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Message: <blockquote data-quote="Blackout67" data-source="post: 8895749" data-attributes="member: 683415">That's the general rule of thumb for AGM batteries. For lithium I think the rule is 15ah per 1000 watts or something like that.However a lot of this will depend on your listening habits and what you are going for and how much you have to spend.You really don't need 16k watts to be loud. Going from 500 watts is going to be a massive change.Personally I'd stick with 2 15s and a 3k amp with a 240 watt alternator and a nice lithium battery. If your box is designed well for your subwoofers you can easily hit 140 DB. Plus you won't have to spend thousands in battery reserve or in a bigger alternator. Are you planning on just having a daily bumper or are you going to competitions? What you are talking about is going to be kind of unwieldy as a daily driver</blockquote>

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