Wow, away from my computer for a few hours and look what happens!
- Speaker wire is pretty much just stranded copper wire with red and black jackets. It is the same as almost all other wire. Though romex would work, since that is solid core it may be hard to work with. If you get commercial wire (THHN or THNN) you can get stranded. Minerva, not sure where you are, but I am located in the Midwest, around here if it is not transporting 120V the inspector doesn't care, talked to him when I was doing my theater. I think Googer you better check your local codes, or maybe my inspector just wasn't interested (by how he looked at the rest of the stuff I find that hard to believe though!)
I went to my AV shop and got a real of 14AWG stranded speaker wire, it was more than romex (about 2X cost) but being stranded it worked well, and sheathed in a set made for a simple installation. As was said as long as the wire is heavy enough for your run (there was a link showing it) should not be an issue. my longest run was about 30ft. Use can use whatever wire, just telling you how I did it.
And no, it was not Monster wire, high grade O2 free seems like a scam to me at $0.79/ft. I will stick with my $0.24/ft wire I used! Connected my Bose speakers to my Bose TV all with Bose wires! Bose Wires, guaranteed to convert Standard broadcast to 1550P HD Signals!