^^^this^^^For the same price as four L7s, get two DD 9915s, put them in a ~9 ft^3 box with about 150 sq in of port on 5-7K and let that **** absolutely doo doo on everyone else's setup in your area. Especially if they're the types running Kicker/RF/JL subs anyways.
And to the OP, no a Boss Audio 5000 watt amp does not put out 5000 watts, or anything close to it. Just being preemptive, I can see that being the next question.