HIGH Quality Electric Service Panel

There is the Isoclean Zero Ohm breaker panel, but I’m not sure if they make it anymore since it’s not listed in their current products (used pure copper elements and gold plating). At $5k, I don’t think it’s in your budget, since balanced power is not. I have seen some panels that have a built-in isolation transformer, but I can’t remember the brands.

Like Eric said, Siemens or SquareD. In my case, I went with SquareD because it was available locally. Use 20 amp breakers instead of 15 amp. Run as many circuits as you want. Use a single run of Romex per outlet. You can have two runs of Romex connect to one breaker (but check local code on this).

You can get cryo treated Romex here:

http://audiosensibility.com/blog/accessories/parts/wire-and-cable/#!/Cryo-Treated-Electrical-Cable/c/5828813/offset=0&sort=normal

I’ve used this vendor many times and he is excellent. Even though he’s Canada location, he ships via USPS Priority from New York to anyone in USA. Prices are in CAN (just multiply his price by .77 and you get USD - for today’s exchange rate).

I have noticed a difference in sound between the awg of the Romex. A 10 awg Romex can carry a lot of current and is great for amplifiers. However, source/preamp equipement is more sensitive to the awg and will blare somewhat (push to hard) with larger gauge romex. Amplifiers are much less sensitive to this. Using a 12awg Romex for source/dac/preamp is probably better. I actually use a double-run of 14awg Romex for my preamp outlet (essentially a 11awg run).

Of course, choose good quality outlets. I recommend Furutech FPX Cu (unplated copper) as a minimum. It’s a good neutral sound that is fairly inexpensive You can go with gold-plated if you want a warmer/softer sound or rhodium plated if you want the detail/punch/resolution.

Per the MSB topic -- one thing I have discovered through power cord experimentation and testing is that the larger gauge solid-core A/C power wire will have a natural roll-off of high frequencies. This was very apparent to me when I constructed a power cord using three 16awg solid-core conductors for each of the live/neutral/ground on my power cord. What happened was that I lost high frequency detail. It made my equipment sound "lo-fi" and it actually caused the midrange/midbass frequencies to blare some. Using 18awg solid-core worked better, but the best was when using 20awg solid-core conductors (my power cords are now all 6 x 20awg, which makes a 12awg power cord).

That being said, if you are using a larger gauge solid-core Romex, such as an 8awg or 6awg, this may naturally help roll-off or remove any high frequency noise coming in from the power grid. Just make sure you are using solid-core.  Stranded THHN (or similar) won’t do the same thing. Stranded wiring will actually help accentuate high frequency problems. I would just make sure that the equipment power cords are able to support the high frequency charge/discharge required for your equipment to obtain those charges fast enough for the power supply. Rhodium plated outlets and power cord connectors (such as Furutech) will definitely help in restoring the high frequency detail.

@jea48 - thanks, I haven't looked at 8awg or 6awg Romex, so I didn't realize they were only available in stranded.  Also, you're right on the outlets only allowing a max 10awg wire, though the Furutech outlets do have multiple inputs, so you could splay the 8awg strands into two bundles for the Furutech outlet inputs, but probably not recommended.  It's best just to use a double-run of 10awg Romex if you wanted less resistance to the outlet (and keep solid-core wiring).  This gives you an equivalent 7awg.

It's interesting that a single solid insulated 8awg wire is available, and individual wires could be used in this case.  However, they must be run in conduit from the panel all the way to the outlet (per electrical code).  Romex is the only thing that can be run bare in-walls or in attic without having to run through conduit.  And your right that it's probably a freakin pain to work with (too stiff and can't bend enough at right angles).  10awg Romex is hard enough to work with.