We have used Crown K2's (one per box) and also the I-tech 8000's (2 LABS per channel) and both have worked really well.
We blew a 20 amp breaker with the I-tech 8000 one show, it must have been putting out quite a bit of output power. As the owner of twelve LABS, I have become quite a fan of the LAB subwoofer design. In 5 years, we have only replaced 2 drivers, both in the same box and the result of a broken pole piece, Not the drivers fault. I'd put these 12 under anyones array in any arena and am quite sure they would do just fine.