It is not going to be the same for everyone. While it may be true that most people could do worse for letting Audyssey/or Dirac to EQ above the Schroeder frequency, some may benefit from it as it mainly depends on how how the data collected by the mic/positions are reliable for use by the software. According to some experts, such as Dr. Toole, it is sort of hit and miss, so if it is more of a hit, then in theory it may work well. I think Dirac's recommendation is to try to see if it works for you, while Audyssey seems to suggest you should just do it full range.
I wish the scaling on it was better but above 4k the differences are plenty enough to matter. When I compare my measurements with a calibrated UMIK-1 to what Audyssey gets at higher frequencies, it is different enough to make a difference. From my experience, I would only use full range Audyssey correction if you can take after measurements to see what Audyssey has done at higher frequencies.
There is no excuse for the higher end AVRs and Processors from Denon/Marantz to be limited to the stock Audyssey MIC. At these price levels, it should include better, more accurate, MIC/tripod. And while we are at it... a pc app. This is something they need to address opinion.
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