alright. yea i was hoping to add my whole other system and also use the bose speakers (not sub) to add to my old system. Its my dads car, and im puttin a HU in there soon, heres what ill do. Ill have the old bose system set up to the new hu, and ill just lay my polk/pioneer speakers near the doors and plug it up, but not have it installed and hear it. That way i can pretty much see how it sounds but not cut anything yet.
the only question is, how do i mix rca's? ie the back of the HU has inputs for front, rear, sub, and when i test out both systems ill have two rca's for front and two rca's for back, how do i do that?