Skip to Content
Skip to Main Menu
Freephone Hearing Aid Advice
0800 567 7621
Book

Quoted for Phonak Ultra Sphere i90s? Read this first — The Unitron Moxi S-RX 9 does the same job for less

Kimberley Bradshaw - Head of Marketing
Written By:
Kimberley Bradshaw

Head of Online Medical Content

Paul Harrison - Audiology Expert at Hearing Aid UK
Audiologically Reviewed By:
Paul Harrison

Audiology Expert at Hearing Aid UK

Posted: 8th July 2026
Updated and medically reviewed: 8th July 2026 in: Hearing Aid Technology
Phonak Infinio Ultra vs Infinio hearing aids

Phonak Infinio Ultra Sphere vs Unitron Smile Moxi RX Hearing Aids

What's the real difference?  

 

Overview    |    What's actually inside    |    Comparison chart    |    Where Phonak is better    |    Which one is right for you?    |    Key takeaways

 

Latest Hearing Aid UK Update:  08/07/2026

If you've been quoted for a Phonak Infinio Ultra Sphere, ask about this aid too

Buying a premium hearing aid can feel like a big decision, especially when you're not sure whether you're getting the best price for what you actually need. If you've recently been quoted for a Phonak Audeo Infinio Ultra Sphere i90, it's worth knowing that Phonak's parent company, Sonova, also owns Unitron.

Unitron's Smile Moxi RX 9 (launched in June 2026) uses the same AI chip as the Phonak Audeo Infinio Ultra Sphere i90, and it's significantly less expensive.

The two aids aren't identical, but for many people they do a very similar job. We know brand names and model numbers can feel like a maze when you're trying to make a sensible decision, so this article compares these two specific models directly, based on our own HCPC-registered audiologists' hands-on experience fitting both brands.

 

What's actually inside these two aids

In plain terms, both of these aids have an extra chip built purely to help you follow speech in noisy places, like restaurants or family gatherings: one for everyday processing (Bluetooth, streaming, automatic switching between listening environments) and a second, dedicated AI chip called DEEPSONIC.

Sonova launched the Phonak Audeo Sphere Infinio in August 2024; this was its first hearing aid with this kind of dedicated chip. The range also got an upgraded version called the Phonak Audeo Ultra Sphere Infinio in October 2025. Sonova launched the Unitron Smile Moxi RX 9 in June 2026; this is their most recent hearing aid using the DEEPSONIC AI chip.

The hardware in all of these aids is the same, but the software and appearance of the aids are a little different, so they won't look and sound completely identical, just very similar.

The brands describe the features using different terms for the same process; Phonak markets the noise reduction feature as "Spheric Speech Clarity," whereas Unitron's name for the feature is "SoundSonic360."

The trickiest bit tends to be the confusing model names. For Phonak, if you want these features, make sure the model name has the word "Sphere" in it; for Unitron, the model must have "RX" in it. The ones without do not have the DEEPSONIC AI chips.

 

"People often assume the more expensive aid must be the better one, and sometimes that can be true, but not here. These two share the same core technology. What actually matters is a proper assessment of your hearing and your day-to-day listening situations, not the price tag."

Paul Harrison, Audiology Expert & Founder, Hearing Aid UK

Unitron Moxi RXPhonak Infinio Ultra Sphere

Infinio Ultra Sphere i90 vs Unitron Smile Moxi RX 9

Is Phonak worth the extra money?

 

Comparison chart

FeaturePhonak Infinio Ultra Sphere i90Unitron Smile Moxi RX 9
StyleRIC (Receiver-in-Canal, worn behind the ear with a small wire to the ear canal)RIC (Receiver-in-Canal, worn behind the ear with a small wire to the ear canal)
Technology levelPremiumPremium (only the RX models have this chip)
Speech-in-noise chipSpheric Speech ClaritySoundSonic360
RechargeableYesYes
BluetoothYes, up to 8 paired devicesYes, up to 8 paired devices
RogerDirectYesYes
Roger microphone blendingYes, blends Roger mic audio with nearby voicesAs far as we know, but worth double-checking with your audiologist
Colour options76

  

Where Phonak is better

  • Phonak does have one specific extra trick when you're using a Roger microphone: it can blend the sound coming from that microphone with the voices of people sitting right next to you, so you're not just following the person speaking into the Roger mic; you're also picking up on nearby conversation at the same time.

