on another hand i have a fi q d2 in a 2.5 ported box tuned to 30hz and it gets down low, has a smooth response all across the board and can get loud when needed to as well. i highly recommend it. I also highly recommend image dynamic subwoofers for sq, as well as old classics like tc 2+ motor designs like rl-p's and also motor designs like Adires XBL2 design.
lota options. i considering selling my 1000 watt amp and fi q soon idk if ur intrested but im thinking in few weeks down road ill be posting them up fs.