SONNET 2 Audio Processor

Don’t fit your life around an audio processor—choose a processor that fits your life! Whatever your lifestyle, SONNET 2 is made for you. Wear it the way you want to. Connect it to the phone you already have. And experience great sound quality, whatever you’re doing.

SONNET 2 - Smart Sound Technology

Easy Listening

SONNET 2 is designed to give you your best hearing possible, wherever you are. Whether in a noisy restaurant, at a music concert, or simply taking a walk on a windy day, SONNET 2 lets you hear your best in any environment.


Adaptive Intelligence

SONNET 2 recognizes what kind of environment you’re in, and automatically adjusts settings to match. Best of all, you won’t even realize it’s happening.

Noise Reduction

From background noise in a café, to an unexpected dog bark, SONNET 2 minimizes unnecessary noise, so you can have the confidence to chat in any environment.


Hear the details with FineHearing sound coding technology. FineHearing lets you hear the world as it was meant to sound—from your favorite song to the voice of a loved one.


Hear the Difference

Any audio processor can give you sound. We want to give you more—that’s why our audio processors are powered by Triformance technology.

With a more natural sound quality that no other cochlear implant system can match, you can enjoy richer music and more natural speech. You’re choosing to hear, so why not choose to hear your best?

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SONNET 2 and AudioLink

Connect to Your Devices

Use the phone you like, and connect it to the audio processor you love. Just slide the AudioStream cover onto your SONNET 2 to stream music and phone calls directly to your audio processor. Or use AudioLink—a universal connectivity device that allows you to stream sound from phones, tablets, TVs, and much more. AudioLink can connect to anything that has Bluetooth® or a headphone jack, including that old record player in the attic!


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SONNET 2. Made For You.

Want to know how SONNET 2 fits your lifestyle?
Take our 5 minute quiz and find out!


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SONNET 2 and AudioKey

AudioKey 2

Be In Control

Gone are the days of carrying around a remote control. With the new AudioKey 2 app, you can change settings on your SONNET 2 directly from your phone. Volume, mic sensitivity, program selection—all at the press of a button.

What’s more, AudioKey 2 also lets you see your individual hearing stats, such as how long you wear your SONNET 2 each day. And if you unexpectedly lose your processor, the "Find My Processor" function shows where you last used the app with your audio processor, so you can retrace your steps.


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AudioKey is available in areas where AudioKey 2 is not. Please contact your local MED-EL representative for more information.

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SONNET 2 - Style
SONNET 2 - Style

Match Your Style

Style your SONNET 2 to match your individual look. With thousands of color combinations to choose from, you really can give your SONNET 2 a unique makeover!

Visit the SONNET Series Colour Configurator, and start designing your personal SONNET 2.


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Design Award 2019

Awarded to the SYNCHRONY System, comprising the SONNET 2 Audio Processor and accessories, SYNCHRONY 2 Cochlear Implant, and MAESTRO 8.0 fitting software.

SONNET 2 - water-resistant
SONNET 2 WaterWear

Splash Around

With SONNET 2, you can get caught in the rain! SONNET 2’s water-resistant design protects it from everyday splashes and moisture. Going for a run in the rain just got a little bit easier.

And for swimming or other water sports, the waterproof WaterWear covers are ideal! Simply slip the cover over your processor and enjoy hours of hearing fun in the pool or at the beach.


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SONNET 2 - For Kids
SONNET 2 - for kids

For Kids

Choosing the right audio processor for your child can be hard. SONNET 2’s compact and durable design makes it the ideal choice for children—from tiny babies right through to big kids.

SONNET 2 - Long-Lasting Power
SONNET 2 - Long-Lasting Power

Long-Lasting Power

SONNET 2’s powerful batteries mean you can go for days at a time. Choose regular zinc-air disposable batteries for the longest wearing time. Alternatively, the rechargeable batteries are a convenient way to keep SONNET 2 powered up throughout the day.


SYNCHRONY 2 Cochlear Implant

A good audio processor is only half the story. Great hearing depends on having a great cochlear implant.

With its unique Triformance technology, reliable design, plus the highest MRI safety available, SYNCHRONY 2 is the ideal implant for you.   

