment. If you want some improvement, I would suggest getting a small powerline conditioner for your CDP, plugged into the same circuit as the amp.