Ok, well these are the lvl xl subs then, i take it? Thats what its sounding like to me. Thats what im working on here soon, 2 15 xl ran off a crescendo 3kwp. Rockford does make amps thatll easily push a pair of these. The t2500 does their rms plus, or their higher amps. Ive seen people push them with sundown audio saz3500/4500, atomic, american bass vfl400.2, vfl500.1, stetsoms, cactus audio just a few brands. Depends whats your price. And youd have to upgrade your alt for any of these amps, or to supply correct power to any amp thats gonna push those subs. The dc xl is between the lvl 4 and 5, rated rms of 1500 each, your looking at over 300 amp current draw atleast.