As far as we can tell, this specific setting isn't currently available on the Unitron.  Beyond that one setting, if Roger matters to you (practically speaking, for most people it doesn't), it's worth asking your audiologist to confirm.

 

Which one is right for me?

If you've been quoted for the Phonak i90 purely because you were shown it first, it's worth asking your audiologist to price the Unitron Smile Moxi RX 9 alongside it. If Roger microphones, or the longest available track record, matter most to you, the Phonak is likely still the better fit, and that's a perfectly good reason to choose it.

If you mainly care about strong speech-in-noise performance at a lower price, the Unitron deserves serious consideration. Either way, you're not expected to make this decision alone. The final recommendation should come from a qualified audiologist who has actually assessed your hearing and your day-to-day listening situations, not from a brand name alone.

 

Why two brands, two prices

This isn't unusual. Sonova runs Phonak as its premium flagship brand and Unitron as its value-focused sibling, sharing engineering across both to keep research and manufacturing costs down. If two aids are doing essentially the same job, the price difference is simply worth knowing about before you commit to either.

 

A quick word on impartiality

Hearing Aid UK doesn't manufacture hearing aids, has no affiliation to any brand, and therefore has no reason to steer you towards either brand.

Around 18 million adults in the UK live with hearing loss, according to RNID, and most will encounter this exact "which one do I choose" moment at some point. Our job is simply to lay out what we found, honestly, so you can make a decision that feels right for you, with proper support from someone qualified to give it.

 

Key takeaways

  • Phonak's Infinio Ultra Sphere i90 and Unitron's Smile Moxi RX 9 share the same DEEPSONIC speech-in-noise chip, since Unitron and Phonak are both owned by Sonova.
  • Both are top-tier RIC (receiver-in-canal) aids with rechargeable batteries and Bluetooth connectivity for up to eight devices, but the Unitron is typically priced lower.
  • Phonak markets the shared chip as "Spheric Speech Clarity"; Unitron calls it "SoundSonic360", different names for a similar underlying technology.
  • The main practical difference is Roger microphone blending, only confirmed on the Phonak, plus one extra colour option (seven versus six).
  • A shared chip does not mean identical aids: operating system, app, housing and sound tuning still differ by brand.
  • The right choice depends on individual priorities (Roger mic use, brand track record, or lower price for similar performance), and should always be confirmed with a qualified audiologist rather than decided from a spec sheet alone.

 

Not sure which one suits you?

There's no single "better" hearing aid here, only a better fit for how you actually live and listen, and an honest comparison from our experts.  If you'd rather get similar speech-in-noise performance without paying for the flagship name, the Unitron is a genuinely credible choice.

Either way, the decision doesn't rest on brand names or spec sheets, but a professional hearing assessment from someone qualified to help you find the right fit.

Book a free hearing test with one of our HCPC-registered audiologists, in a local clinic or in your own home, and get honest, impartial advice on which of these two aids (if either) is right for you. Call 0800 567 7621 or book your free hearing test today.

Why Choose Us?

  • FREE Hearing Tests
  • Best Hearing Aids and Prices
  • FREE Aftercare for Life
  • FREE Home Visits
  • FREE Clinic Appointments
  • 200+ Local Audiologists
  • 60 Day Money Back Guarantee
Paul Harrison
Hearing Aid Advisor
Unlike most national retailers we are not owned by any manufacturer, this means we can offer the full choice of all makes and models of hearing aids

Infinio Ultra vs Infinio hearing aids

We'll say this again because it matters: even the most sophisticated hearing aid technology won't deliver proper results if it's not fitted and programmed correctly for your specific hearing loss and preferences.

