I need some good advice about two sub set ups

[Mboyle1145]

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.

[mylows10]

there are many subs that will work.but most will do better in a ported box and be louder .need a budget

[Mboyle1145]

My budget is around 300-400$ for one sub. My buddy can get a fi q 12 for around 150 so i thought that was a good deal. I would run two of those but then my problem would be getting a amp too run both that doesnt cost a arm and a leg.