With both Audyssey and Dirac you must set the target curve to something appropriate for you room, and/or limit the EQ range to low frequencies only, otherwise you can't expect very good results with either.
Some comparisons were done on these forums and little actual measurable proof was found regarding the supposed superiority of Dirac over Audyssey.
From an interface point of view, Audyssey is more cumbersome to use if you want to create the same target curve you would have created with Dirac, but the cumbersomeness of Audyssey can be mostly solved with the 200$ PC app. With the 20$ android/apple app (instead of the 200$ PC app) you can do mostly the same things, but could be very annoying to use if you want to re-calibrate often or experiment frequently with different target curves.
Some comparisons were done on these forums and little actual measurable proof was found regarding the supposed superiority of Dirac over Audyssey.
From an interface point of view, Audyssey is more cumbersome to use if you want to create the same target curve you would have created with Dirac, but the cumbersomeness of Audyssey can be mostly solved with the 200$ PC app. With the 20$ android/apple app (instead of the 200$ PC app) you can do mostly the same things, but could be very annoying to use if you want to re-calibrate often or experiment frequently with different target curves.
I'm not sure what's Dirac's default target curve? But if it's anything half-decent, that could account for the advantage over Audyssey. Different target curves would pretty much always sound different, even within he same EQ system. I wouldn't judge a system by it's "out of the box" performance if you intended to perform any of the rather necessary tweaking, which mostly include setting up an appropriate target curve.
