Kos, Ray is right on target. When I was in Rome His Holiness also advised me that God didn't make no bad copper and that it was sinful to waste money on the high-priced stuff. As Ray said, a good source would be the section in Home Depot where they have the big spools and can cut what you need. As to gauge, it's probably time to cite the speaker wire article again. You'll note from the table that 14ga should be plenty for your needs.

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Enjoy the music, not the equipment.