Thanks for the replies guys. I have the amp with no switches or aux jack. I just sourced a used set up. I'm going to test hooking up the current amp to the bass wires and see if I can make that work. If it is indeed too much bass then I'll revert back to "stock" and hook up the used amp. I'll run with that for a while and see how it sounds. I'll most likely keep the "adjustable" amp installed with it hooked up to the bass wires.