I use semi-flat wiring for my surrounds. I originally received (through an accident at the dealer) flat wire similar to what Axiom sells, although smaller gauge. It did not work for my application (I didn't like the adhesive, and it didn't look good on my wall), but again, I haven't tried Axiom's. The cable I have is 16 gauge, stranded, but it's molded into a flatter cable than standard speaker wire. Works just fine.

I am the Doctor, and THIS... is my SPOON!