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The goal of a well designed hearing aid is to maximize speech understanding and sound quality. Furthermore, a well designed hearing aid should be able to fit persons with a variety of hearing loss configurations. With these goals in mind, Rickert and colleagues at Starkey Laboratories designed a study to answer the question, “how many independent signal processing channels are required to maximize speech audibility and to match a non-linear fitting formula for a variety of audiograms?” They began with 1156 audiograms and from those they identified 15 representative audiometric configurations. The fifteen audiograms were computationally fit to maximize speech audibility [as quantified by the Articulation Index (AI), ANSI S3:5] and to match targets from the Cambridge non-linear fitting formula using a range of channels varying from 1 to 18. The results, shown in the figure below, demonstrate that moving from 1 to 2 channels provides a statistically significant improvement in Articulation Index (AI), as does moving from 2 to 3 channels and from 3 to 4 channels. Although there is an improvement as the number of channels is increased to 5 or 6, the improvement is not statistically significant. After 6 channels there is no further improvement in AI at all.