hi, i don't usually mess with this stuff, only auto mechanics. but i wanted to know what i would need to put a better stereo in my car, at least a general idea. so far i have a box with 2 12" woofers and a pioneer stereo. what else do i need? im looking at a few amps but amps are what confuse me the most. what are channels for? how many do i need? how many watts? civics also have pretty small batteries, do i need a capacitor?