Originally Posted by RogueGypsy

I have to agree with pulpmind. While just about any wire will get the signal to the speaker, phone or data cable is not a good option.

You biggest problem is going to be voltage loss over long runs. Phones/data typically run on stepped down 14v power. Audio is typically 7v nominal. You need bigger wire to reduce loss.

I'm sure there are audio installers in your area, let them handle it (we usually charge a little less than network installers too).

Oh, and if I read you post right you're going to have an impedance problem too. If you split the channel and run it to (2) speakers on the same line, the impedance will be cut in half. Most amps don't like that and will release the magic smoke in a short period of time. Usually just after the warranty expires.