Normalize a measurement to a reference curve

Hi John, thanks for your great support. I have initiated a monthly contribution in support of your efforts.

My question is perhaps outside the normal use of REW. I am trying to measure a microphone response. I would like to first measure the speaker response at a given position using my calibrated measurement microphone, then use that response to "correct" the response of the test microphone to compensate for the non-flat response of the speaker. So for example, if I set a reference level at 1khz, and the response of the speaker is down 5db at 100Hz, then the correction curve will boost the measured mic response by 5 dB at 100Hz. I'm wondering how best to generate this correction curve. One thought was to generate a special soundcard calibration that includes the speaker? Not sure if this is practical. Another is to use Trace Arithmetic, but I did play around with that and was not able to come up with a suitable correction curve. Wondering if you have any suggestions? Thanks.

Thanks for this. So just to walk through the procedure, I took a measurement of the speaker at a given position, determined the 1kHz response, subtracted this from the trace to give an EQ curve that was 0 dB at 1kHz, then measured the response at the reference position and used |A|/|B| to equalize the response to compensate for the speaker response. Attached is a chart showing the response, which is very flat since I used the same microphone in this case for both measurements. I am happy with the result - does this make sense to you? Thanks.