The difference between a well-fitted Ultra and a poorly-fitted Sphere is far greater than the technology gap between the two models.

We'll take the time to understand not just your hearing loss but your lifestyle, the environments that challenge you, and what you actually need from your hearing aids.

Call 0800 567 7621
- or -
We Can Call You
Request a Callback
A friendly member of our team will call you back.
Or We Can Call You
Please correct any validation errors.
* Unsubscribe at any time. See our Privacy Policy
protected by Badge reCAPTCHA
Written by Kimberley Bradshaw

Meet Kimberley Bradshaw, Head of Online Medical Content

Kimberley Bradshaw is Head of Online Medical Content at Hearing Aid UK, with six years of experience writing about hearing healthcare for UK and US health and wellness publications. Her focus has always been the same: making complex topics feel clear, human, and easy to understand.

✔️ Head of Online Medical Content, Hearing Aid UK

✔️ Medical Content Writer — UK & US publications

✔️ 6 years experience writing in the audiology space

✔️ Member of Tinnitus UK

Audiologically reviewed by Paul Harrison

Meet Paul Harrison, Audiology Expert at Hearing Aid UK

Paul Harrison is an audiology expert at Hearing Aid UK, with over 20 years of experience helping people understand their hearing health and find the right solutions for their needs. He is committed to making audiological advice accessible, honest, and straightforward for everyone.

✔️  Council Member, BSHAA — 2015–2020

✔️  Audiology Expert, Hearing Aid UK

✔️ 20 years of audiology experience

Other hearing aid technology articles you might like...

Phonak Infinio Ultra Sphere i90 vs Unitron Smile Moxi RX 9 Phonak Infinio Ultra Sphere i90 vs Unitron Smile Moxi RX 9
This guide helps you understand whether you actually need the Sphere's additional processing power or if the standard Ultra would serve your lifestyle perfectly well. Plus, comparing the superseded In...
Read More
Rugged Hearing Aids Rugged Hearing Aids
Hearing aids and physical lifestyles have not always been an easy combination. That has changed. We explain what IP68 water resistance actually means, why ATEX certification matters for certain indust...
Read More
How long do hearing aids last? How long do hearing aids last?
Wondering how long hearing aids last? Most modern devices last between 3–7 years, but several key factors can affect their lifespan. Find out what they are and how to get the most from your investme...
Read More
Total Number of Happy Customers

31041
Established Over 10 Years
Reviews.io
Rated: Excellent
Unbiased Hearing Aid Advice You Can Trust

Our specialist service includes:

Free Independent, Impartial Advice
Free Aftercare for Life
Competitive Prices & National Support
60 day Money Back Guarantee - Risk Free
Over 200 Audiologists across the UK

Do not spend hundreds of pounds without getting a second opinion from us.

Please call us on 0800 567 7621

Quote Marks Not only are the prices great, but the service is fantastic! Many thanks to your team.
Jenny Smith - London
Verified Customer
reviews.io logo

What's included in our hearing aid prices?

Full Hearing Test & Examination by a Registered Audiologist
Fitting and Programming of Hearing Aid(s)
All Aftercare and Fine Tuning for Life
Full Manufacturer's Warranty
60 Day Full Money Back Guarantee

Other pages you might find useful

Best hearing aids available in the UK for 2026
View Best hearing aids available in the UK for 2026
Audiology Home Visits - For free in the UK
View Audiology Home Visits - For free in the UK
Hearing Tests at Home in the UK for free
View Hearing Tests at Home in the UK for free

FAQs

What is the best hearing aid model for me?

In general, any audiologist will always recommend to you the hearing aid model that best suits your needs. Here is a useful checklist to make sure that is the case.

