And I wouldn't stop pushing Onkyo on this issue either. Whileat least for folks who use subs, it's not likely to be a huge problem, anybody running full range with a 10 dB boost over a full octave below the minus 3 dB point (even with room support) could foreseeably damage speakers if they play loud.
Thanks for supporting.
I do use the sub, and always set speakers to 80 Hz, but even with this setting the intermodulation distortion of high frequencies was so boring, that took me to investigation. I already described even before I started the measurement that I hear loud vibrating high frequencies when I turn on Audyssey. It boosts highs to some extent too, but this alone is not telling why it sounds harsh and distorted with the signs of clipping. This low frequency boost is describing everything I hear, this is common that boost in this range produce intermodulation, increases chances to get into clipping and basically it is how it sounds - harsh and vibrating, and distorted sounds are known to be perceived even more loud than they are.
So, it is a huge problem even when the sub is present, while setting the crossovers higher evens the sound a bit, it still doesn't make it good, it still sounds much worse than without Audyssey in the same conditions, except the killed room resonances. When the sub is not present - I wouldn't even want to think about what could happen with speakers on high volumes. And for people who have speakers that have -3 dB point at 80 Hz and above - they also cannot escape that by moving crosses higher. And I have such speakers at surrounds!