| Definition: | for an electroacoustic transducer that is linear, passive and reversible, principle according to which:
a) the relation between the voltage sensitivity of the transducer functioning as a receiver of sound (e.g. a microphone), and the sensitivity to current of the transducer functioning as an emitter of sound, and
b) the relation between the current sensitivity of the transducer functioning as a receiver of sound (e.g. a microphone) and the sensitivity to voltage of the transducer functioning as an emitter of sound depend only on the geometry of the transducer, the frequency, and physical properties of the medium
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