SONNET 2 Audio Processor

Made for the most natural hearing in any listening environment
SONNET 2 is our latest BTE audio processor for MED-EL cochlear implants. From Adaptive Intelligence to wireless connectivity, SONNET 2 is packed with tons of new technology that’s made for the best hearing experience possible.
- Outstanding Hearing Performance
- Sleek Design
- Wireless Connectivity

Made for Everywhere
SONNET 2 is made for exceptional hearing performance, even in challenging listening environments. Automatic Sound Management 3.0 seamlessly adapts for optimal hearing and hands-free control. From busy offices to noisy restaurants, ASM 3.0 enables clearer, more comfortable hearing experience.
Microphone Directionality
Reduces noise from behind and focuses on sounds to the front for significantly better hearing in noise.
Automatic Volume Control
Dual-Loop Automatic Gain Control instantly adapts volume levels to make loud sounds more comfortable and soft sounds easier to hear.
Ambient Noise Reduction
Reduces continuous ambient noise—such as a desk fan—for easier, clearer listening.
Adaptive Intelligence
Intelligently adapts front-end processing to changing listening environments for the best hearing in any environment.
Wind Noise Reduction
Minimises continuous wind noise for improved listening in outdoor environments.
Transient Noise Reduction
Instantly attenuates sudden loud noises for comfortable listening in any setting.
FineHearing Sound Coding
In nature, the cochlea uses two types of sound coding. Place-pitch tonotopic coding is used along the whole frequency range. In addition to place-pitch coding, low-frequency sounds are also coded by rate. With this time-coding, the frequency of nerve signals is synchronized to the frequency of the sound below ~1000 Hz.
That’s why we created the only cochlear implant sound coding that mimics the natural time-coding for low frequencies and provides place-pitch match throughout the cochlea. By mimicking natural sound coding, FineHearing provides much more natural
sound quality.

Processor Design
SONNET 2 is a sleek, lightweight BTE processor with a modular design, allowing you to adapt it to best fit the needs of each individual. With built-in water resistance, flexible wearing options, rechargeable batteries, thousands of color configurations, and a durable design, it’s made for all-day comfort and performance in everyday life.


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


Made for Connectivity
SONNET 2 makes it easy to stream phone calls or connect to music, movies, and television. With integrated 2.4 GHz wireless connectivity, SONNET 2 lets your patients connect to almost any audio source. Our all-in-one AudioLink accessory makes it easy to stay connected, and the direct streaming of music and phone calls from any compatible smartphone or tablet is simple with AudioStream.*

AudioLink
With AudioLink, you can stream phone calls right to SONNET 2. You can also connect to music or stream high-quality sound from TVs or tablets. AudioLink also has a built-in microphone, so you can use it as a remote microphone. This offers an easy-to-use listening boost in busy meetings and restaurants or for clearer listening in a classroom.
- Bluetooth® Streaming
- Remote Microphone
- Direct Audio Input

AudioStream
SONNET 2 users from as far back as 2014—farther back than any other cochlear implant manufacturer in the world—can enjoy direct wireless streaming. After sliding the AudioStream cover onto their audio processor, they can stream phone calls and music from any compatible smartphone or tablet.*
- Streaming via Bluetooth® Low Energy
- High-quality sound
- True stereo support for bilateral recipients
- Bimodal streaming from compatible smartphones**

AudioKey 2
Control and personalize SONNET 2’s user settings, check on a user’s hearing, view detailed data on wearing time, program, and connectivity usage as well as locate SONNET 2 when you want to find it—all with the AudioKey 2 app. The guardian roles let you create multiple users’ profiles for flexibility and security as you manage multiple users and processors.
- Remote Control
- Extended data logging for SONNET 2
- Required for initial setup of AudioStream

FineTuner Echo
The FineTuner Echo remote is a compact, easy-to-use remote with a built-in display. This bi-directional remote shows current settings, including program, volume, connectivity. E-paper display makes it easy to read, even in bright sunlight.
- Bilateral Support
- Integrated Speech Processor Test Device
- E-Paper Display

Why MED-EL:
A Trusted Partner
For more than 30 years, MED-EL has been a trusted partner and innovation leader in hearing implants. We’re here to work together with you, and we’re committed to providing outstanding service and support for our professional partners.
With the most advanced cochlear implant systems, we offer the best hearing experience for your patients and the best clinical experience for you.
Contact Us
Ready to learn more about MED-EL cochlear implants?
Fill out our simple contact form and we’ll get in touch with you.


SYNCHRONY 2
See why individualized electrode arrays, safe access to MRI, and a streamlined central electrode lead for exceptional surgical handling make SYNCHRONY 2 your new favorite cochlear implant.
Discover More

Electrodes
Find out what sets MED-EL electrode arrays apart from any other design to enable a closer to natural sound quality that no other cochlear implant can match.

RONDO 3
Find out how wireless charging, directional microphones, and wireless connectivity make RONDO 3 incredibly simple and simply incredible.

