If your putting those into a huge ported box I wouldnt give them 1200 daily. Put it in like 3ft. cube, or put them in a sealed box if you want 1200. I have 2 12's and they are hitting Xmax with 900-1000 each daily in 3.5 cube box....when i crank it i can hear them start to distort.
You can still hook up your amp, just turn the gains down and adjust it from there to a "safe point".