Head of Online Medical Content
Audiology Expert at Hearing Aid UK

Overview | What they share | The Infinio Ultra | The Infinio Ultra Sphere | A comparison | Conclusion
Phonak has streamlined its premium hearing aid lineup, and the current range centres on two variants: the Infinio Ultra and the Infinio Ultra Sphere. Both represent Phonak's latest technology - the previous standard Infinio and Infinio Sphere lines have been discontinued.
So you're choosing between two genuinely advanced options rather than deciding whether to upgrade or not. The question is: do you need the Sphere's additional firepower, or will the standard Ultra handle everything you throw at it?
Plus, what has stayed the same and what has improved since the original superseded Infinio? Let's find out...

This is evolutionary refinement in a nutshell. The hardware foundation (ERA chip) stayed the same, but the software (AutoSense OS 7.0), connectivity, and maintenance were meaningfully improved. Think of it as the same car with a much better engine management system, upgraded infotainment, and easier servicing.
This is revolutionary hardware, and the addition of the dedicated DEEPSONIC AI chip is genuinely new technology that didn't exist before. This isn't just better software running on the same hardware - it's additional processing power specifically for speech-in-noise challenges.
| Old Infinio Original Platform | Infinio Ultra R Software + Connectivity Upgrade | Infinio Ultra Sphere New AI Chip Technology |
|---|---|---|
| Core Hardware | ||
| ERA processing chip | ERA chip (Same foundation) | ERA chip + DEDICATED DEEPSONIC AI CHIP Additional hardware specifically for speech-in-noise |
| Standard rechargeable | Rechargeable Up to 31 hours battery | Rechargeable Up to 56 hours battery (in optimal conditions) |
| Intelligence & Software | ||
| AutoSense OS 6.0 | AutoSense OS 7.0
| AutoSense OS 7.0
|
| Standard speech clarity | Spheric Speech Clarity (Existing technology refined) | Spheric Speech Clarity 2.0
|
| Connectivity & Pairing | ||
| Bluetooth connectivity Standard pairing process | Enhanced Bluetooth
| Enhanced Bluetooth
|
| Maintenance & Usability | ||
| Standard wax filters Regular filter changes needed | EasyGuard Domes
| EasyGuard Domes
|
Ultra R Analogy: Same car, but with: upgraded engine management system, better infotainment, easier servicing, more reliable technology. Drives better, connects better, needs less maintenance. Ultra Sphere Analogy: Same car body + all the Ultra R upgrades, PLUS a dedicated co-pilot AI that specifically handles navigation through difficult terrain. It's genuinely new hardware, not just better software. | ||
What changed: Software intelligence, connectivity reliability, maintenance ease
What stayed: Core hardware (ERA chip), physical design, fundamental processing
Best for: Users wanting modern refinements without paying for revolutionary AI hardware
What changed: Added dedicated DEEPSONIC AI chip + all Ultra R improvements
Game changer: True multi-directional speech processing that didn't exist before
Best for: Users who struggle in complex noise with multiple sound sources
Both hearing aids are built on the same impressive platform, which means you're getting premium technology regardless of which you choose.
They both use AutoSense OS 7.0 - Phonak's latest environment detection system that's been trained on 18 times more sound environments than previous versions. This translates to roughly 24% more precise adaptation to different listening situations compared to older Phonak models.
You'll get excellent Bluetooth connectivity with both variants (up to eight devices paired, two active simultaneously, with simplified one-step pairing that actually works), rechargeable batteries with impressive longevity, and those clever EasyGuard domes that reduce how often you're fiddling with wax-filter changes.
The myPhonak app works seamlessly with both, giving you control over settings and adjustments when you need them.
Honestly, you're starting from an excellent baseline with either option - this isn't a case of "basic vs premium" but rather "premium vs ultra-premium for specific situations.

The standard Ultra variant represents Phonak's premium technology for the majority of listening situations. It uses the ERA processing chip to deliver what Phonak calls Spheric Speech Clarity - essentially sophisticated algorithms that help you understand speech even when there's competing noise around you.
The AutoSense OS 7.0 system works constantly in the background, recognising your environment and adjusting accordingly. Moving from a quiet room to a busy cafe? No problem, the Ultra adapts automatically.
Taking a phone call? No problem, it switches seamlessly to optimal streaming mode. It's genuinely set-and-forget technology that handles the vast majority of daily listening challenges without you needing to think about it.
Battery life is strong - you'll get a full day's use comfortably, and the rechargeable system means you simply pop them on the charger overnight.
The Bluetooth connectivity is reliable enough that you'll actually want to use it for music, podcasts, and phone calls rather than seeing it as a feature that sounds good but doesn't quite work properly.
The Ultra also handles noise well. It separates speech from background sound effectively in most situations, and for many people, it's more than capable of managing their daily listening needs, whether that's conversations at home, meetings at work, or social outings in moderately noisy environments.

