(millivolts) The standard professional recording level is +4 dBu which converted to volts is 1.228 V. Most microphones output a maximum of around 30-40 mV. For example, one of the most popular all-purpose microphone, the Shure SM58, has a sensitivity of 1.85 mV 94 dB SPL. What that means is that for a certain acoustical pressure of 1 Pa or 94 dB SPL your microphone will output “x” mV. ( “x” being an arbitrary value, Pa or Pascal being a unit of measure for pressure). It is usually written as “x” mV 94 dB SPL / 1 Pa. If you have ever researched the specifications of one of your microphones you probably came across the sensitivity of your device.
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