If I had a dedicated listening room, I would put in a 20 amp circuit first thing. Period. If for no other reason than to isolate the system. Not just from noise, but other unneeded current draw. Big monos pull some real current. It DOES make a difference. Audible? Possibly somewhat subjective, but definitely worth it for a dedicated room.
I was just talking to an electrician the other day about a full house surge unit. He suggested just doing that myself, they are pretty easy. When I asked about a circuit he said in a room, great idea, but the way my system is setup (whole house system) not the best. Certainly agreed that a power conditioner and outlet upgrades were a definite improvement. I use a Furman Elite Linear 15. It draws little power from the "wall" and basically has an "amp" to fuel the electronics. Very worthwhile and noticeable addition.
I was just talking to an electrician the other day about a full house surge unit. He suggested just doing that myself, they are pretty easy. When I asked about a circuit he said in a room, great idea, but the way my system is setup (whole house system) not the best. Certainly agreed that a power conditioner and outlet upgrades were a definite improvement. I use a Furman Elite Linear 15. It draws little power from the "wall" and basically has an "amp" to fuel the electronics. Very worthwhile and noticeable addition.