Why are my hearing aids whistling?
Hearing aids whistle due to acoustic feedback. This occurs when the sound that’s been amplified by a hearing aid escapes from the ear canal and loops back into the device’s microphone. This creates a feedback loop, which often results in a whistling, squealing, or buzzing sound.
Think of it like holding a microphone too close to a speaker at a concert—it creates that same piercing squeal.
Common Causes of Feedback
There are several reasons why feedback can occur:
Poorly fitting earmolds or domes: If a hearing aid doesn’t sit snugly in the ear, sound can leak out and cause feedback.
Excessive earwax: A blocked ear canal reflects sound back into the aid.
High amplification levels: The more amplification a hearing aid provides, the higher the risk of feedback.
Physical obstructions: Hats, scarves, or hugging someone can momentarily disrupt the placement of the hearing aid and cause feedback.
Improper insertion: Even something as simple as not putting the aid in fully can allow sound to leak out.
How Modern Hearing Aids Combat Feedback
Thanks to advances in digital hearing aid technology, feedback is no longer the nuisance it once was. Modern devices are equipped with:
Feedback cancellation algorithms: These detect and eliminate feedback before it becomes audible.
Phase inversion technology: Some hearing aids use sound waves that are 180° out of phase to cancel out feedback. This is much like how noise cancelling headphones work.
Custom earmolds: These are designed to create a tighter seal, reducing the chance of sound leakage.
Real-ear measurements: Audiologists can fine-tune devices in the ear to reduce the likelihood of feedback based on your unique anatomy.
What You Can Do
If you’re experiencing feedback regularly, it’s worth checking:
Are your hearing aids inserted correctly?
Do your domes or earmolds fit well?
Has your ear canal been checked for wax buildup?
Are your hearing aids due for a service or adjustment?
Talk to Your Audiologist
If feedback becomes persistent or disruptive, don’t hesitate to get in touch. At High Peak Hearing, we can assess your device fit, check your ears, and use real-ear measurement and verification tools to optimise your settings and eliminate that annoying whine.
Final Thought
Acoustic feedback may be common, but it doesn’t have to be something you live with. With the right tools, fit, and technology, your hearing aids should help you hear better—not whistle at you!
