6.63 random-incidence sensitivity. Of an electroacoustic transducer for sound reception, at a specified location, for a specified frequency, quotient of the root-mean-square open-circuit output voltage due to a succession of sound waves incident with equal probability from all directions, by the root-mean-square sound pressure at that location due to a single such free sound wave in the absence of the electroacoustic transducer. Unit, volt per pascal (V/Pa).
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