Hello. I have Onkyo TX-NR818 and a problem with harsh sounding highs after Audyssey calibration. I've tried different Audyssey mic (I had it for a day only, so cannot try anything more with it) and the results was much much better, so I am dealing with Onkyo warranty currently about replacing the mic.
But, when trying to find what is happening I did some measurements, and there are some very strange things happening that I cannot explain just by defective mic. Here is the gpaph of electrical response from receiver: http://farm9.staticflickr.com/8213/8303906597_5c93e4f428_o.png
This is the measurement of the center channel that was detected as 50 Hz, and receiver set the crossover at this position. I reset it back to full-range to see what Audyssey does in isolation without receivers HPF more clearly. As the 50 Hz is detected as the lowest speaker frequency and Audyssey is not supposed to correct bellow that frequency, the graphs with and without Audyssey should match below this frequency, but there is a boost of more than 10 dB below 50 Hz.
Do you think the defective mic. could make the Audyssey to this misbehavior somehow? If not, what could be the reason?