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The Acoustical Effect of Various Factors on the Frequency Response of a Hearing Aid

An experimental project on a multiple-channel bandpass filter for stringed musical instrument timbre enhancement has provided some useful design data for a wide range of center frequencies with low-cost quad operational amplifier circuits. The apparatus has never been finished in a final cosmetic form, but the results of experimental breadboards may be of interest to audio technicians for related multiple-channel audio filters.

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JAES Volume 22 Issue 5 pp. 329-334; June 1974
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