A. Quality ControlElectroacoustic measurements should be performed according to the ANSI-S3.22 (ANSI S3.22-1996b or current standard) to determine whether the hearing aids meet their intended design parameters. Coupler measures of gain, frequency response, maximum output, battery drain, and distortion should conform to the published manufacturer’s specifications (within stated tolerances) for the given brand and model. It is strongly recommended that the performance of the hearing aids also be measured according to the ANSI-S3.42 (ANSI S3.42-1992 or the current standard). This standard provides guidance for evaluating hearing aids in a test box using broadband signals. For example, the presence of an irregular frequency response at the higher input levels (80–90 dB SPL) may suggest the presence of intermodulation distortion (Revit, 1994). If the electroacoustic performance of the hearing aids does not adhere to the ANSI S3.22-1996 (ANSI 3.22-1996b) or current standard, they should be returned to the manufacturer for adjustment or replacement.
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