whoa, there's quiet a bit of confusion in here. .
Giving much more than 1500w rms to a 12W7 is asking for major trouble.. Especially if you listen to big bass.
I'd find an amp that could feed them 1000w rms each.
Are you a pure SQ fan? If so, I'd much rather go with an IDMAX.
Oh, and you might have read a lot of BS on the net regarding the awesome capacity of the W7.. Dont believe too much of it, cause its just a sub like any other of the high end stuff.
Hope this helped.