Cryongenically treated in-wall AC power wire

Here’s simple info.
For wire, find and buy top quality “fanatically shielded” specialty 10 ga used for the most sensitive commercial applications; super critical robotics for example. 
For ground information go to the Equitech website. The man behind Equitech’s patents, Martin Glasband, has created products that have solved more ac power noise problems than “all” the other electrical engineers on earth! Mr Glasband is a real expert; has authored sections of the US Electrical Code. He has helped many personally. 
Also, the most important factors in your new wire are 
1. Shielding
2. Termination
3. Placement in your walls.
4. I would use at least 3 separate runs which gives you great flexibility for experimentation in the future. 
With quality cable don’t give a thought for a few feet here or there. Irrelevant. However, make sure you have enough that in each run the wire is relaxed; do not install it ‘tight’. 
Be aware that there’s an endless amount of “voodoo” and utter “nonsense” from some “fools” in this forum. They are not well meaning; just plain ignorant, stupid, or both. 
Also, if/when it’s affordable an Equitech 2Q or 3Q will improve your sound “ dramatically”. Best wishes. Pete

Draw out your new room and equipment locations precisely to scale. Consider all equipment you may want. It’s an important project. By all means have a normal compliment of wiring regardless of your hi fi demands! Seriously consider wiring through metal tubing suitable for underground use. This will also facilitate install and allow future upgrade. 

I suggest asking the specific wire manufacturer. I am conservative minded and have experience with highly critical processes and equipment  I feel caution and expertise are appropriate. For example, Calmont Wire and Cable has supplied critical wire for NASA among other hi techs. . They have a toll free direct to engineering. I’m interested in what you discover.