MA's monoblocks might be alright, but a buddy of mine got one of their "4000w" 2-channel amps a few years back (it was huge, chrome, rack mountable, had two level meters on the front of it, and two cooling fans) and had the thing hooked up to a single L7, i've never heard of someone putting 4000w rated power to a l7 daily, and he's still got the same l7.
Maybe their type-x's do rated, i dunno. But i wasn't too impressed for an amp the size of my house.