Phonak Slim: Dr. Cliff's Audiologist's Review

The Phonak Slim, with its unique design and cutting-edge technology, has certainly piqued my interest. Phonak was originally going to release a similar product years ago on it’s previous Paradise line, but ultimately scrapped the product…until now.

Slim Design and Aesthetics

One of the most unique aspects of the Phonak Slim is its innovative design. Unlike traditional hearing aids, which often have a one-size-fits-all approach, the Slim is designed to contour to the head with a 7-degree bend. This provides a snug and comfortable fit, leaving more room behind your ears. This is a significant advantage for individuals who wear glasses or use oxygen, as it reduces the discomfort that can sometimes occur when wearing multiple devices behind the ear.

In addition to its ergonomic design, the Phonak Slim also stands out for its aesthetic appeal. It comes in four two-tone colors: Graphite/Black, Copper/Black, Sandalwood/Black, and Silver/Black. This range of options allows users to choose a color that matches their personal style, making the hearing aid not just a medical device, but also a fashion accessory. I like the way the Phonak Slims look, but I do prefer the look of the Signia Styletto hearing aids over these.

Phonak Slim Hearing Aids

Interestingly, when we measured these devices, they were only 0.55 mm slimmer than the regular Audeo Lumity hearing aids. Watch my video on why I think these should be called the Phonak Longs.

Phonak Slim Technology

But the Phonak Slim is not just about looks. It's a high-performance hearing aid that runs on the same technology as Phonak's flagship product, the Audeo Lumity. The Lumity is known for its superior background noise management, a feature that is incredibly important for hearing aid users who often find themselves in noisy environments.

The Slim features an automatic operating system, AutoSense OS 5.0, which uses machine learning to scan the environment 700 times per second for real-time adjustments. This means the hearing aid can quickly shift modes when your environment gets louder, providing you with a seamless listening experience. This is a significant advancement in hearing aid technology, as it allows the device to adapt to changing environments in real-time, ensuring optimal performance at all times.

The Slim includes SmartSpeech technology, which comprises special features focused on background noise management, such as StereoZoom 2.0 and SpeechSensor, in addition to its advanced operating system. These features enhance the sound of the person in front of you over the background noise, leading to a better understanding of speech. This is particularly useful in social situations where multiple conversations are happening at once, as it allows the user to focus on the person they are speaking to without being distracted by background noise. I believe that right now in 2023, Phonak’s current products have some of the very best noise reduction capabilities in the industry.

Connectivity and App Support

The Phonak Slim is designed for the modern user, with a range of connectivity features that make it a versatile and user-friendly device. It includes tap-control, hands-free calling on Android and iPhone devices, and a more stable Bluetooth classic connection. These features allow users to easily control their hearing aid settings, answer phone calls, and connect to various devices for a seamless audio experience. These devices, similar to the Audeo Lumity hearing aids, allow you to pair up to eight devices and enable your hearing care professional to customize the streaming sounds separately from other sounds.

The Slim pairs with the myPhonak app, which allows users to personalize their hearing experience and track their health data. The app provides remote control functionality, giving users the power to adjust their hearing aid settings to suit their needs. This level of control and customization is a significant advantage, as it allows users to tailor their hearing aid experience to their specific needs and preferences.

Slim Technology Levels

Unfortunately, the Phonak Slim hearing aids are only available in the 90 and 70 technology levels. While these levels provide a lot of the advanced customization features, it does leave out the more affordable 50 and 30 technology levels. I always recommend going with the highest technology level that you can reasonable afford, so having fewer options may eliminate the Slim for some patients.

The Impact on Patients

In my professional opinion, the Phonak Slim is a game-changer in the world of hearing aids. It combines a sleek, modern design with advanced hearing technology, providing a solution that not only enhances hearing but also boosts the wearer's confidence. The unique design, advanced features, and user-friendly connectivity options make it a versatile device that can adapt to a wide range of hearing needs and lifestyles.

As an Audiologist, my primary concern is how a hearing aid can improve the lives of my patients. The Phonak Slim, with its combination of style and performance, has the potential to significantly enhance the user experience. The sleek design can boost the confidence of wearers, making them more comfortable wearing their hearing aids in public. This can lead to more consistent use, which is crucial for optimal hearing aid performance.

The advanced technology in the Phonak Slim also promises to improve the quality of life for users. The superior background noise management can make social situations more enjoyable, reducing the stress and fatigue often associated with trying to follow conversations in noisy environments. The seamless connectivity options also make the Slim a convenient device for the modern user, integrating easily with other devices for a smooth and hassle-free audio experience.

Looking Forward

I'm excited to see how the Phonak Slim will impact the lives of my patients. The combination of style and performance makes it a promising device that could potentially transform the way we think about hearing aids. However, it's important to remember that the best hearing aid is the one that meets your unique hearing needs. The Phonak Slim is certainly worth considering, but it's always best to consult with your Audiologist to determine the best solution for you. It’s also important to remember that it does not matter how awesome any hearing aid is unless you’ve had it fit and programmed by a hearing care professional that follows Best Practices.

As I continue to explore the features of the Phonak Slim, I look forward to sharing more insights and updates. The world of hearing technology is constantly evolving, and it's an exciting time to be part of this journey. Stay tuned for more reviews and insights as we continue to explore the latest advancements in hearing technology.

Related reading: Review of Phonak Audeo Lumity

Dr. Cliff's Pros and Cons for


  • Lumity platform
  • Wireless connectivity
  • Rechargeable
  • Stylish design
  • Great custom earmold options
  • Great Noise Reduction
  • Fully customizable streaming programming


  • Not slimmer than other models
  • Non-discrete
  • Hands-free voice pickup (mic) not good
Cliff Olson

Cliff Olson is an Audiologist and the co-founder of HearingUp and Applied Hearing Solutions in Phoenix, AZ. In addition, he runs and creates content for the popular DrCliffAuD YouTube channel.


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