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6.57  sensitivity to current; transmitting current response. Of an electroacoustic transducer for sound emission, for a specified frequency, quotient of the sound pressure at a specified distance from the acoustic center, and in a specified direction, by the current flowing at the electrical input terminals. Unit, pascal per ampere (Pa/A).

Annotation              When the effective acoustic center of the transducer cannot be easily determined, the distance should be measured from the reference point of the transducer.

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