In a previous paper, a circumaural earphone that was intended to improve the reliability of auditory threshold measurements was described. This paper is concerned with its evaluation using the results from tests on 100 subjects. The test-retest variances at 1,3,6, and 8 kHz for the circumaural and supra-aural assemblies are compared. At 6 and 8 kHz, the “within-ear” variances for the circumaural assembly are 4.8 and 8.8 dB2, respectively, and are significantly smaller than the corresponding values for the supra-aural device. At 1 and 3 kHz, the reliability is substantially unchanged. It would seem, therefore, that the use of the circumaural earphone will increase the accuracy of auditory-threshold determinations high frequencies.
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Atherley et al. (1967) studied this question.