Abstract
The frequencies at which resonances occur in an occluded ear canal were measured over a range from 100 Hz to 20 kHz using ear simulators (Zwislocki, 1970) and a constant volume displacement source (B&K 4134 microphone operated with zero bias). Three variables were introduced: earmold bore, ear-canal length, and eardrum impedance. Mid-frequency resonance frequencies (1000 to 3000 Hz) were found to be primarily functions of the reactance of the load presented to the source by the occluded simulator. Resonances at frequencies between 9 and 13 kHz were related to ear canal length. Ear canal volume or diameter affected resonances on the basis of their contribution to the input impedance of the simulators. Major resonances also occurred at frequencies related principally to the source-to-eardrum distance (independent of impedance).
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