I finally installed a dedicated line to my listening room. I used quality solid core 11ga wire from a new sub-panel to make the main run short as possible, installed a quality outlet and have very good power cord. The change was like a new component and improved everything across the board especially the big class A SS amp I have. Everything took a while to break-in but this was a worthwhile improvement. I only wished I had done it sooner.
Power Cables and Wall Sockets
Without knowing for certain, it seems to me that power cables can only be as good as the in-home wiring coming to the wall socket. Is it possible that those who use expensive cables have improved the wiring to the socket? Or is the power from most wall sockets normally excellent, but is limited by conventional power cables?