  • Audiologist's level of knowledge: The audiologist you have seen will hopefully have a wide knowledge of all available hearing aids; however, some will only be familiar with a small number of brands and, therefore, may not really be in a position to know which model is the best for you. It is OK to challenge their recommendation and ask them to justify why this particular brand is the one for you.
  • Do research: Read about the hearing aid that was recommended. Does it seem like it will suit your lifestyle? Does it have more or fewer features than you need? 
  • Be aware of sales targets: Many high street retailers have specific tie-ins to a particular manufacturer/brand. The hearing aid they have suggested may still be the correct one for you, but do your research so that you know why they might have recommended it.  You can read our best hearing aids of this year here
Do I need one hearing aid or two?

If you have significant hearing loss in both ears, you should be wearing two hearing aids. Here are the audiological reasons why:

Localisation: The brain decodes information from both ears and compares and contrasts them. By analysing the minuscule time delays as well as the difference in the loudness of each sound reaching the ears, the person is able to accurately locate a sound source. 

Simply put, if you have better hearing on one side than the other, you can't accurately tell what direction sounds are coming from.

Less amplification is required: A phenomenon known as “binaural summation” means that the hearing aids can be set at a lower and more natural volume setting than if you wore only one hearing aid.

Head shadow effect: High frequencies, the part of your hearing that gives clarity and meaning to speech sounds, cannot bend around your head. Only low frequencies can. Therefore, if someone is talking on your unaided side, you are likely to hear that they are speaking, but be unable to tell what they have said.

Noise reduction: The brain has its own built-in noise reduction, which is only really effective when it is receiving information from both ears. If only one ear is aided, even with the best hearing aid in the world, it will be difficult for you to hear in background noise as your brain is trying to retain all of the sounds (including background noise) rather than filtering them out.

Sound quality: We are designed to hear in stereo. Only hearing from one side sounds a lot less natural to us.

Fancy some further reading on this topic?  You can read about why two hearing aids are better than one in our article, hearing aids for Both Ears, here

What are the benefits of rechargeable hearing aids?

For most people, the main benefit of a rechargeable hearing aid is simple convenience. We are used to plugging in our phones and other devices overnight for them to charge up.  Here are some other pros and cons:

For anybody with poor dexterity or issues with their fingers, having a rechargeable aid makes a huge difference, as normal hearing aid batteries are quite small and some people find them fiddly to change.

One downside is that if you forget to charge your hearing aid, then it is a problem that can't be instantly fixed. For most, a 30-minute charge will get you at least two or three hours of hearing, but if you are the type of person who is likely to forget to plug them in regularly, then you're probably better off with standard batteries.

Rechargeable aids are also a little bit bigger and are only available in Behind-the-Ear models.

Finally, just like with a mobile phone, the amount of charge you get on day one is not going to be the same as you get a few years down the line. Be sure to ask what the policy is with the manufacturer's warranty when it comes to replacing the battery.

Are Behind-the-Ear hearing aids better than In-the-Ear hearing aids?

For most people, the answer is yes. But it's never that simple.

The majority of hearing problems affect the high frequencies a lot more than the low ones. Therefore, open fitting hearing aids sound a lot more natural and ones that block your ears up can make your own voice sound like you are talking with your head in a bucket. Therefore, in-ear aids tend to be less natural.

However, the true answer is we can't tell until we have had a look in your ears to assess the size of your ear canal, and until we have tested your hearing to see which frequencies are being affected.

People with wider ear canals tend to have more flexibility, also there are open fitting modular CIC hearing aids now that do not block your ears.

There is also the age-old rule to consider, that a hearing aid will not help you if it's sat in the drawer gathering dust. If the only hearing aid you would be happy wearing is one that people can't see, then that's what you should get.

Most people can adapt to any type of hearing aid, as long as they know what to expect. Have an honest conversation with your audiologist as to what your needs are.

What are channels, and how many do I need?

Generally speaking, six or more. Unless it's none at all.  The number of channels a hearing aid has is often a simplistic way an audiologist will use to explain why one hearing aid is better than another, but channels are complex, and it is really not that straightforward.  Here are some reasons why:

Hearing aids amplify sounds of different frequencies by different amounts. Most people have lost more high frequencies than low, and therefore need more amplification in the high frequencies. The range of sounds you hear is split into frequency bands or channels, and the hearing aids are set to provide the right amount of hearing at each frequency level.