MAESTRO 9.0
By combining an intuitive interface with powerful fitting tools, MAESTRO 9.0 system software is faster, easier, and more powerful than ever before.
Technical Data


SONNET 2 Audio Processor
(Me1510)
Dimensions and Weight
- 6.1 g (with ActiveWear)
- 10.6 g (Me1510 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)
Material
- Processor & Coil: Mixture of polycarbonate and
acrylonitrile-butadiene-styrol polymer - Earhook: Polyamide (PA)
- Cable: PVC and TPE Evoprene
- Biocompatible according to ISO 10993-1
- Latex-free***
Compatibility
- Compatible with all MED-EL multichannel cochlear implants
- MAX Programming Interface
- MAESTRO System Software 8.0 or later
- Compatible with hearing aids of all brands and types
- Exact bimodal synchronization with any hearing aid: Signal can be delayed up to 10 ms with the latest MAESTRO Software
Product Features
- Frequency Range 70–9300 Hz
- Water-resistant according to IP54 standard
- Dual microphones
- Extended Datalogging
- Automatic Sound Management 3.0
- Tamperproof design
- Secured earhook
- Locking battery pack
- Choking hazard avoidance
- Additional fixation options
- Locking coil cable (locked to coil and control unit)
- Link-check function with LED indicator
- Four program positions
- Continuous volume and sensitivity control with FineTuner Echo or AudioKey 2
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)
Sound 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
Connectivity
Technology
- 2.4 GHz wireless communication
- Direct wireless audio streaming via Bluetooth Low Energy with AudioStream
- True stereo sound quality
- Support for bilateral usage
- Integrated telecoil
- Bimodal streaming possible with several brands of hearing aids
Accessories
AudioLink
- Dimensions: 68 x 38 x 17.5 mm
- Weight: 35 g
- Remote microphone
- Hands-free phone calls
- TV streaming
- Music streaming
- Direct audio input (DAI)
AudioKey 2 App
- Remote control functionality
- Guardian Roles
- Extended Datalogging
- Find My Processor
- Send Feedback
FineTuner Echo
- Dimensions: 104 x 38 x 11 mm
- Weight: 32 g (including battery)
- Compact remote control with bi-directional communication
- ePaper Display
- Test audio processor microphones
- SONNET 2 battery status
WaterWear Cover
- Waterproof up to 4 m depth
- Can be used in salt, fresh and chlorinated water
Battery Options
Zinc-Air Batteries
- Up to 60 hours of use with a set of 2 disposable zinc-air 675 batteries
Rechargeable Battery Max
- Dimension: 32 x 14 x 7 mm
- Processor weight with battery: 10.4 g
- Usage time: Up to 17 hours
- Charging duration: ~6 hours
- Charging/discharging: >1800 cycles (80% capacity)***
Rechargeable Battery Standard
- Dimension: 22 x 14 x 7 mm
- Processor weight with battery: 9.1 g
- Usage time: Up to 10 hours
- Charging duration: ~4 hours
- Charging/discharging: >5000 cycles (80% capacity)****
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
- Charging/discharging: >5000 cycles (80% capacity)****
Charging Unit
- 4 simultaneous charging slots
- Power & charging indicator lights
- USB powered: 5V DC, 500mA
- USB power adapter: 100–240V AC (~50/60 Hz)
Please find detailed information and specific conditions for use for each product in the respective instructions for use.
All functions and features may not be available in all markets. Enabling features on the hardware may be subject to technical considerations.
Direct Wireless Streaming Cover for SONNET Series Audio Processors
AudioStream can be used as a Made for iPhone (MFi) Hearing Device and supports the Audio Streaming for Hearing Aids (ASHA) technology. MED-EL recommends keeping your device(s) updated with the latest version of the iOS or Android operating system. AudioStream is compatible with iOS version 11 or later and Android version 10 or later.
* AudioStream for SONNET series audio processors is compatible with Apple and Android devices. For a detailed list of compatible devices, see below.
** Bimodal streaming is only possible with Android 12 or later and hearing aids compatible with Audio Streaming for Hearing Aids (ASHA) technology. For a detailed list of compatible devices, see below.
*** Whereby “free” means “not made with latex” according to current FDA guidance: “Recommendations for Labeling Medical Products to Inform Users that the Product or Product Container is not Made with Natural
Rubber Latex", 2014.
**** Charging Cycles dependent on individual usage.
Devices Compatible With AudioStream
iOS
