Deviates from RTCA DO-214A section 2.6.2.1 a. and b. by using a Sound Pressure Level of 104 dB SPL if the microphone is linear (within 1 dB from the linear approximation) and if the frequency responses curves in standard conditions are identical (within 1 dB) at both 104dB SPL and 94dB SPL levels.
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