Electroacoustics. Simulators of human head and ear - Acoustic coupler for the calibration of supra-aural earphones used in audiometry1 Scope This part of IEC 60318 specifies an acoustic coupler for the measurement of supra aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz. The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, the acoustic coupler can be used as an objective and reproducible means of measuring the output of supra aural earphones. It can be used for specifying reference

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