I will be building my own box for the subwoofer, however, I would like to know which subwoofer would work best with the amp I have. Infinity Reference 611A 456 watts RMS x 1 at 4 ohms (657 watts RMS x 1 at 2 ohms) Which do you guys think I should go with? I know that a larger box will require the subwoofer to take less power, so, in addition to which subwoofer you think I should go with, what box dimensions should I use? I've heard only good about Mach5 subwoofers, so I want to have my very own