Electric Acoustic Stimulation

If you have trouble hearing high-pitched sounds, discover how an Electric Acoustic Stimulation (EAS) system could give you the joy of sound.

What is EAS?

Are certain sounds easier to hear than others? Do people always sound as if they're mumbling? Do you feel that your hearing aids are just not good enough?

If this sounds familiar, you may be missing out on hearing high-pitched sounds. When you cannot hear high-pitched sounds, you have a type of hearing loss known as high-frequency hearing loss. This type of hearing loss is common, and the EAS treatment option is available for adults over the age of 18.

EAS is the combination of two technologies: cochlear implant technology for high-pitched sounds and hearing aid technology for low-pitched sounds. By using two different technologies in one device, you can hear the full range of sounds, making it much easier to chat with friends, enjoy music, and communicate in everyday life.

EAS Infographic
Low Frequency Sounds
High Frequency Sounds
Ear Anatomy SYNCHRONY 2 EAS 1 2 3

Low-Pitched Sounds—Hearing Aid Technology

  1. Sounds are detected by the microphones of the audio processor.
  2. Low-pitched sounds are made louder and sent through the earmold to the ear.
  3. These sounds are processed by the cochlea and sent to the brain.
Ear Anatomy SYNCHRONY 2 EAS 1 2 3

High-Pitched Sounds—Cochlear Implant Technology

  1. Sounds are detected by the microphones of the audio processor.
  2. High-pitched sounds are sent to the implant as electrical signals.
  3. These sounds are processed by the cochlea and sent to the brain.
Benefits of EAS

More Than Just Hearing

EAS is proven to give you better hearing. And better hearing has many more benefits for your lifestyle, including:

  • Easier to socialize with friends
  • Improved communication with family members
  • Better hearing in noisy settings, like restaurants
  • Easier listening on the phone
EAS System
EAS Hearing Preservation

The Perfect Match

Your SYNCHRONY EAS Implant System consists of two parts: the implant and the audio processor with an acoustic unit. The audio processor is worn on the outside of your head, sitting comfortably on your ear. It contains the microphones that pick up the sounds around you, and then sends these sounds to your implant and the earmold in your ear. You’ll wear your audio processor all day every day, except when you’re asleep.

The implant is surgically placed just under your skin and works with your audio processor to let you hear sounds as naturally as possible. This part of the system will be with you for many years to come, so you should keep the future in mind when choosing your implant.


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 high-resolution MRI safety,* SYNCHRONY 2 is the ideal implant for you.   

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SONNET EAS Audio Processor

Built For Everyday

Light and comfortable to wear, SONNET 2 EAS is your ideal audio processor. Its water-resistant design makes it practical for every day, and there are plenty of ways to make SONNET 2 match your personal style.

What’s more, with dual microphone technology, SONNET 2 EAS gives you better sound quality than ever before.

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The Next Steps

What can you expect next? Here’s an outline of the process of receiving a cochlear implant.



First, you’ll undergo routine assessments to ensure you’re a candidate for EAS and to identify if there are any additional factors to consider. Your clinical team will walk you and your family through the specifics of what to expect in the following steps.



The surgical procedure is straightforward and usually lasts between 1–2 hours either general anesthesia. Recipients are usually back on their feet the next day. Your hospital stay may last one or more days, depending on your individual needs and what’s typical in your area. 



Once the surgical site has healed, you’ll have your first fitting. This “activation day” is when your audiologist will turn on your audio processor for the first time, and you’ll hear your first new sounds. The audio settings of your processor will be adjusted to fit your hearing preferences.



After activation, it’s important to follow up with a rehabilitation program so that you can adapt to hearing with your EAS system. Rehabilitation is essential to make the most of your implant. Rehabilitation sessions can be done with a speech-language pathologist or auditory therapist, or if you prefer you can practice using at-home listening exercises with a partner.  

 User Stories
"My quality of life has changed tremendously since my implant"

* Recipients with a SYNCHRONY 2 Cochlear Implant may be safely MRI scanned at 1.5 and 3.0 Tesla following the conditions detailed in the instructions for use.

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Don’t wait any longer to take the next step. Our team of hearing professionals is ready to answer any questions you may have to help you decide what is right for you.

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