Alright, right now I am running 2 RFD1212 Rockford Fosgate punch HX2 subs and am using a RF 1050S amp to power them. I've heard alot of good things about Adire Audio and was thinking about getting a 15" Brahma loaded in a snail shell box from powered4sound.com. As far as SPL goes would that be quite a bit better than my RF's? And would my 1050S amp be able to power the brahma alright?
I'd do the Brahma. Twice the excursion of an HX2, more surface area than a single 12" HX2, and much better SQ. Put that thing in a ported box and you'll hit just as hard as you'd ever want to. Your amp will work well with a Brahma.