Abstract
In a previous statistical study, Shore, Bilger, and Hirsh found, for 15 clinical patients, that four different hearing aids, each with two different tone settings, did not yield significant differences in speech discrimination in quiet or in noise when test results were based upon four different testing days. In order to explore further whether the lack of significant difference came from a lack of acoustical difference among these hearing aids, response-frequency characteristics were obtained for the four different makes of hearing aids, each with the necessary number of combinations of tone setting, earphone, cord, and insert, to provide both good and bad “fittings” for each of the 15 patients. There are some substantial differences in the frequency response of the various hearing-aid combinations used but only rarely do these differences correspond to differences in test results based upon speech perception with patients. [This study was supported by Grant (B-1854) from the National Institutes of Health (NINDB).]
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