you would probaly do better getting 2 middle price subs than 1 high priced, generally ive seen that 12's are 12's and theres only so much you can do with them, i had the fi q 18 and it knocked out 2 12's easily, but then again it depends on the 12's you get, i know theres combinations of 2 12's out there that will blow 18's out of the water, i watched a video of some guy with 4 12 ssa icons and them *****es pushed some air now, i aint gunna lie, watch that vid