I don’t have much first hand experience myself, but have researched this a lot. The answers you can expect will hit these points, plus others:
- run a direct line (or two) from your breaker box if you can. 20A each
- noise on people’s systems varies a lot depending on where they live, how many others are on the circuit, etc.
- a whole house surge suppressor is a good way to go but it’s not necessarily a solution to noise
- P.S. Audio sells regenerators; some like them, some don’t, but they’re 30 day free shipping trial if you are curious
- debates about the wire in the wall are endless and people take different sides
- conditioners can suck the life out of the sound; some advise plugging amps in directly; others think that’s too risky, surge wise. There’s debate.