It's about 8-9 feet from battery to rear inside my '03 Celica. I'm running Infinity Perfects 6.1 and 5.1's comp's and a single 10w7-3 in an H.O. box. My amps are JL 300/4 and JL 500/1. total RMS is about 800 watts. What gauge power cable should I use for optimum performance? Oh yeah, I also have a 1 Farad Digi Cap.