Allan,

Are you installing in-wall wires in your living room? If so, I think you should use the double-sheathed cables specifically designated for in-wall wiring. I see a 100’ roll of 12-gauge for about $20 at PartsExpress. Alternatively, you can lay the wires under the wall-to-wall carpet along the edges, or even in the middle of the room using flat wires like those from Monster. I also use Cordmate II raceways from Home Depot for an easy on-wall wire installation.

Cheers!