The Earmold

The ear mould is an important component of your BTE instrument. It connects the hearing instrument to your ear. The ear mould is shaped for each customer individually. The particular form of the ear mould depends on the anatomy of its wearer.

Besides the hearing instrument itself, it is important because it fulfils multiple functions for acoustics and better hearing.

One of the most important tasks of the ear mould is to amplify the transmitted acoustic sound and noise to the eardrum. It also improves the positioning and hold of the hearing instrument behind the ear.

An important aspect of the ear mould is to seal the auditory canal. This acts as a gasket and prevents acoustic feedback.

Feedback occurs because some of the sound amplified by the hearing aid is sent outwards from the hearing aid receiver, "loudspeaker" then picked up again by the hearing aid microphone. The sound is then re-amplified and sent outward and once again picked up by the microphone. This becomes an infinite loop, creating the tonal squeal that can also be heard by other people.

Getting the right fit for your ear mould is one way to prevent feedback. There are different forms and types of ear moulds. You and your hearing health care provider will have to determine exactly which ear mould is best for you.

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