I myself was in the sound off circuit for a good 8 years and now I just do it for pleasure. When I started in 88, two 15" subs would get you in the door. But that soon changed as you must know. So if your going for SPL, better be packing some 15 CV 18" strokers. While having a well balanced RTA score as well. What Amps did you get for your 1200watts ea. Sounds like Hifonics Colossus or something along those lines.