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What causes hearing aids to whistle?

April 26, 2017causes hearing aids whistle

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What causes hearing aids to whistle?

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When amplified sound exiting the hearing aid is routed back to microphone, a hearing aid will whistle. This is referred to as “acoustic feedback.” Nearly all hearing aids have the potential for feedback (whistle) if the volume is turned up high enough. Feedback problems are worsened if is leakage around the earmold or hearing aid. Your hearing aid should not feedback when volume is set at a normal listening level.