So I can't decide on which sub to get. Whichever one I get well be running off a hifonics glx.1400 at 1 ohm at 1400 rms. One is the American bass xfl 15 in a 4 cubic for box tuned to 32Hz. Or a 12 inch american bass xfl in a 2 cubic foot box tuned to 32Hz. I mostly listen to rap, dubstep, and trap music. I want it to be as loud as possible. But I have heard that 12's hit higher notes and 15's hit lower notes and are louder but hit slower and can be behind. What do you guys think? I guess the most important part for me is being the loudest with full range.