i have one rockford fosgate amp connected to two subs ( the model amp is 150 a1 it is 150 watts, and the subs are just um profiles 12in) this rockford amp is connected to the battery for the power and the deck, all hooked up. I have another amp a pionner gmx 962 its 760 watts also connected to two subs. this is also connected to the battery and deck and all hooked up. I have another set of 12 in subs and an pyramid 400 watt amp. How do i hook up the amp to another amp without doing the full hook up to the car battery and deck, so i can run the other set of 12 sub off of it?