The Effect of a Conventional Versus a Nonoccluding (CROS-Type) Earmold upon the Frequency Response of a Hearing Aid
- 1 September 1968
- journal article
- Published by American Speech Language Hearing Association in Journal of Speech and Hearing Research
- Vol. 11 (3) , 638-647
- https://doi.org/10.1044/jshr.1103.638
Abstract
Sound-field Bekesy audiograms were obtained from one experienced hearing-impaired subject wearing an ear-level hearing aid with a conventional earmold and a nonoccluding CROS-type earmold. Comparisons were made to determine the effects of the two different types of earmolds as well as different tubing lengths for nonoccluding CROS-type earmolds. Findings indicate: (1) A nonoccluding CROS-type earmold alters the frequency response characteristics of a hearing aid by markedly reducing the amplification for the low frequencies. (2) The length of tubing has a minor effect compared with that caused by the nonoccluding CROS ear coupler. (3) Sound-field Bekesy audiometry is a reliable and valid tool for assessing changes in the amplifying characteristics of hearing aids.Keywords
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