Just installed new amp and sub, need help.

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Before i ask this i just wanted to say i have no idea about the stereo or subs or anything about. I got a new amp and sub 1000watts insalled free by my friend. He said that i would need to get a cannister installed for my system because it is going to drain my battery, and he also said i cant use my subwoofer to the fullest (he said i can only have one plug plugged in instead of both or my system will mess up and that i have to keep my music low because my wiring is messed up that it could be grounded.) He said that his frend could rewire everything and add a canister for $150. Im sorry if this didnt make sense but is this a legit price? Im not sure on what to do. Thank you
 
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