Here's where things get interesting. The Ultra Sphere takes everything from the standard Ultra and adds dedicated hardware specifically designed for the most challenging listening situations.
The key difference is an additional DEEPSONIC chip that focuses purely on separating speech from noise coming from any direction. This isn't just a software upgrade - it's actual additional processing power dedicated to one specific task:
Helping you understand conversations when noise is coming at you from multiple directions simultaneously.
In practical terms, this means the Sphere excels in situations where the standard Ultra might start to struggle:
Think busy restaurants with hard surfaces where conversation bounces everywhere, crowded networking events with dozens of people talking at once, open-plan offices where there's no escape from multiple sound sources, or outdoor spaces where wind and traffic compete with the person you're trying to hear.
Rather impressively, despite having additional processing power running constantly, the Sphere variant actually achieves better battery life in certain conditions - up to 56 hours in optimal situations.
Obviously, real-world use varies depending on streaming, environment, and settings, but it's genuinely impressive that adding more processing power hasn't compromised battery performance.
The Sphere shares all the connectivity improvements of the standard Ultra: simplified Bluetooth pairing, support for multiple devices, reliable streaming, and hands-free calling that works properly.
You're not sacrificing anything in terms of connectivity or convenience by choosing Sphere - you're purely adding speech-in-noise capability.
| Feature | Infinio Ultra | Infinio Ultra Sphere - PREMIUM |
|---|---|---|
| Operating System | AutoSense OS 7.0 | AutoSense OS 7.0 |
| Processing Chip | ERA chip | ERA chip + dedicated DEEPSONIC chip |
| Speech in Noise | Spheric Speech Clarity | Enhanced Spheric Speech Clarity with dedicated multi-directional processing |
| Noise Direction Handling | Excellent from primary directions | Superior from all directions simultaneously |
| Best For | Most everyday listening situations | Extreme noise with multiple sound sources |
| Battery Life | Full day use | Up to 56 hours (in optimal conditions) |
| Bluetooth Pairing | One-step simplified pairing 8 devices, 2 active | One-step simplified pairing 8 devices, 2 active |
| Maintenance | EasyGuard domes (reduced filter changes) | EasyGuard domes (reduced filter changes) |
| Streaming Quality | Direct to both ears, hands-free calls | Direct to both ears, hands-free calls |
| Environment Adaptation | 24% more precise than previous generation | 24% more precise than previous generation |
| myPhonak App | Full compatibility and control | Full compatibility and control |
Here's something worth considering: the Sphere's additional capability really does make a difference in extreme noise, but "extreme noise" isn't where most people spend most of their time.
If you're someone who occasionally goes to a busy restaurant but spends most days in more controlled environments, the standard Ultra will likely serve you brilliantly 95% of the time.
However, if those challenging situations are regular occurrences - if they're part of your work life, your social life, or your family life - then the Sphere's additional processing power could genuinely reduce listening fatigue and improve your quality of life in those moments.
It's about matching the technology to your actual lifestyle rather than simply buying the most expensive option.
Both the Infinio Ultra and Ultra Sphere represent Phonak's current best technology - these aren't old models we're trying to clear out or entry-level options dressed up as premium. You're choosing between excellent and exceptional, and which is right depends entirely on your specific circumstances.
The Sphere genuinely does offer measurable improvements in extreme noise situations with multi-directional sound sources. Whether those improvements matter to you depends on how often you encounter those situations and how much they impact your quality of life.
For some people, the Sphere is genuinely life-changing. For others, the standard Ultra delivers everything they need and more.
The best approach is to have a proper conversation with a qualified audiologist about your specific hearing loss, your lifestyle, and the listening situations you find most challenging.
At Hearing Aid UK, that's exactly what we do - and we do it without pressure, with genuinely independent advice, and with the confidence that comes from our lifetime aftercare commitment.
If you'd like to discuss whether the Phonak Infinio Ultra or Ultra Sphere would be right for you, we're here to help. Our audiologists can visit you at home anywhere in the UK, assess your hearing, understand your lifestyle, and help you make an informed decision based on your actual needs rather than marketing claims.
After all, choosing hearing aids should be about finding the right technology for your life, not simply buying the most expensive option because it exists.
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.
This is where our nationwide network of over 200 qualified audiologists makes a real difference. 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.
And because we offer free home visits throughout the UK, this happens in your own environment rather than in a clinical setting that doesn't reflect your real life.
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Not only are the prices great, but the service is fantastic! Many thanks to your team.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.
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
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.
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.
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.
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.
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 a 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.
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.
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.
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.
When we refer to a product as 'Latest Launch', we mean it is the latest to be released on the market.
When we refer to a product as 'New', we mean that the product is the newest hearing aid model on the market.
When we refer to a product as 'Superseded', we mean that there is a newer range available which replaces and improves on this product.
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.