Aerial 10T Owners and Anyone that can help

Here is my deal and gear:

Gear:

Theta Casablanca
EAD TheaterVision CD/DVD
Citation 7.1's (3)
Aerial 10T's

Now, the deal:

I have the 7.1 bridged into 2 channels, 450 x 2 @8ohms, very high current, 70 amperes. My gain is set to 0 on the Theta and using Madonna cd for pushing limits or the gear.
First, at excruciatingly loud volumes, the music will start to cut in and out. When I turn it down, it is fine. So, I am thinking it is the amp. I finally switched amps, to a Marantz MA-24 (30WPC CLASS A) and the same thing happens.

Here is my GUESS (guess being the key word here):

The Aerial 10T's have some type of cut off from the power amps to prevent damage to the drivers. Is it possible too much juice or distortion? What would cause the speakers (assuming this is the culprit of shutdown) to do this?

Any help is greatly appreciated.

Dan