If they are in a dual setup, 4.5cubic foot box, tuned a lil higher than ideal (38hz :/). Max power must be 500watts RMS per sub. The kickers get 400, the DCONs get 300. Basically asking, what would be the best replacement subwoofers for the DCVR12 Kicker box/setup. Must be 12s, must work with 4.5cubes before displacement, must be able to be wired to a final impedance of 2ohms, and must be around 500watts per sub or less (or at least outperform the CVRs at 500watts or less). I know "better" could mean many things. In this case, im asking more for overall, SQ+SPL. But suggestions on what would be better for just SQ or just SPL is fine as well.