Electrical and Grounding Needs

This would be my recommendation as long as you have an electrician coming in to do the work. First get a 220 volt line to run to the subpanel in the audio room (or adjacent room). At the end of the 220 volt line connect a toroidal transformer to step the voltage down to 110v. With the right wiring method this will give you 2 live poles of +/- 55 volts that are out of phase, thus canceling much of the inherent noise on the line (although there probably isn’t much after the isolation transformer). The problem here is finding a transformer large enough for your needs. I used one that was rated at 30 amps at 220 volts (6.5 kVa). That’s pretty high, and it may be difficult to find one at that rating. I’m still looking for some common sources for one that’s rated that high. The subpannel then gave me 4 separate circuits all independently filtered and grounded (one for the projector, one for amps, one for analog, and one for digital) I then use 10 gauge solid copper to the outlets which are all Hubble hospital grade. Hope that helps.

Rives suggestion is an excellent one. Perhaps one suggestion to add to Rives: if you are able to convert your equipment, especially the amp to 230 volts, then you would not need a step down voltage converter. Instead, you would have some of the best AC you could practically muster. But this last step takes know-how and gonads but is cheap with excellent results.

Your electrician or perhaps Rives could best answer your question about isolated grounds.

-IMO

I agree that the suggestions by Rives are good. The isolation transformer may be a tad expensive though.

If you do not use a transformer, the only way to get a true Isolated(in contrast to Dedicated ground)ground, is to have the electrician put an isolated ground bar in your new sub-panel, and run a separate ground wire that is not grounded to any thing else until it reaches your main house grounding point, where it will need to be connected per the National Electrical Code.

Then your electrician can install true isolated and dedicated grounds to each Isolated ground type receptacle you install. This will ensure a separate grounding path back to your main gounding point with no other grounds tied to it in-between to create noise.

Thank you for all the great input! I will go over this with the electrician:-)