Im not seeing what's so special about those Massives. They certainly dont show all the specs, but 600watts power handling from that speaker seems a bit weak (large motor, 12 spoke venez. basket, wide surround, etc). Unless its highly efficient, it doesn't have the displacement potential its appearance would indicate. A 2.5" voice coil is nothing to write home about. And finally, them trying to advertise it as a '1200 watt' subwoofer does not give me a warm and fuzzy feeling about the speaker's true performance.
Anyone have some real specs on these things?