you could get a large 6 channel amp to run the in boats and a good sub, the syn 4 for the rev's and you are done. 3 batteries and an on board charger, you would be able to run for days. i have 3 syn 4s, a jl600.1 for a xs12 sub, 6 in boats xs650s and 2 sets or rev10,s i would have never had bought 2 sets of rev 10s but had a chance to so did, not needed but killes, and i thought i would have no battery power. If you get efficient amps, you can run for ever. I have on onboard charger but only charge a day a week or less. we have never had a problem and have run for 6 hours straight in the cove cranking it. I learned the hard way on my last 2 boats. i tried to cut costs, buy cheap and it always came back to bite me in the @ss. Take the extra time to save a little more and get the better gear. nothing is worse than hitting the lake with your buddies and the batteries fail, amps shut down, over heat, cut out etc etc. do it the right way. good luck
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