idk the ohm configs u have and all but almost any 2 15's port (correctly tuned and size box) with just decent power will be loud.. the hifonics amps have lost the following they had even a yr ago., if u don't have the amp yet i'd look at others.. also dont know about rockford subs i have seen good reviews i would suggest u look at sundown E and SA and fu 750 and 1250 and cab ultra subs (car audio bargain) before buying anything..