S.I. unit of electric sensivity is
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The sensitivity of a microphone is usually expressed as the sound field strength in decibels (dB) relative to 1 V/Pa (Pa = N/m2) or as the transfer factor in millivolts per pascal (mV/Pa) into an open circuit or into a 1 kilohm load. The sensitivity of a loudspeaker is usually expressed as dB / 2.83 VRMS at 1 metre.
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