Dedicated 20a lines, 125 feet distance, which gauge wire to run?


Want to set up 4x dedicated 20-amp lines for my hifi system. The distance from the outlets to the breaker box is about 125 feet. What wires should I use? 10, 8, or 6 gauge? And should they be solid or stranded? If you could be as specific as possible that would be appreciated (brands, links, etc), as I am out of my depth here. The wire will need to run underground for a good portion, and then into craw space, if that makes any difference.
battbot
I’m not saying you should avoid Furutech, but avoid Rhodium plating.

Oyaide and Leviton are fine brands as well.

Here’s a great source:

https://www.partsconnexion.com/ac-receptacles.html

Chris is a great guy, I’d literally call them for advice. If you stick with Furutech, I'm going to recommend the gold over copper as a much better performing outlet:

https://www.partsconnexion.com/FTECH-74278.html
This article about how to wire your house for good power will tell you everything you need to know. It’s excellent. https://www.msbtechnology.com/faq/house-power/