Fifth: If the user does not wear it properly, the hearing aid forms sound feedback and produces a buzzing sound called howling.
The so-called external hearing aid whistling refers to the whistling caused by non-hearing aid internal factors.
If the contact part of the hearing aid and the ear canal is not well integrated and the sealing density is not enough, the amplified sound will be easily leaked out, reflected in the external auditory canal, and then amplified again by the microphone and amplifier, and so on until it reaches The limit value of the sound output of the hearing aid finally forms the whistle of the external hearing aid.
Link： What's wrong with the buzzing of hearing aids?
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