Feedback can be a very annoying and distracting sound, and it can make it difficult to hear other sounds.

What is feedback in audiology?

Feedback in audiology is the high-pitched whistling sound that can be emitted by a hearing aid when the hearing aid’s microphone picks up its own input, thus re-amplifying itself. 

What is Feedback Test in Hearing Aid?

A feedback test is a procedure that is performed by an audiologist to determine the level of feedback that is present in a hearing aid. This test is typically performed during the fitting process, and it helps the audiologist to adjust the hearing aid settings so that feedback is minimized.

What Causes Acoustic Feedback?

Acoustic feedback is caused when sound waves from the hearing aid’s speaker are picked up by the hearing aid’s microphone. This can happen if the hearing aid is not fitted properly, if the ear canal is too small, or if there is a build-up of earwax in the ear canal.

How to Reduce Feedback in a Hearing Aid

There are a number of ways to reduce feedback in a hearing aid. Some of these methods include:

  • Fitting the hearing aid properly. The hearing aid should be fitted so that the microphone is as close to the eardrum as possible. This will help to prevent sound waves from escaping the ear canal and being picked up by the microphone.
  • Using a smaller earmold. A smaller earmold will help to create a better seal in the ear canal, which will help to prevent sound waves from escaping.
  • Adjusting the hearing aid settings. The audiologist can adjust the hearing aid settings to reduce feedback. This may involve reducing the gain (volume) of the hearing aid, or it may involve using a feedback cancellation algorithm.
  • Using a feedback masker. A feedback masker is a small device that is placed in the ear canal. It emits a sound that is the same frequency as the feedback sound. This helps to mask the feedback sound, making it less noticeable.


Feedback is a common problem that can occur with hearing aids. There are a number of ways to reduce feedback, and the best method will vary depending on the individual. If you are experiencing feedback with your hearing aid, talk to your audiologist. They can help you to determine the cause of the feedback and recommend ways to reduce it.