This issue is intended to provide comprehensive information on the origins and characteristics of acoustic feedback in hearing aids and to discuss its minimization or prevention. Obviously this adds to the overall cost of hearing aids to the dispenser, and anything that can be done to help reduce these returns will ultimately benefit the wearer.
Though specific figures are considered by manufacturers to be proprietary information, industry experts estimate that as many as 10% to 15% of in-the-ear hearing aid products are likely to be returned to the factory within the first 90 days after manufacture for feedback-related problems. Thus dealing with acoustic feedback is still a prevalent problem that plagues clinicians and wearers alike. Suppressing these irritating squealing noises is not easy. The high-pitched whistling of a hearing aid experiencing acoustic feedback is an irritating sound for the hearing aid wearer and for nearby individuals. Acoustic feedback has been described as “whistling,” “howling,” “screeching,” “screaming,” “squealing,” “whining,” “ringing,” “humming,” “buzzing,” “oscillating” and by various other names.
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