I ordered the Dayton iMM-6C not only, but also because of the Wiim Ultra Auto room calibration.
View attachment 424565
According to the calibration file, it only has an error of + or - 0.5db in the range from 40 to 16000 Hz, i.e. a total of 1db max.
I specified the correction range from 150 to 15 khz.
The autocorrection is clearly better than with the built-in micro of the Google Pixel 8 Pro, but still not as optimal as with other programs. But it is very useful as a basis for further adjustment, whereby I find Flat the most useful, because B&K and Harman Curve get a small belly from the autocorrection, which is omitted with Flat.