10 gauge speaker wire is multi stranded and not the same as 10 gauge electrical wire which is very difficult to pull through walls.

I back up Bren on the wire gauge - just think of the electrons as water through a pipe. The bigger the pipe the better the flow. The longer the run, the more your signal attenuates (weakens) and if you start with a small gauge wire, it may reduce your sound quality or put an extra load on your amp.

Exaudio ergo cogito ergo sum