Notes about using Dolby PLII AVR's
This came up in another thread, and got me thinking.
I had noted earlier when i did Audyssey runs, that the PLII channels had longer distance settings than they should, but contributed it to the processing of PLII.
They should be 1.8 meters(6 feet), but Audyssey set them to 6.9 meters(22 feet).
Not only that, but the distance setting was maxed out! If i set it longer, it reverted back to 6.9.
And in the 7200 manual, i found the reason, last line under distance, the difference can not be more than 6 meters.
Lately several others had the same "problem", wich let me to check further. I did a Audyssey Pro, the other day, and here you can see the REAL distance setting Pro got from those channels. Look at left and right surround top:
Pro set it to 15 meters!!! (49 feet).
So i fired up REW and used the timing loop, to see the delay. Red is 7200 center channel for reference, blue is said channels in stereo, and green is in PLII mode:
So compared to stereo, there is more than 30ms delay in PLII !
This means that even if you run Audyssey in PLII, and never use any other mode, Audyssey is still not able to correct it enough.
This can't be good?