How did you gather this?
Audessey is probably indicating that at least with regard to bass, you have a pretty good setup on position of the mains and the MLP, and are not sitting in a null at real low frequencies.
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You said that Audessey indicated a 40Hz crossover be used if you left to its own devices.That implies that the measurements it made when you had it do the analysis in your room showed strong response ar least to that frequency.
Since the measurements made in the one thorough review I had seen on the 590 had the response measured from 40Hz to 20 KHz at +/- 3db, it isn't likely that you would see that good low response in room unless you had things positioned reasonably well. I am not saying there are no dips at other frequencies, since that is unavoidable in most rooms just from floor bounce.
That, plus my own experience in setting up my 590's ( stereo only ) this month led me to that assumption. I had to do a lot of positioning trials with the speakers to get them set up right, with moving the couch back as the final key element to getting out of an area with a null. I am now getting strong response down to the low to middle 30's. My initial setup when I first got them did not have the bass sounding nearly that good.
I do have the benefit of a room that will let those long wavelengths develop. Although the loft they are in is 13.5'x17.25, it is open to the great room in back. When I moved the couch back, the listening position was moved so that it was back in the area open to the hallway on the right, ( rather than being contained within the area of the 3 close walls) so on the axis if the center of the couch, the room is 40+ feet deep and 40+ ft wide. Moving the couch back 1.5 ft in to that area made a huge difference in the bass quantity and quality.
Attached pic is a view from the speakers looking in to the room, to give a visual of what I described.