I recently bought 500 ft. of Tributary 12ga. in-wall speaker wire and have about 150 ft. left over. I still need to run my subwoofer cable though, Does anyone know if it would be ok to splice RCA plugs onto the wire, or would this degrade the sound quality? or is it just not possible....I've never tried splicing an rca connection before....any advice would be greatly appreciated. Thanks. Dan M.