So I've recently come into posession of 2 gorgeous Digital Design 9512 subwoofers. I am planning on getting an amp that will deliver about 4000 watts to both subs. Before this I had a 12" RE MX sub (till I blew it) running off a 1000w jl amp in a 3.0 cubic foot box. I have never heard a pair of DD's in person so I'm just trying to get an impression of how much louder these babys will be.