iPhone 14, iPhone 13 Pro Max, iPhone 13 Pro, iPhone 13, iPhone 13 Mini, iPhone SE 3rd Gen, iPhone 12 Pro Max, iPhone 12 Pro, iPhone 12, iPhone 12 Mini, iPhone 11 Pro Max, iPhone 11 Pro, iPhone 11, iPhone SE 2rd Gen, iPhone XS Max, iPhone XS, iPhone XR, iPhone X, iPhone 8 Plus, iPhone 8, iPhone 7 Plus, iPhone 7, iPhone 6s Plus, iPhone 6s, iPhone 6 Plus, iPhone 6, iPhone SE, iPhone 5s, iPhone 5c, iPhone 5
iPad Pro (12.9 inch) 2nd Generation, iPad Pro (12.9 inch) 1st Generation, iPad Pro (10.5 inch), iPad Pro (9.7 inch), iPad Air 2, iPad Air, iPad mini 4, iPad mini 3, iPad mini 2, iPad 9th Generation, iPad 6th Generation, iPad 5th Generation, iPad 4th Generation, iPod touch 6th Generation
Google Pixel 7, Google Pixel 6 Pro, Google Pixel 6, Google Pixel 5, Google Pixel 5a (5G), Google Pixel 4 XL, Google Pixel 4, Google Pixel 4a, Google Pixel 4a (5G), Google Pixel 3 XL, Google Pixel 3, Google Pixel 3a XL, Google Pixel 3a
Samsung Galaxy S23, Samsung Galaxy S22, Samsung Galaxy S21+, Samsung Galaxy S21, Samsung Galaxy S20 Ultra, Samsung Galaxy S10+, Samsung Galaxy S10, Samsung Galaxy S10e, Samsung Galaxy S9+, Samsung Galaxy S9, Samsung Galaxy Z Fold2 5G, Samsung Galaxy A71, Samsung Galaxy A70, Samsung Galaxy A52, Samsung Galaxy A51, Samsung Galaxy Tab S7+
OnePlus 9 Pro, OnePlus 9
Xiaomi 11T Pro
Oppo Find X5, Oppo Find X3 Pro (CPH2173)
The above list includes devices specifically tested and confirmed by MED-EL to be compatible with AudioStream. In addition, other Android devices with Android 10 or later and both Bluetooth® Low Energy (BLE) and Audio Streaming for Hearing Aids (ASHA) technology enabled by the phone manufacturer and service carrier may also be compatible with AudioStream. Other Apple devices with iOS 11 or later and both Bluetooth® Low Energy (BLE) and Made for iPhone (MFi) technology enabled by the phone manufacturer and service carrier may also be compatible with AudioStream.
Devices Suitable for Bimodal Streaming
For bimodal streaming, you simply need an Android smartphone with the Android 12 operating system or later, a hearing aid with ASHA (Audio Streaming for Hearing Aid) technology, and an AudioStream. The below lists include devices specifically tested and confirmed by MED-EL to be suitable for bimodal streaming. Other Android devices and hearing aids with the necessary technologies may also be suitable for bimodal streaming when using AudioStream.
Google Pixel 7, Google Pixel 6, Google Pixel 5a, Google Pixel 5, Google Pixel 4a, Google Pixel 3a
Samsung Galaxy S22, Samsung Galaxy S21+, Samsung Galaxy S21, Samsung Galaxy S20 Ultra, Samsung Galaxy Z Fold2, Samsung Galaxy S10e, Samsung Galaxy Tab S7+
Xiaomi Mi 11T Pro
OnePlus 9 Pro
Oppo Find X5, Oppo Find X3 Pro
Oticon More, Widex Moment, Signia Pure Charge&Go T 7AX, Starkey Livio AI, ReSound Key, ReSound One, ReSound LiNX Quattro, ReSound ENZO Q, Beltone Imagine, Beltone Amaze, Beltone Rely, Beltone Boost Ultra
Although MED-EL aims to provide as many users as possible with seamless device compatibility, MED-EL cannot guarantee full compatibility or troubleshooting support with all devices and the information provided above should only be used for reference.
- Vaerenberg, B., Govaerts, P.J., Stainsby, T., Nopp, P., Gualt, A., & Gnansia, D. (2014). A uniform graphical representation of intensity coding in current-generation cochlear implant systems. Ear Hear. 35(5): 533–543
- Dorman, M.F. & Natale S.C. (2018). Auto-Adaptive: A noise level-sensitive beamformer for MED-EL cochlear implant patients. J Am Acad Audiol.
- O’Connell, B.P., Cakir, A., Hunter, J.B., Francis, D.O., Noble, J.H., Labadie, R.F., Zuniga, G., Dawant, B.M., Rivas, A., & Wanna, G.B. (2016). Electrode location and angular insertion depth are predictors of audiologic outcomes in cochlear implantation. Otol Neurotol. 37(8):1016–1023.
- O’Connell, B.P., Hunter, J.B., Haynes, D.S., Holder, J.T., Dedmon, M.M., Noble, J.H., Dawant, B.M., Wanna, G.B. (2017). Insertion depth impacts speech perception and hearing preservation for lateral wall electrodes. Laryngoscope. 127(10):2352-2357
- Rader, T., Döge, J., Adel, Y., Weissgerber, T., & Baumann, U. (2016). Place dependent stimulation rates improve pitch perception in cochlear implantees with single-sided deafness. Hear Res., 339, 94–103.
- Müller, J., Brill, S., Hagen, R., Moeltner, A., Brockmeier, S.J., Stark, T., Helbig, S., Maurer, J., Zahnert, T., Zierhofer, C., Nopp, P., & Anderson, I. (2012). Clinical trial results with the MED-EL fine structure processing coding strategy in experienced cochlear implant users.
- Killan, C., Scally, A., Killan, E., Totten, C., & Raine, C. (2019). Factors affecting sound-source localization in children with simultaneous or sequential bilateral cochlear implants.