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I plan to use a 500w Alpine R12 subwoofer, with an Alpine pdx 1.600 600w amp. How many Amp Hours in a battery pack do I need to run this for 5 hours?I'm entirelly confused by suggestions online that this system would be drawing roughly 40 amps, making it run for an hour on a 40Ah battery. Can this be right? Thanks a lot for your help