I have a rockford t1000bd the big silver version and i have it running two type r 12s at 1 ohms. They are in a dual sealed box. They bump so loud and warp my windows. I am looking to get one sub that is just as loud or louder running to the same amp which claims 1500 watts rms. I have a friend that has the hook up on fi audio and i was thinking about running one fi q 12 in a 1.5 cuft sealed box. Woud this be just as loud or louder? Any comments or advice will be much appreciated. thank you.