here's another question....
1) why did you set the amp to only give 1200w when its a 1500w (underrated) amp? the bl can handle that amp //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif
2) did you use a 0db test tone? if so, try a -6db. ive never had a problem using -6db test tones, setting gains on sub amps.