I have not compaired both head to head, so i can not help you their.
I own mtx subs, the 8000's, and i love them to death. Id recomend MTX to anyone.
But for the price of one w7, you can find two mtx 9512's for the same price. So you can basically ask, what will hit harder, two mtx 9500's or one w7....
... i think you can answer that for yourself.