I met up with one of the fellows behind Summit HiFi the other day(Canadian Emotiva Dealer)...he owns 4!!! x EP800's.

Nice review 2x6.

Like many people, I am wondering how much difference there is between the M100's and M80's esp when a sub is in the mix. Does this negate the slightly better low end of the 100's or are there any other advantages?

Half of communication is listening. You can't listen with your mouth.