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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Insertion gain measurements using two low-powered analogue hearing aids.

Differences between insertion gain measurements and coupler measurements were investigated using two different hearing aids, to assess the accuracy of hearing aid fitting methods which involve the use of real-ear-to-coupler differences (RECDs). The hearing aids used were the NHS BE19 and the Lavis X11. They were allocated alternately to 80 new adult hearing aid users, and insertion gain measurement was carried out with the allocated aid on all subjects, and with both hearing aids on 36 subjects. Coupler measurements were also carried out with both hearing aids, at two different gain settings. Comparison of the coupler measurements and the insertion gain measurements suggests that the differences in insertion gain produced by different hearing aids cannot be predicted accurately from the differences in coupler gain measurements produced by the same aids. Although the use of RECDs measured using insert earphones may accurately predict the real-ear performance of some models of hearing aid, this method may not produce equally satisfactory results with other models.[1]


  1. Insertion gain measurements using two low-powered analogue hearing aids. Norman, M., James, P. British journal of audiology. (2000) [Pubmed]
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