The standing wave effect was subtle but positive. I performed all of my listening tests post calibration but prior to making or seeing the measurements. Why or why? Is it trying to emulated the mistaken idea in Audyssey EQ? What is not a good thing is the dip that it inserted in the mid-frequencies. This seems to be some kind of target wave which decided to roll off the two aforementioned room modes further which is a good thing. To see the effect of 'speaker EQ' I turned on that mode ('AccuEQ ON') in addition to standing wave filter: Of course if your room mode is at lower frequency than 63 Hz, then you are stuck. So you could measure your room and dial them down more. Likewise the 130 Hz one could have used 2 to 3 dB reduction.ДЇortunately the filters can be modified after the fact which is a nice benefit over all or nothing systems in these products. While the two peaks were detected correctly, the EQ level that was dialed in was just 1 db! The 105 Hz could have been pulled down good 4 to 7 dB. Lowest frequency is 63 Hz which rules it out for a number of room modes. I went there (sorry no picture) and there are only three filters. There, visually only two changes are there in the two peaks. For this test it doesn't matter as we are just interested in bass frequencies. I wonder if there is an internal calibration for this. We see a pretty sharp drop in high frequency response. This is the results with no eq and with standing wave filters on: This way we are 'hearing' what its internal algorithms are receiving. To check what the auto eq system is performing, I thought I measure the system with all EQ off but using the Onkyo supplied microphone on my laptop. You can selectively turn each on.ДЄll in all, the process worked smoothly and the AVP detected the room noise, set the volumes to something sensible, and found the right number of speakers. There seems to be two subsystems here: an EQ and a room mode (called standing wave) filter. Fortunately there is some indirect mitigation as you see later. Such calibration is fine for single person listening to music or something but may make bass response much worse for other seats in the room. Maybe they are worried about patents or something.

And it is not rocket science to measure multiple points and spatially average them. I was surprised that the calibration was for one seat only! This is a home theater processor. The mic is the dirt cheap puck that comes with the lowest of low end mass market AVRs. I sat through the calibration sounds and I must say, this thing plays more different types of sweeps/noise/ticks than all the systems I have tested combined! Seems like a hodgepodge of different schemes with their own excitation signals. The subwoofer is no longer there and was not used. While the system calibrated both systems, for my evaluation of its accuracy, I focused on the Revel Salon 2 speaker to the left.

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