So I used the UMIK-1 (with the Apple Lightning-USB adapter), a Dayton iMM-6, and the internal iPad mic. I was unable to use the EMM-6 and the M30 with the iPad as my MOTU Microbook II USB audio interface doesn’t work with the iPad. The actual display in AudioTools is a bargraph, but they come out as smooth curves in REW. To compare measurements, the RTA was stopped and saved as a file, which was then moved to my laptop and imported into REW. The measurements on the iPad were done using the RTA function of AudioTools. Note that the RTA does tend to bounce around a little, so some variation at individual 1/3 octave bands should be ignored. They’re pretty close, with the RTA drooping slightly at the top and bottom (the same effect was observed with the other two microphones). Measurement sweep in REW (green) vs RTA in REW (red)
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