if you go to the link above, the first two sub enclosures are designed for a 15" Brahma. i know that the box are almost identical in cu ft. but i am a little confused about the tuning. I will be buying one between these two.

which of these enclosure works best for a Brahma 15" sub powered by a Hifonics BX1500D amplifier? i am about 60% spl and 40 % sq. would using all 1500 watts in this enclosure a good idea? or should i wire the amp to see a 4 OHM load (about 500 watts)