Impact of "Standard" Earmold on RECD Output from a moderate-gain behind-the-ear hearing aid was measured in HA-1 and HA-2 couplers. For the HA-1 coupling, a standard full-shell earmold with #13 tubing throughout was used. The results suggest that when this earmold configuration is used, the gain and output assumed from HA-2 specifications may not be realized ... Research Article
Research Article  |   March 01, 1995
Impact of "Standard" Earmold on RECD
 
Author Affiliations & Notes
  • Todd A. Ricketts
    The University of Iowa, Iowa City
  • Ruth A. Bentler, PhD
    The University of Iowa, Iowa City
    University of Iowa, Department of Speech Pathology and Audiology, 121B WJSHC, Iowa City, IA 52242-1012
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Research Articles
Research Article   |   March 01, 1995
Impact of "Standard" Earmold on RECD
American Journal of Audiology, March 1995, Vol. 4, 43-45. doi:10.1044/1059-0889.0401.43
History: Received February 17, 1994 , Accepted April 25, 1994
 
American Journal of Audiology, March 1995, Vol. 4, 43-45. doi:10.1044/1059-0889.0401.43
History: Received February 17, 1994; Accepted April 25, 1994

Output from a moderate-gain behind-the-ear hearing aid was measured in HA-1 and HA-2 couplers. For the HA-1 coupling, a standard full-shell earmold with #13 tubing throughout was used. The results suggest that when this earmold configuration is used, the gain and output assumed from HA-2 specifications may not be realized in the higher frequency region. Questionnaires sent to all U.S. earmold manufacturers indicated that only one of those manufacturers considered a “standard” earmold to be one incorporating a “horn” effect in the canal portion of the mold; over 70% of the manufacturers reported inserting tubing to the end of the canal portion as a standard procedure. Measures of real-ear-to-coupler differences (RECD) should be obtained with consideration for this earmold effect.

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