Yo, i had 2 12" Polk MOMO's and a rockford fosgate bd1000.1 amp and my headlights dimmed a lot, and my alternator whined, and my alt got fuked up, and charged my battery at 26 volts, hence fuking up my batt...... So, i got a regular alternator, then i got a Optima Yellow Top (DEEP CYCLE) which is made for a lot of big stereo's and shit, and everything was perfect, but just to be sure, i put on a Rockford Fosgate 1 Farad Digital Capacitor! Its sweet, and i know i wont fuk up my shit anymore
You dont need to go to extremes like i did, just go buy a Capacitor!