Right now i have a kenwood kac-x301t amp pushing a 12" Rockford P312D4 sub. I am using 5 guage (scosche brand) power wire. Do i need to get a capicitor or do i need to get 4 guage wiring. maybe a new battery? I just bought a rockford P6002 amp but havnt hooked it up yet. if im only pushing 1 sub will i need to replace anyhing?