In another thread there was some discussion of matching levels for test tracks, and the topic of how to measure levels came up, so I tried a quick comparison. The phone was balanced on top of the UMIK, so it's mic was only about a centimetre away from the UMIK's capsule:
In a quiet room I get:
REW+UMIK-1+calibration file: 36.8dB(A)
Audiotools iOS app on iPhone 11 pro: 27.5dB(A)
iNVH iOS app on iPhone 11 pro: 17.5dB(A)
And with some pink noise playing:
REW+UMIK-1+calibration file: 80dB(A)
Audiotools iOS app on iPhone 11 pro: 68.8dB(A)
iNVH iOS app on iPhone 11 pro: 57.8dB(A)
Question 1: Is it safe to assume the REW+UMIK-1 is correct?
Question 2: How can these results be so different? They're all A-Weighted, Hann windowed, on a very standardised device. Am I doing something wrong?
In a quiet room I get:
REW+UMIK-1+calibration file: 36.8dB(A)
Audiotools iOS app on iPhone 11 pro: 27.5dB(A)
iNVH iOS app on iPhone 11 pro: 17.5dB(A)
And with some pink noise playing:
REW+UMIK-1+calibration file: 80dB(A)
Audiotools iOS app on iPhone 11 pro: 68.8dB(A)
iNVH iOS app on iPhone 11 pro: 57.8dB(A)
Question 1: Is it safe to assume the REW+UMIK-1 is correct?
Question 2: How can these results be so different? They're all A-Weighted, Hann windowed, on a very standardised device. Am I doing something wrong?