Compatible partsPhonak Audéo Infinio Ultraparts and accessories
Genuine domes, wax filters and accessories for the Phonak Audéo Infinio Ultra (SDS 4.0 and EasyGuard platform). Choose your exact model below to see what fits.
- SDS 4.0 and EasyGuard platform
- 3 compatible parts
- Genuine OEM
- Fast US shipping
Compatible domes
SDS 4.0 and EasyGuard domes that fit the Phonak Audéo Infinio Ultra — fits every model in the family.
PhonakIn StockPhonak SDS 4.0 Domes (Marvel / Lumity / Paradise / Infinio) - 10 Per Pack
Phonak SDS 4.0 Domes - Compatible with Phonak 5.0 and 6.0 receivers Available in Open, Closed, Vented, and Power styles 10 domes per pack Medical-grade silicone material Compatible Hearing Aids Phonak: Audéo Infinio, Infinio Sphere, Lumity (L-R, L-RL, L-RT), Paradise, Marvel Unitron: Moxi Smile, Moxi Vivante, Moxi Blu Important: These domes are NOT compatible with older Phonak models (Audéo B, V, Q series) which use the xReceiver system.
$9.99
PhonakIn StockPhonak EasyGuard Vented Domes - 8 Per Pack
Patented EasyGuard™ technology preferred by 68% of users over traditional domes in a 4-month clinical trial at the Phonak Audiology Research Center (PARC). Compatible with Phonak Audéo Infinio and Audéo Sphere Infinio hearing aids Features a patented sound-transmitting membrane that seals and protects the receiver from earwax No wax filter replacement needed - simply wipe the dome clean with a dry cloth Equivalent acoustic performance to traditional domes - no sound quality compromise 8 domes per pack Clinical Study Results In a 4-month home trial conducted at the Phonak Audiology Research Center (PARC), experienced hearing aid users evaluated EasyGuard domes: 68% preferred EasyGuard over their traditional domes 61% reported spending less time cleaning earwax from their hearing aids 90% found EasyGuard as comfortable or more comfortable than their own domes 79% would recommend EasyGuard to others 58% reported improved overall satisfaction with their hearing aids Source: Sanchez, C., & Adler, M., Phonak Field Study News, October 2025 Why EasyGuard? Earwax buildup is a leading cause of hearing aid problems - 38% of service cases at clinics are resolved simply by cleaning or replacing wax filters. EasyGuard's patented membrane creates an extra barrier between your ear canal and the receiver, dramatically reducing maintenance needs. Sound-Transmitting Membrane: Patented sealed membrane protects the receiver while maintaining full sound quality Simplified Maintenance: No tiny wax filters to replace - ideal for users with dexterity or vision challenges Dual Protection: CeruStop filter can remain in place as backup protection when changing domes Proven Durability: Reliable performance throughout 4-month clinical trial Natural Sound: Vented design for comfortable, natural sound quality with no acoustic compromise Compatible Hearing Aids Phonak Audéo Infinio Phonak Audéo Sphere Infinio
$40.00
Compatible wax filters
Wax guards that protect the receiver on your Phonak Audéo Infinio Ultra — fits every model in the family.
This is a rechargeable model — no disposable batteries to buy. The domes above are the parts you'll replace as they wear.
- Genuine partsOEM-quality, no knock-offs
- Fast US shippingShips quickly within the US
- Easy returns30-day hassle-free returns
- Expert supportReal hearing specialists
Other Phonak Audéo Infinio Ultra parts
Also compatible with this platform — not stocked at HearingTracker yet.
Receiver/Speaker Wire
- Phonak and Unitron Receivers 6.0
Bluetooth Wireless Accessories
- Partner Mic
- Remote Control
- Roger On iN v2
- TV Connector
How to choose the right domes
Match the size
Domes are sized in millimetres (typically 6–12 mm). Use the same size your audiologist fitted — too small whistles, too large feels tight.
Match the style
Open domes keep the ear canal ventilated, generally for mild to moderate loss; closed and power domes seal more sound in, generally for moderate loss or worse. Tulip and double-vent styles sit in between.
Replace every 2–3 months
Swap domes when they discolour, stiffen or tear. Fresh domes keep sound clean and prevent earwax reaching the receiver.
When to change your wax filters
Change every 4–8 weeks
Replace a wax guard as soon as sound becomes weak, muffled or cuts out — that usually means the filter is clogged, not the hearing aid failing.
Always fit a fresh guard
Use the removal tool to pull the old filter, then press in a new one. Never reuse a guard — it's the cheapest part protecting the most expensive one.
Keep spares on hand
Filters are the most common reason a hearing aid goes quiet. A spare pack in your kit means a 30-second fix instead of a clinic visit.
Not sure which dome size you need?
The Dome Finder walks you through it by brand and model.
Frequently asked questions
What domes does the Phonak Audéo Infinio Ultra use?
The Phonak Audéo Infinio Ultra uses SDS 4.0 and EasyGuard domes. Available styles include Cap 4.0, Open 4.0, Power 4.0 and Vented 4.0. Match the size (in millimetres) and style your audiologist fitted — it's usually printed on your current dome. Not sure which to pick? Send us a photo and we'll match it.
What wax filters does the Phonak Audéo Infinio Ultra use?
The Phonak Audéo Infinio Ultra uses Cerustop Wax Filters (shown in the Compatible wax filters section above). Each guard comes on a dual-ended tool — pull the old one out of the receiver and press a fresh one in, about 30 seconds per aid.
How often should I replace the domes and wax filters on the Phonak Audéo Infinio Ultra?
Replace the domes every 2–3 months — sooner if one discolours, hardens or tears — and change the wax filters every 4–8 weeks, or as soon as an aid sounds weak or muffled. Both take under a minute at home.
Is the Phonak Audéo Infinio Ultra rechargeable, or does it use batteries?
The Phonak Audéo Infinio Ultra is rechargeable — it charges in its case rather than taking disposable batteries, so there are no batteries to buy.
Will these parts fit my Phonak Audéo Infinio Ultra?
Yes. The Phonak Audéo Infinio Ultra comes in 2 versions (R and Sphere), and every part on this page is matched to the SDS 4.0 and EasyGuard platform they share. Domes and wax filters fit all of them; pick your version above for the right batteries and charger. Want us to double-check before you order? Just send your device details.