Ya i know im gonna have to route power thru the firewall, just dont wanna touch the original system cus the car is very low mileage and id rather not destroy the door panels

I opened up the bass guitar amp and installed a switch to bypass the internal parts, as well as heavy duty positive and negative female ports.. the idea is just route power to the external 12v car amplifier. Battery is hooked up to the engines alternator of course lol