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Im putting a 1500W RMS amp to run my subs and a 360W RMS to run my mids/highs and I will have an additional a battery to power the system. It's not that you need the battery, but you will get more out of your system if you have it. And in my experience, without the extra, if you are running the system high right before you park the car (for a lengthy time period) you do run a higher risk of the car not having enough power to start. It really all depends how you are going to be using your system.
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