I have run Audyssey perhaps a dozen times in my room now and if I place the mike at the same locations each time I get pretty consistence results. What I find interesting is that if I alter the mike's locations to even a small degree I get rather dramatic differences with some settings.
For background I have a fairly easy room to work with (I believe) and it even has some acoustical treatment. Seating consists of four chairs all in a row.
The speaker distances always come back exactly the same distance and all of the matching speakers the exact same distance away (such as left and right). Also the levels are exactly the same each run. Ranging from 3.0- to 12.00-. So you are saying what's the dramatic differences?
I'm using my front speakers' built-in subs for my subwoofer and I have been setting their volume by sight... using the tiny volume knob. Well I decided to volume check them and found they were off by 3 decibels or so (one was louder than the other). I adjusted them to be the same level and ran Audyssey again.
This time I lowered the mike a couple of inches (within an inch or so of the listening level) and weighted the eight passes a little more towards the center of the listening area.
As expected it lowered the subwoofer's setting a decibel or so and the distances and levels were exactly as before. However the crossovers were way different. Before there were set to...
90 - Fronts
90 - Center
60 - Surrounds
60 - Rear surrounds
This time they were set to...
Full - Fronts
90 - Center
Full - Surrounds
Full - Rear surrounds
Now outside of the rear surrounds Full sounds Ok to me but the real question or interest is how does Audyssey come up with the varying settings? Or better yet presuming Audyssey is correct on each run and the difference is solely based by the mike location how do we determine which locations to use for the eight scans?
In reality I don't think the end results are going to sound that different
but I just find it hard to say I have run Audyssey the best way I can and that's that... it always seems like placing the mike in different locations might lead to better results.
Which leads to two things.
I guess you need to spent time listening after each run and determine which you prefer and since they all sound great to me I guess (again) the end result is very close. Secondly it would be very nice if Onkyo gave you the ability to store two (even three) sets of settings so you could compare them easily!