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Technical Data


Width: 37.4mm
Height: 56.7mm with Battery Pack Cover Standard
Height: 51.4mm with Battery Pack Cover Micro
SONNET Audio Processor Size
Thickness: 5.9mm
Thickness: 9.3mm

Audio Processor

Weight and Dimensions

  • 6.1 g (with ActiveWear)
  • 8.1 g (with Rechargeable Battery Micro)
  • 10.6 g (with two 675 zinc-air batteries)
  • DL-Coil: 4.6 g, 32.8 mm x 5.8 mm
  • DL-Coil: 5 magnets available in 9 strengths
  • Durable coil cables available in 3 lengths:
    • 6.5 cm (2.6 in)
    • 9 cm (3.5 in)
    • 28 cm (11.0 in)


  • Processor & Coil: Mixture of polycarbonate and acrylonitrile-butadiene-styrol polymer
  • Earhook: Polyamide (PA)
  • Cable: PVC and TPE Evoprene


  • Backwards compatible with all MED-EL multichannel cochlear implants.
  • MAX Programming Interface
  • MAESTRO System Software 8.0 and later


Product Features

  • Frequency Range 70–9300 Hz
  • Splashproof design with IP54 rating
  • Dual microphones
  • Extended Datalogging
  • Automatic Sound Management 3.0
  • Tamperproof design
    • Secured earhook
    • Locking battery pack
    • Choking hazard avoidance
    • Attachment security measures
    • Locking coil cable (locked to coil and control unit)
  • Link-check coil function with LED indicator
  • Four program positions
  • Continuous volume and sensitivity control with FineTuner Echo or AudioKey


Sound Processing Features

Front-End Processing

  • Microphone Directionality (Omni, Natural, Adaptive)
  • Automatic Volume Control with Dual-Loop AGC
  • Wind Noise Reduction
  • Ambient Noise Reduction
  • Transient Noise Reduction
  • Input Dynamic Range (IDR) of 78 dB (28–106 dB SPL)


Coding Strategies

  • FS4 (Fine Structure Processing up to 1 kHz on 4 apical channels)
  • FS4-p (Fine Structure Processing up to 1 kHz on 4 apical channels with Intelligent parallel Stimulation for even higher temporal accuracy)
  • FSP (Fine Structure Processing typically up to 350 Hz on 2 apical channels)
  • HD-CIS (High Definition CIS)
  • Biphasic or Triphasic stimulation pulses
  • Supports 250 spectral bands



FineTuner Echo

  • Dimension: 104 x 38 x 11 mm
  • Weight: 32g (incl. Battery)
  • Remote control with bi-directional communication
  • Display
  • Troubleshooting
  • Battery status


WaterWear for BTE

  • Waterproof cover
  • Waterproof up to 4 metres depth
  • Rated IP68
  • Can be used in salt, fresh, and chlorinated water



Processor Features

  • Integrated 2.4 GHz module for wireless communication
  • Direct streaming for iOS and Android
  • Integrated telecoil
  • FM functionality via FM battery pack cover or RogerTM 21 from Phonak

AudioKey App

  • Remote control
  • Guardian functionality
  • Datalogging
  • Input selection



  • Dimensions: 68 x 38 x 17.5 mm
  • Weight: 35 g
  • 2.4 GHz wireless device
  • Remote microphone
  • Hands-free phone calls
  • TV streaming
  • Music streaming
  • Direct audio input (DAI)


Battery Options

Zinc-Air Batteries

  • Up to 60 hours of use with a set of 2 disposable zinc-air 675 batteries

SONNET Rechargeable Battery

  • Dimension: 22 x 14 x 7 mm
  • Processor Weight with Battery: 9.1 g
  • Usage time: Up to 10 hours
  • Charging duration: ~4 hours
  • Lifetime: >500 charging/discharging cycles

SONNET Rechargeable Battery Micro

  • Dimension: 16 x 14 x 7 mm
  • Processor Weight with Battery: 8.1 g
  • Usage time: Up to 7 hours
  • Charging duration: ~3 hours
  • Lifetime: >500 charging/discharging cycles

SONNET Charging Unit

  • 4 simultaneous charging slots
  • Power & charging indicator lights
  • USB powered: 5V DC, 500mA
  • USB power adapter: 100–240V AC (~50/60 Hz)

SONNET 2 Mini Battery Pack

  • Dimensions: 66 x 29 x 14 mm
  • Weight (without battery): <13g
  • Usage time:
    Up to 37 hours with 1 AAA battery or
    up to 16 hours with Rechargeable DaCapo Powerpack