I made a matched pair of 13 awg long speaker cables myself
Cable: Cat 8, OFC, 22awg x 8 strands = 13awg
this seller has longer runs, they don't show up in the pop-down menu, just write and ask
I bought a 50ft red run, cut it in half, cut connectors off
also 50ft black, cut ...
got two 25ft runs red and black
cut off the connectors, attach WBT type pure copper spades with pair of allen set screws
I got my OFC copper/gold plated connectors at Ali express, sometimes I order from Wish. I'm willing to wait to keep costs down, these days perhaps takes too long.