Tulip domes for Phonak devices
Quick answer
Phonak uses the Phonak dome range, including the Vented 4.0 fitting. A tulip dome gives moderate venting and suits a middle position when an open dome gives too little gain and a closed dome feels blocked. Dome fittings are not interchangeable between manufacturers, so a dome made for another brand will not seat correctly on a Phonak receiver.
Which dome fitting does Phonak use?
Phonak ships the Phonak dome range, including the Vented 4.0 fitting, across Audeo Marvel, Paradise and Lumity. That fitting is the part of the specification that decides whether a replacement dome will work, and it is not the same as the fitting used by any other manufacturer.
Phonak uses two receiver fittings that look similar and are not compatible. SDS 4.0 and SDS 5.0 are the commonest ordering mistake in this brand, so check the part number printed on the receiver you are replacing rather than the model name of the aid.
Phonak uses the Phonak dome range, including the Vented 4.0 fitting, and fittings are not shared between makers.
| Manufacturer | Dome fitting | Common models |
|---|---|---|
| Phonak | the Phonak dome range, including the Vented 4.0 fitting | Audeo Marvel, Paradise and Lumity |
| Oticon | the Oticon dome range, including double vent domes | the Oticon receiver in canal range |
| GN Resound | the GN Resound dome range, in open, tulip and power styles | Vivia, Nexia, Omnia, ONE and Quattro |
| Jabra Enhance | the GN dome range, shared with GN Resound in several fittings | Enhance Select 300, 500 and 700 |
| Signia | the Signia dome range | the Signia Pure range |
| Starkey | the Starkey dome range | the Starkey receiver in canal range |
| Widex | the Widex dome range | the Widex receiver in canal range |
Is a tulip dome the right style?
Style is a separate question from fitting. The fitting decides what will physically attach to your Phonak receiver; the style decides how the dome behaves once it is on. The trade-off is venting against gain: a heavily vented dome sounds natural and limits how much amplification is possible before feedback, and a sealed one does the opposite.
A tulip dome gives moderate venting.
| Style | Venting | Suits | What it costs you |
|---|---|---|---|
| Open dome | Maximum | Good low-frequency hearing with loss concentrated in the high frequencies. | The most natural own-voice sound and the least occlusion, but the least usable gain before feedback. |
| Tulip dome | Moderate | A middle position when an open dome gives too little gain and a closed dome feels blocked. | More retention and more gain than an open dome, with some occlusion returning. |
| Closed dome | Minimal | Loss that extends into the lower frequencies, where low-frequency sound needs to be kept in the ear. | More available gain and better low-frequency delivery, at the cost of a blocked feeling and a boomier own voice. |
| Power or double dome | Sealed | The most amplification a dome fitting can support before a custom earmould is needed. | The most gain and the most occlusion. Frequently the point at which a custom mould becomes the better answer. |
Getting the size right
The correct size is the one that is comfortable and stays in place, and there is no way to determine it except by trying it. A dome that is too small works loose during the day and lets amplified sound escape, which causes feedback; one that is too large is uncomfortable and makes the ear feel blocked.
The two ears frequently take different sizes. Ear canals are not symmetrical and this surprises people constantly. If your device was fitted professionally, the size chosen at that fitting is the one to reorder and it is usually printed on the packet.
Common questions
- Will domes from another brand fit my Phonak hearing aids?
- No. The fitting that attaches a dome to a receiver differs between manufacturers and frequently between model generations from the same manufacturer. Phonak uses the Phonak dome range, including the Vented 4.0 fitting. A dome that nearly fits does not seat properly, which changes the acoustics and can let the dome come off in the ear canal, so match the part to your device rather than to a size.
- How often should I change Phonak domes?
- Commonly every one to two months, which is a rule of thumb rather than a manufacturer schedule. The signals are a dome that has gone stiff or discoloured, one that has split, or one that no longer stays in place. Domes are inexpensive consumables, so changing them more often than strictly necessary costs very little and prevents feedback.
- Are third-party domes as good as original parts?
- For a silicone tip the difference is usually small, and third-party parts are considerably cheaper. What matters far more than who made it is whether the fitting is genuinely correct for your device. Where an original part is available at a sane price it is the safer choice, particularly for anything that seats into the receiver itself.
- Why does my Phonak device whistle?
- Feedback happens when amplified sound escapes the ear canal and re-enters the microphone. A dome that is too small, split, or not pushed fully onto the receiver is the commonest cause and the cheapest to fix. Check the dome before assuming the device has a fault, and check that it is genuinely the right size rather than merely the one you have always used.
- What size dome do I need?
- The one that is comfortable and stays put, which cannot be worked out from a chart or from looking at your ear. Most people arrive at it by trying two or three sizes, and many need different sizes in the two ears. If the device was fitted professionally, the size chosen at that fitting is recorded and is usually printed on the packet you were given.
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Last updated 2026-09-17.