Earcanal Pressure Generated by Circumaural and Supraaural Earphones

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Abstract
Hearing thresholds of 4 subjects were measured at 9 audiometric frequencies from 0.125 to 8 kcps with a probe microphone placed in the external ear. The earcanal response curves of 3 circumaural and 2 supraaural earphones coupled with a group of 10 subjects were measured over a 0. 2- to 15-kcps frequency range. The 5 groups of earphone response curves have much in common with one another and with curves of earcanal pressure generated by a free sound field, using the same group of subjects; there are also significant differences. Intrasubject range varies from 0. 2 to 10 dB, depending on earphone type and frequency. It is suggested that existing earphone systems, though well-adapted for speech communication, may not provide ideal coupling for more-exacting applications.

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