I have taken the easier but more expensive route by using plug-and-play transformers that are made to sit with your gear, not in the basement under your breaker box. The two best known audiophile brands are Richard Gray and Torus/Bryston. These products have their own AC power cables that simply plug into a wall outlet. I happen to use the Richard Gray Rack Mount Pro. The model below that is their Substation. Their largest is the Powerhouse. The Torus products come in various power outputs, as well. In any case, I would only use a 240V/120V version. All you need is a 240V outlet next to your gear--simple, clean, direct with no worries about phase. The 240V versions deliver more wattage, and this is what you want--a dedicated 120V, 20 amp line will deliver 2400 watts, so you want to equal or exceed that. If you are running two 20 amps lines for two big mono blocks and subwoofers, then you may need an isolation transformer for each side of your system. I also use the RGPC 1200C for my front end. These are all expensive, though, and heavy, as they should be. They do not limit peak demands, they supply them, and, as said, they isolate your system away from ground and grid. Results in my old house have been a broader, more relaxed and articulate low end and sound stage. The new AC OCC cables have taken everything to a new plateau of clarity and presence.
