That's the big thing I find hilarious. If Audyssey can't get one of the most basic settings right, how much faith are you really willing to put into it?
I don't know if it is a right or wrong thing. I am just saying if I leave the as found XO (60 Hz in my case),then I know if the mains are playing the exact same frequency between say 40-, at the same time the subwoofer does, I would get a dip, others may get a bump, and it may or may not be an audible thing. I am also not sure if any system, Dirac, Anthem ARC, Trinnov, or whatever can do this better, because XOs are just not brick walls or they shouldn't be for practical reason, so to EQ the individual speaker in a room is one thing, to EQ them altogether the software/hardware will have to optimize the numerous scenarios that a multi-channel (even just 5.1) system can produce.
Specifically in my case, If I change the as found XO manually to 80 Hz, the dip got so much better, to the point I have not seen better published results, aside from
@Pogre, who also took the time to do the best he could. In theory, if manufacturers can standardize on the slope of their crossovers, a good REQ software, not limited by processing power, should be able to integrated better. It is worth noting that even if I leave it at the as found XO 60 Hz, the unsmoothed graph still look pretty good compared to the one with Audyssey off. SVS advised that I should use 1/12 smoothing, and at 1/12, the as found results were very good as far as they are concerned, so again, I am just nitpicking on the as found results.
The only other system I have tried is REW+minidsp, it gets some decent results, but no where near as good as XT32, and you still have to play with different XO. I am still hoping to try Dirac live soon, after that I can do a comparison.
I don't really want to hijack the thread too much, but would really like to show you what I am talking about, may be you can shed some light on something.... So please take a look of the attached graph.
Black - Audyssey off
Blue - Audyssey Ref XO 80 Hz (post Audyssey adjustment)
Red - Audyssey REf XO 60 Hz (as found)
Again, no smoothing applied..
You can see how much bass Audyssey took away in the range 15-32 Hz and 75-120 Hz, for the sake of a much smoother response. To me it's a good thing and sound better to me, but to bassoholics, that could be bad.