Capacitor or no capacitor?

Please, I DON'T want to hear about how overrated you think jl is. but i plan to power 2 13w7s with a 2000watt amp. I'm currently powering 1 with a 1500 watt amp. The capacitor i have pulls about 12 amps. in order to power the new amp, will i absolutely need a high output alternator. I don't understand... show more Please, I DON'T want to hear about how overrated you think jl is. but i plan to power 2 13w7s with a 2000watt amp. I'm currently powering 1 with a 1500 watt amp. The capacitor i have pulls about 12 amps. in order to power the new amp, will i absolutely need a high output alternator. I don't understand why people tell me that a capacitor won't help... when it's saving my alternator right now. can someone draw these things to a conclusion for me?
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