Dayton Audio OmniMic V2 Precision Measurement System - Manual (Page 21)

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If we equalized the response for flat at the Red position, then at 100Hz that would be fine for both Red and Blue around
100Hz. But Blue would end up with a big peak around 50Hz if it were bumped up as much as would be needed to make
the Red flat.
If we equally weighted the responses from both, we would get the Violet curve as shown below:
Averaging in Omnimic is "power averaging", meaning that peaks shown in dB carry more weight than do dips. This is
good, because peaks in response are more bothersome to sound than dips, so we want those to show stronger in the
curve we plan to correct from. Remember, if there is a peak in our Average curve, then during EQ we will be working to
pull the response down there with the equalizer's response -- peaks in room response become dips in equalizer response
to compensate.
But what if the Blue position is hardly every used, or is usually occupied by someone who doesn't care much about the
sound balance? In that case, we can just use more weighting for the Red curve as we develop our average curve. That
is simply done by introducing more averages from the Red position as for the Blue position. For instance, here is what the
Violet "Average" curve becomes if we used three averages from Red but only one from Blue:
You can see that the Violet curve now becomes a little more like the Red and a little less than the Blue.