Less than six channels, and this cannot be done with much accuracy, so six is the magic number. However, a six-channel aid is typically very basic with few other features and is suitable only for hearing a single speaker in a quiet room. The number of channels is not what you should be looking at; it's more the rest of the technology that comes with them.

As a final note, different manufacturers have different approaches. One method is not necessarily better than any other. For example, some manufacturers have as many as 64 channels in their top aids. Most tend to have between 17 and 20. One manufacturer has no channels at all.

What's covered in a manufacturer's warranty?​

Manufacturer's warranties typically last between 2-5 years, depending on the brand and model, and cover defects in materials and workmanship. This includes repairs for component failures, electronic malfunctions, and manufacturing defects, but excludes damage from misuse, accidents, or normal wear. Most manufacturers also include loss and damage insurance for the first year.

We handle all warranty claims on your behalf, liaising with manufacturers and ensuring you get replacement devices quickly when needed. This comprehensive warranty coverage, combined with our lifetime aftercare, gives you complete peace of mind.  Find out more about our warranty cover here

How much does the hearing test cost?

Our hearing tests are completely free, whether at our clinics or in your home. Unlike other providers who charge £30-£100 for home visits, we believe hearing healthcare should be accessible without financial barriers. Our comprehensive assessments include examination by an HCPC-registered audiologist, audiogram results, and personalised recommendations.

All testing, future adjustments, and ongoing support are included at no extra cost. While NHS tests are also free, typical 6-week waiting periods often lead people to seek immediate private testing. We provide prompt, professional assessments that fit your schedule and budget.

Do you offer home visits, and are they included in the price?

Yes, we offer completely free home visits throughout the UK, and this service is included in our prices with no additional charges. Home visits are particularly valuable for people with mobility issues, busy schedules, or those who simply prefer the comfort and convenience of their own environment.

Our audiologists can conduct full hearing tests, fit hearing aids, and provide ongoing support in your home.  This service sets us apart from many providers who either don't offer home visits or charge extra for them.

Why are your hearing aids cheaper than what I'd pay on the high street?

We can offer prices up to 40% lower than high street retailers because of our business model. As a network of 200+ independent audiologists, we don't have the massive overheads of large retail chains - no expensive high street premises, no sales targets pushing audiologists to sell the most expensive options, and no costly marketing campaigns.

However, we maintain the same buying power as the big chains because we purchase on behalf of our entire nationwide network. This means you get access to the same premium hearing aids with professional service, but at genuinely competitive prices.

How long do I have to try the hearing aids before committing to keep them?

We offer a comprehensive 60-day money-back guarantee, which gives you twice the industry standard time to properly assess whether your hearing aids are right for you. This extended period recognises that adjusting to hearing aids takes time, and your brain needs several weeks to adapt to the amplified sounds.

Unlike many providers who offer just 30 days, we believe 60 days gives you the confidence to test your hearing aids in all the situations that matter to you - from quiet conversations at home to busy restaurants and outdoor activities.

Need advice? Give our hearing aid experts a call for FREE

Ask the Experts

Please correct any validation errors.

Get free independent impartial advice from the experts you can trust. We offer nationwide coverage and huge savings on all our hearing aids.

Hearing Aid UK Ltd.
6 Morton Lane
Walkwood
Redditch
Worcestershire
B97 5QA
Download Free Guide calendar logo Book a Free Appointment

Thank you, we have added you to our newsletter list.

© Hearing Aid UK Ltd. 2026

Latest Launch

When we refer to a product as 'Latest Launch', we mean it is the latest to be released on the market.

Close

New

When we refer to a product as 'New', we mean that the product is the newest hearing aid model on the market.

Close
Superseded

When we refer to a product as 'Superseded', we mean that there is a newer range available which replaces and improves on this product.

Close

Older Model

When we refer to a product as an 'Older Model', we mean that it is has been superseded by at least two more recent hearing aid ranges.

Close