according this site (http://www.the12volt.com/info/recwirsz.asp) i should have a 120 alternator at least in order to handle a 800 RMS audio system. I'm thinking about buying a 800 RMS kenwood amp to power my 2 12" subs. My alternator only works at 70 amps. Should be enought to handle it ? What about buyin' a 1 farad capacitor, should it help without upgrading the alternator/battery. I just want to know if my alternator will work for 800-900 RMS.