12AWG speaker wire

I understand OFC, OCC, UP-OCC, after that I could care less. I have a buddy that paid 10K for OFC/teflon/tungsten. They still sound great. He tried to sell them for 2K not even an offer. I'm very sure after new terminal ends, and adding a construct or two, they would be right up there with other great cables. The great thing about some older cables they are broke in and just need a little TLC. Terminal ends that are pressure welded with contact enhancers were rare 20 years ago. You can DIY for the cost of a few tools now.. Graphene dust, 2 ounces will last a lifetime for cable building. 50.00 dollars..

It's not what you use as much as how you use it..

williewonka used OFC at one point.. They were still great cables.. Some were wound the wrong direction, they still sounded good.. :-)

+ 1 williewonka

If the runs are really long, shorten them up.
NO I don't want to hear it.. Shorten the runs and move your equipment. :-)

If you have to make your own unless it's an RCA don't solder anything if you can. Pressure weld or use securements of like alloy. Silver terminal ends use silver screws.