SONNET 2 EAS Audio Processor

Don’t fit your life around an audio processor—choose a processor that fits your life! SONNET 2 EAS is the audio processor made for you. Choose how you’d like it to look. Choose how you’d like to connect to your phone and other devices. And choose to experience your best hearing, wherever you are.

SONNET 2 - Smart Sound Technology

Easy Listening

SONNET 2 EAS is built to give you your best hearing possible. Using a combination of both cochlear implant and hearing aid technology, SONNET 2 EAS makes the most of your unique natural hearing, so you can hear things as they were meant to sound. What’s more, with ASM 3.0 technology and FineHearing sound coding, SONNET 2 EAS makes sure you hear your best wherever you are.


Adaptive Intelligence

SONNET 2 EAS 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 EAS minimizes unnecessary noise, and 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.

SONNET 2 EAS - Connect to Your Devices
SONNET 2 EAS - AudioLink

Connect to Your Devices

Experience great sound quality from the devices you already own and love. SONNET 2 EAS is fully compatible with AudioLink—a universal connectivity device that allows you to stream sound from phones, tablets, TVs, and much more. As long as your device has either Bluetooth or a headphone jack, you can connect it to AudioLink and send the sound straight to your ears.


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SONNET 2 and AudioKey


Change Settings On The Go

Why carry around a remote control and a phone, when you could just control your audio processor from your phone? The AudioKey app lets you change volume, sensitivity and other settings at the push of a button. Not only that, but it also lets you see your personal hearing stats for each day of hearing.

And if you lose your SONNET 2 EAS? Then the "Find My Processor" function can show you where you last used the app with your audio processor, so you can retrace your steps.


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SONNET 2 - Style
SONNET 2 - Style

Complete Your Look

Choose the colours that suit you. SONNET 2 EAS offers thousands of colour combinations, so you can easily personalize it to match your style. And if you really want to show off your audio processor, there are plenty of funky Design Covers that do just that!

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


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SONNET 2 - water-resistant

Make A Splash

Whether relaxing on the beach, or diving into the pool—enjoy great hearing in the water with WaterWear. These reusable covers make SONNET 2 EAS completely waterproof, so you can enjoy all the sounds of the sea without the hassle.

And for everyday, SONNET 2 EAS’s superior water-resistant design protects it from rain, splashes, and sweat. That means you can go for a run in the rain and not think twice about your audio processor!


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SONNET 2 - For Kids
SONNET 2 EAS - For Kids

For Kids

Compact, durable, and with a range of in-built safety features—SONNET 2 EAS is the ideal choice for your child. Find out how SONNET 2 EAS can help your child to hear their best.

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 Cochlear Implant black

SYNCHRONY 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 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)
  • 11.0 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
  • Supports Electric-Acoustic Stimulation (EAS)


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 meters 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