Surround sound speaker wiring


I am newer to the home-theater setup and have a couple of questions about the wiring I should use.

I currently have a decent 5.1 system and looking to possibly go with a 7.1 higher end system in the future.

What gauge should I use for the surround speakers and main speakers? I was thinking 12 gauge.

Should the wire be solid copper or stranded?

I assume that the wire needs to be rated for in wall. As I have a ton of extra 12-2 NM from the regular wiring, could this be used?

Thanks for your help,


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