I wouldn't try that simply because it will void your 5 warranty and especially with an expensive piece of equipment such as the 800. Voiding Axiom's warranty replacement/customer service is not worth it in my opinion just to add a gimmicky product such as dynamat to the enclosure. I am not saying it will not work, I just don't like the tradeoff. But you are free to do anything you like of course \:\) .
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne