Actually, 500w is about the minimum that I have used that will open up Maggies. As any Maggie owner will tell you, "more is better" as far as power goes. Now, I have not used the Classe's before, but I would suggest using them in a mono configuration and you should be more than fine.
I tried 12 different amps with my 3.6R's before I found my current, and final configuration. Good luck, don't be afraid to try something else if you are not getting what you want.
I tried 12 different amps with my 3.6R's before I found my current, and final configuration. Good luck, don't be afraid to try something else if you are not getting what you want.