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The maximum SPL reading of a microphone is the maximum sound pressure the microphone can handle before it will distort or fail.
Microphones should not be kept in SPL zones above their maximum rating as this may damage the capsule.
Keep in mind the most RØDE microphones can cope with a sound pressure of 130dB SPL, this is equivalent to a jet engine at 100m or more importantly the threshold of pain, so if you're hurting, so is the microphone!