base on these links:

they all say that sensitivity is reported in RMS but this link suggests:

One last very confusing piece of this comparison is the inconsistent usage of peak and rms levels between digital and analog microphones. The microphone’s acoustic input levels in dB SPL are always rms measurements, regardless of the type of microphone. The output of analog microphones is referenced to 1 V rms, as rms measurements are more commonly used for comparing analog audio signal levels. However, the sensitivity and output level of digital microphones are given as peak levels because they are referred to the full-scale digital word, which is a peak value. In general, this convention of using peak levels to specify the output of digital microphones must be kept in mind when configuring downstream signal processing that may rely on precise signal levels. For example, dynamic range processors (compressors, limiters, and noise gates) typically set thresholds based on rms signal levels, so a digital microphone’s output must be scaled from peak to rms by lowering the dBFS value. For a sinusoidal input, the rms level is 3 dB (the logarithmic measure of (FS√2) below the peak level; this difference between rms and peak may be different for more complex signals. For example, the ADMP421, a MEMS microphone with pulse-density-modulated (PDM) digital output, has a sensitivity of –26 dBFS. A 94 dB SPL sinusoidal input signal will give a –26 dBFS peak output level, or a –29 dBFS rms level.

that sensitivity is reported in peak voltage not RMS. which one is correct?

  • $\begingroup$ The part you quoted says digital mics are measured as peak and analog mics as RMS. $\endgroup$ – Justme Feb 19 at 17:03

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