Maybe thats not such a bad idea??

It seems to mee Audyssey is detecting room suckout not the -3db point of the speaker. In a way, its making a bad thing (a room mode reducing frequencies between the real -3db point and 150Hz) and making it worse. Too bad you can't manually set the -3db point.

Edit: I'm glad I don't have the choice of Audyssey on my receiver. This stuff can be confusing enough as it is.

I was thinking the same thing as Fred, just dump Audyssey and try it with a 80hz XO for the rears, sides and center and 60hz for the mains and see how it sounds.

I am thinking the M2s wouldn't be any better than the QS's, they have a high roll off point as well according to their graph. Maybe a set of M3's with that upper bass hump/depressed mid graph would be the better choice for rear duty in that large of a room, other than a second sub placed behind the listener to even out the bass response through out the room which really appears to be the main issue.

I also remember when I first got my surrounds I really wanted to hear them. I paid for them dammit! Once I settled in and got used to the whole 5.1 things, the surrounds started to sound better when they were properly level matched.

*snicker*

Just wait till you have kids CV, then you will really know what rear duty is.

Good thing I'm sterile with no prospects!

Where to go with a setup like that...

I can think of only four places...

Heaven, Hell, Earth, and...?

Um, "REAR" duty.
I'll let you figure out the fourth option.