I have a lot of ethernet cable, so can I use that instead of speaker wire. Ethernet cable has 8 - 24 guage wire in it. Can I use 4 - 24 guage wire as the positive (RED) and 4 - 24 guage wire as negetive (BLACK)? Which would make it 18 gauge wire because 4 - 24 gauge wire equals 18 gauge wire.