My first set up was one 1200 watt amp and one 1 farad capacitor. I have since upgraded to two 1200 watt amps (same exact amps) and two 1 farad capacitors. With the one amp i needed the capacitor to stop my headlights from flashing. With the dual amps and caps i get head light flickering no matter what. I guess there is only so much they can do. But i bet if i disconnect one capacitor it will make no difference, so i wasted my money on an extra cap. The one benefit of the dual caps is that if i disconnect my battery, within a 15 second window i can almost...almost start my car(of course it would never really start). I wonder if all these electronic guys at crutchfield and everywhere else glorify capacitors so much then why don't we just hook capacitors up to every damn accessory in our car. Lets put caps on the headlights and the head unit and the damn dome light (maybe it won't surprise us and kill the battery everytime we leave the on). When i read and listen to and logically truy to recreate in my head what a capacitor does, it makes sense. But with actual experience, they do nothing but shock my ass when i disconnect the battery and touch a hotwire that shouldn't be hot.