Im trying to hook up 2 amps the ones for subs ( 2 12" p3s in ported box)are already hooked up to (rockford fosgate p1000-1bd). Im trying to figure out how to hook up another amp for my highs? Also im hearing things about a cap? Do I need one and will it interfere with hooking up amps? My lights dim a lil when turned up but not like kill my battery...any help would do thanks...