reciprocity parameter

6.60  reciprocity parameter. 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 (transmitting current response) 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 (transmitting voltage response) of the transducer acting as an emitter of sound.