i just got a small 8" powered bazooka just to add a little more bass to my sound i have the basic sound system in my acadia. and i was wondering where can i connect the subwoofer to. i know how to get the power. my question is do i have to run the sound wires all the way to the radio or do i run them to the rear speakers. and what is the metal box on the left side of the rear compartment next to the jack. is that the amplifier can i connect it there. i just dont want to tear up the dashboard i dont want rattles in the future. ????