Dedicated 20 Amp Line for Audio

A search on The Cable Company site shows audiophile grade in-wall cable from JPS Labs and Audience. There is also a highly regarded British cable manufacturer who offers an audiophile grade in-wall cable, but the name escapes me at the moment. They are not inexpensive, but in the context of an upper echelon system they are not outrageous.

longplayet - Not sure if I would qualify for upper echelon, but I definitely want to go above domestic grade. Thank you for the leads! I will check it out

A note on 10awg romex.  Yes, the wire is extremely stiff and you may not be able to install it.  You CANNOT fold this wire when pushing the outlet back into the box.  It is just too stiff.  When I did mine, I had to run the Romex straight through the wall from behind into the junction box and then "square bend" one wire at right angles so that there's enough space.  A 12awg romex would definitely be much easier to handle.

auxinput - Thanks, but I'm not even so sure about handling 12 awg, just ask oldhvymec. His hands hurt jusut talkin’ about 12 awg! (sorry I can’t paste his comments, as he removed his post?)

I used this https://www.gigawatt.eu/produkt/in-wall-cable-gigawatt-lc-y-3x4-mk3/

for my dedicated line, 11ga, flexible and directional. It ssounds incredible.