Recommended power alternator per RMS


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according this site ( 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.

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