If you wear a Receiver-In-Canal (RIC) or Behind-The-Ear (BTE) hearing aid, you are familiar with the small, flexible silicone tips that sit at the end of the speaker wire and slide directly into your ear canal. These are called hearing aid domes.
While they look like simple, inexpensive pieces of plastic, domes play a massive role in your overall hearing experience. The style and size of the dome you choose directly determines how comfortable the device is, how much natural sound you hear, how powerful the bass tones are, and whether your device experiences whistling (feedback).
This guide explains the three primary styles of hearing aid domes, how to choose the right size, and how to replace them safely.
The Three Main Styles of Hearing Aid Domes
Silicone domes are not one-size-fits-all. They are engineered in three distinct acoustic styles, each designed to manage how air and sound waves travel in and out of your ear canal.
The table below outlines the core acoustic and practical differences between these three styles:
| Dome Style | Physical Appearance | Sound Profile | Occlusion Level | Best Suited For |
|---|---|---|---|---|
| Open Domes | Features multiple triangular holes or vents carved into the silicone skirt. | Natural high-frequency amplification; allows low-frequency bass to escape naturally. | Very Low (No "stuffy head" or boomy voice effect). | Mild high-frequency hearing loss; first-time buyers seeking natural sound. |
| Closed Domes | A solid silicone bell, typically featuring only one or two tiny pinhole vents. | Boosts low-frequency bass and mid-tones; provides a fuller, richer sound. | Moderate (Your own voice may sound slightly louder or deeper). | Moderate hearing loss; users who want stronger speech amplification in noise. |
| Power Domes | A double-layered, solid silicone bell (resembling a double mushroom cap) with no vents. | Maximum amplification across all frequencies; seals the ear canal completely. | High (Strong occlusion effect; blocks almost all natural external sound). | Moderately-severe hearing loss; users experiencing constant whistling (feedback). |
Understanding the "Occlusion" Effect
When choosing a dome, the most important concept to understand is occlusion.
Occlusion is the stuffed-up, boomy feeling you get when your ear canal is physically blocked—similar to how your voice sounds when you plug your ears with your fingers. When your ear canal is sealed, the sound waves from your own voice travel through your jawbone, get trapped inside your closed canal, and echo loudly against your eardrum.
- Open domes prevent occlusion by letting natural sound waves and air pass freely in and out of your ear. Your own voice will sound perfectly natural.
- Closed and power domes cause occlusion because they block the canal. Your own voice will sound deeper, boomy, or like you are speaking inside a barrel. However, they are necessary to trap the amplified sound inside your ear so you can hear soft speech clearly.
How to Find Your Perfect Dome Size
Silicone domes typically come in three standard diameters: Small (6mm–8mm), Medium (8mm–10mm), and Large (10mm–12mm).
To find the right size, you must balance physical comfort with acoustic performance:
- Signs your dome is too small: The hearing aid slips out of your ear easily when you talk or chew; the device whistles (feedback) constantly; the sound feels weak or thin.
- Signs your dome is too large: You feel physical pain, itching, or soreness inside your ear canal after wearing the device for an hour; you have to push incredibly hard to get the device into your ear.
- The perfect fit: The dome should slide into your ear canal smoothly, feel snug and secure, and remain comfortable for a full 8-to-12-hour day of wear.
How to Replace Your Hearing Aid Domes
Silicone domes are disposable accessories. Over time, constant exposure to body heat, skin oils, and earwax will cause the silicone to stretch, harden, yellow, or tear.
We recommend replacing your silicone domes every 4 to 8 weeks to maintain hygiene, comfort, and optimal sound quality.
Step 1: Remove the Old Dome
Hold the speaker housing (receiver) firmly in one hand. With your other hand, grasp the silicone dome by the center collar (not the thin outer skirt) and pull it straight off the speaker stem. It may require a firm tug, as it is designed to snap tightly onto the speaker ridge.
Step 2: Clean the Speaker Tip
Once the dome is removed, use your dry microfibre cloth and cleaning brush to clear any earwax or debris from the exposed metal speaker tip and the white wax guard filter.
Step 3: Snap on the New Dome
Align the central collar of the new dome directly with the speaker stem. Push the dome firmly onto the stem until you feel or hear it "snap" into place over the retaining ridge.
Critical Safety Warning: After replacing a dome, always tug on the silicone skirt firmly before inserting it into your ear. If the dome is not snapped securely onto the speaker stem, it can easily slide off and become stuck deep inside your ear canal, requiring medical removal with tweezers [1].
Clear Verdict: Which Dome Style Suits You?
The best dome style is determined by your specific hearing challenges and personal comfort preferences:
- Choose Open Domes if your hearing loss is mild, you primarily struggle with high-pitched speech clarity, and you cannot stand the stuffed-up feeling of blocked ears.
- Choose Closed Domes if you have moderate hearing loss, struggle to hear speech in noisy environments, and want a richer, fuller audio profile for music and phone streaming.
- Choose Power Domes if you have moderately-severe hearing loss, require maximum volume, and experience constant whistling (feedback) with open or closed domes.
Related Reading
- Learn how to troubleshoot whistling caused by loose domes in our How to Fix Whistling and Feedback Guide.
- Master the daily cleaning steps for silicone domes in our Hearing Aid Cleaning Guide.
- Compare different physical device styles in our Guide to Hearing Aid Types.
Frequently Asked Questions
1. How often should I replace my hearing aid domes?
You should replace your silicone domes every 4 to 8 weeks. However, if you physically see a tear in the silicone, if the dome becomes stiff or discolored, or if it slips off the speaker stem easily, you should replace it immediately.
2. Can I wash my hearing aid domes?
Yes, but only after detaching them from the hearing aid. You can wash silicone domes in warm, soapy water. You must let them dry completely (for at least 12 to 24 hours) before snapping them back onto the delicate electronic speaker. Never get the actual hearing aid or speaker wire wet.
3. What should I do if a dome gets stuck in my ear?
If a silicone dome slides off the speaker and remains stuck inside your ear canal, do not panic, and do not try to remove it yourself with cotton buds, tweezers, or hairpins. Doing so will only push it deeper, potentially damaging your eardrum. Visit an urgent care clinic, walk-in medical center, or ENT doctor immediately; they can safely extract it in seconds using professional tools [1].
4. Why does my own voice sound like I'm in a barrel?
This is called the "occlusion effect." It happens when solid silicone domes (closed or power domes) block your ear canal, trapping the sound waves of your own voice inside your ear. If this is highly bothersome, try switching to a smaller size, a dome with more vents, or an "open dome" style.
5. Can I use domes from a different brand on my hearing aids?
Generally, no. While some domes look identical, the diameter of the internal speaker stems varies slightly between manufacturers (e.g., Sony domes may not fit securely on Lexie or Eargo speakers). Always purchase replacement domes designed specifically for your exact hearing aid brand and model to prevent the dome from slipping off in your ear.
References
[1] Mayo Clinic. "Hearing aids: How to choose the right one." Mayo Clinic Health Information, December 2024. https://www.mayoclinic.org/diseases-conditions/hearing-loss/in-depth/hearing-aids/art-20044116
[2] National Institutes of Health. "Over-the-Counter Hearing Aids." National Institute on Deafness and Other Communication Disorders (NIDCD), May 2023. https://www.nidcd.nih.gov/health/over-counter-hearing-aids