Ok so I have two 15s(Kicker comp vrs), NVS entity tower speakers, 6 amps, my stereo likes to shut off with that low voltage alarm when I turn my subs or the volume up. I currently have 6 batteries should I add a couple more or a install a bigger alternator? Or both? Whats the best high output alternator? I can watch my voltage on my capictor drop to 12 volts if my subs hit decently hard then the low voltage alarm sounds and shuts off my stereo. So what should I do its killing me?! Whats the point of having a massive system if you cant turn it up!?