Hey Email -
IMHO, super-duper expensive wire and circuit breakers aren’t going to help you much in the power realm. But there are things that will. It’s all about lowering the noise and resistance.
Here are some things that have worked for me - in no particular order. I can not say if any of these are NEC (National Electric Code) or meet your local code - so have your local electrician sus that out. In fact, I had trouble getting an electrician to follow my suggestions - I got lots of eye rolls and “we’ll get back to you” when I was looking for assistance with these projects. I wound up doing much of it myself.
My Suggestions -
Conduit home run to your outlet. The conduit acts and shielding for your power lines.
I use 10AWG silverplated Milspec, teflon jacketed wire. Easily found on eBay and less than $2 a foot for my 40’ run.
Use said wire for home run from your panel to the outlet - including a dedicated ground. Even though you have conduit as ground, use dedicated ground wire, also home run to the panel. We want as low of resistance to ground as possible.
If you can, no other power lines run through this conduit. K.I.S.S. We don’t want any noise from other circuits getting in there. (this one I had to break as I needed two 20 amp circuits in the same area and had no room for a second run of conduit)
Quality outlet and/or filtered outlet. I manged to track down one of the old PS Audio Solo outlets. It helped a little.
Have more ground rods added to your panel to again lower the resistance to ground. This is where an electrician helps. It’s easy to add more ground rods to your ground, but a good electrician should have a special meter that can measure your current ground impedance (in ohms), and prove to you that adding more ground rods has lowered your resistance to ground. We want to give the noise an easy path to ground and away from our system.
I did all of this for less than $600 and the drop in noise floor was impressive.
Again, all we’ve done is lowered resistance, and improved the shielding/filtering of our power. That’s all your power system really needs. You might be able to push this further with audiophile grade isolation transformers or filters at the panel, but for what I paid I’m pretty sure I’m at the point of diminishing returns for very little money.
Then of course, a nice P5 or P10 and a DirectStream with the latest OS to bring it all together.