for a reciprocal electroacoustic transducer, at a specified frequency:
a) quotient of the voltage sensitivity of the transducer functioning as a receiver of sound (e.g. a microphone) by the sensitivity to current of the transducer functioning as an emitter of sound; or
b) quotient of the current sensitivity of the transducer functioning as a receiver of sound (e.g. a microphone) by the sensitivity to voltage of the transducer functioning as an emitter of sound
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