Historical
IEC 60711 Ed. 1.0 b:1981
Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts
Specifies an occluded-ear simulator, intended for the calibration of insert earphones in the frequency range 100 Hz to 10 000 Hz in terms of the sound pressure at the eardrum.
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International Electrotechnical Commission [iec]