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- Oct 2018
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www.shure.com www.shure.com
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If the SM58 noise floor is calculated at room temperature, the voltage output is 0.00000032 volts.
This is equal to -130 dBV. The SM58 Vocal Microphone Specification Sheet says:
Sensitivity (at 1,000 Hz Open Circuit Voltage) –54.5 dBV/Pa (1.85 mV)
At this sensitivity, the self-noise would be 94 - (-54.5 - -130) = 19 dB SPL, which is pretty typical and certainly not "lower than can be typically measured".
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