Hi Nate I also have 2 12" XLC's and a G800a2...the exact same stuff as you except my amp is the 2 channel version. I had some dimming of lights but after adding a Lightning Audio 1 Fared Energy Capacitor the dimming is 99% gone. I'm not sure what kind of output your alternator has, but mine is a 90 amp alternator and if yours is smaller you may still have problems, i'm not sure. I do have a great idea for you though...First buy a 1 fared capacitor and if that doesnt help to your satisfaction then look into purchasing an Optima Interstate battery and I guarantee that'll take care of the problem. An optima battery costs about $120-150 and a 1 fared capacitor will cost maybe $100-140 depending of where you go. If you have the money, do both. An energy capacitors purpose is to release energy when the supply coming from your battery becomes too low to make the amplifier function to its full potential and a better battery will obviously provide that much more juice. By adding both you will notice a great increase in sound intensity, and sound quality. As far as your alternator forget about it because they cost alot and are only a last resort if a battery and cap dont work...which with your amp they will, perhaps a cap will even be enough...as i said earlier it was for me. In case you were wondering i'm hitting 147.8 dB on an AudioControl IASCA style mic. I'm very proud of my rockford stuff and I hope you feel the same way. Hope I've helped.
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Dustin
