Earmould modifications for wide-bandwidth, flat response hearing aid coupling systems for use in audiological measurements

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Subminiature hearing aid earphones are increasingly being used to perform audiological testing for both reseach and clinical purposes. This paper gives designs for coupling systems which allow the earphones to achieve wide bandwidths, flat frequency responses, and high output powers, when measured at the average eardrum. One of the designs has a response that is flat to within ± 1.5 dB between 35 and 6600 Hz and produces in excess of 120 dB SPL at the average eardrum. A second design produces over 128 dB SPL at the eardrum but is only flat to 5000 Hz. The sections of the paper dealing with the design of acoustic horns and selection of dampers are written in a tutorial manner to assist those performing earmould modifications for other purposes.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalAustralian Journal of Audiology
Issue number2
Publication statusPublished - 1983
Externally publishedYes


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