First, let me say that I am not that familiar with car audio installation. With that being said, I just purchased 2 of the polk mono block amps to push to polk mm12's. I also have the polk 4 channel amp to push my highs. Highs are polk 6'1/2 component and polk 4*6 panels. I was told to run all three amps that I would need an aftermarket alternator and battery. Could someone here verify that for me, and if so possibly direct me in a good direction to receive a good price on these items.