6.53  free-field sensitivity. Of an electroacoustic transducer for sound reception, for a specified frequency and a specified direction of sound incidence, quotient of the output open-circuit voltage by the sound pressure in the undisturbed plane progressive free field. Unit, volt per pascal (V/Pa).

Annotation              Root-mean-square voltage and sound pressure are usually specified. If the load impedance is other than that of an open-circuit, the load impedance is specified.

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