This simplified diagram shows how a full-blown car audio system upgrade gets wired in a car. The system includes a 4-channel amp for the front and rear pairs of full-range speakers and a mono amp for a subwoofer.
This is my older setup. Im currently working on the new setup. Just waiting on the weather to get better. Rear seats currently removed and the box in production. 2- TSW5102SPL Subs and second PRSD2000SPL and four yellow tops coming sometime this year. New pics soon. By no means a show car. I compete for SPL only. Eventually will clean her up more, but not for awhile.