What is Hearing Aid Feedback?
Hearing aid feedback is a common, high-pitched whistling or squealing sound. It occurs when amplified sound from the hearing aid’s receiver escapes the ear canal and re-enters the device’s microphone, creating a continuous loop. This unintended cycle is comparable to the screech produced when a microphone is positioned too close to a loudspeaker.
Common Reasons for Feedback
An improper fit of the hearing aid or earmold is a frequent reason for feedback. If the device does not sit snugly, sound can leak out and be picked up by the microphone, initiating the feedback loop. Changes in ear canal shape, due to factors like weight fluctuations or aging, can alter the fit over time.
Excessive earwax or other obstructions within the ear canal are another common cause. A blockage prevents sound from traveling effectively to the eardrum, causing it to reflect back towards the hearing aid’s microphone. This can also affect the hearing aid’s seal, contributing to sound leakage.
Setting the hearing aid’s volume too high can also lead to feedback. Increased amplification pushes more sound into the ear canal, raising the probability of sound escaping and re-entering the microphone. Finding a comfortable listening level can help prevent this issue.
Physical objects positioned close to the hearing aid can redirect amplified sound back into the microphone. This includes items like hats, scarves, or a hand placed over the ear. Such proximity creates a reflective surface, making feedback more likely.
Less Frequent Causes
Physical damage to the hearing aid can result in feedback. Cracks in the tubing or casing, a dislodged microphone, or a compromised receiver can allow sound to leak internally. This internal leakage bypasses the intended sound pathway, leading to unwanted whistling.
Internal circuitry problems within the hearing aid can also cause feedback. These malfunctions might stem from manufacturing defects, faulty wiring, or software issues. Such issues require professional diagnosis and repair.
Practical Ways to Minimize Feedback
Ensuring a proper and snug fit of the hearing aid is a primary step in preventing feedback. Users should confirm the device is inserted correctly and sits securely in the ear canal. If the fit feels loose or has changed, a professional adjustment or a different earmold or dome size may be beneficial.
Regular cleaning of both the hearing aid and the ears can also reduce feedback. Removing debris and earwax from the device’s components, especially the sound output and microphone ports, helps maintain optimal function. Professional earwax removal can prevent sound obstruction if buildup in the ear canal is a concern.
Adjusting the hearing aid’s volume can sometimes resolve feedback. Lowering the volume slightly can decrease the likelihood of sound leakage and subsequent re-amplification. This is useful in quieter environments where high amplification may not be necessary.
If feedback persists after trying these steps, consult an audiologist or hearing aid professional. They can diagnose issues, perform repairs, or refit the device for proper function. Regular check-ups with a specialist contribute to the effective performance of hearing aids.