ReSound Enzo IA vs. ReSound Key

Check out our comparison of the ReSound Enzo IA vs ReSound Key. Listen to audio samples and see how the two hearing aids differ in terms of sound performance, features, accessories, and more.

ReSound Enzo IA BTE 9
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$4,598 per pair
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ReSound Key RIE 61 4
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$2,799 per pair
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Product Overview

Form Factor
Behind The Ear - Super PowerForm FactorThis super-powerful type of hearing aid is fitted behind the ear and connects via tubing to a custom-fitted mold inside the ear.
Receiver In The EarForm FactorThis type of hearing aid sits behind the ear. A wire runs along the top of the ear and down to a speaker sitting inside the ear canal. An custom-fitted mold may be required.
Expert Rating
User Rating
3.7
1 reviews
Hearing Loss LevelHearing Loss LevelThis represents HearingTracker's best guess on suitability. Please consult a licensed audiologist to confirm your own candidacy for this device.
MildModerateSevereProfound
MildModerateSevereProfound
Product Features
Hands-freeRechargeableiPhoneAndroidTelecoilIP68
Hands-freeRechargeableiPhoneAndroidTelecoilIP58

Accessories

Compatible accessories for each hearing aid

3.5mm Line to Streaming
Multi Mic+

Multi Mic+

3.5mm Line to Streaming+3

The Multi-Mic+ is a versatile wireless accessory designed to help hearing aid users hear more clearly in challenging situations. It can be clipped onto clothing or worn on a lanyard to pick up a speaker’s voice and stream it directly to compatible hearing aids, or it can be placed on a table to capture group conversations in “table mode.” In addition to acting as a remote microphone, the Multi-Mic+ connects to other audio sources through a built-in telecoil, FM receiver (optional), or a standard 3.5 mm line-in cable, allowing users to stream sound from loop systems, FM transmitters, computers, TVs, or other devices. With a streaming range of up to 25 meters (82 feet), automatic mode switching, volume controls, and app integration, it provides flexible, high-quality sound input across a wide variety of listening environments

Multi Mic

Multi Mic

3.5mm Line to Streaming+3

A flexible remote microphone that can either be clipped to clothes or used as a tabletop mic for meetings. Use the mini-jack input for streaming audio from a music player to your hearing aids.

Battery Charger
Desktop Charger (Enzo IA)

Desktop Charger (Enzo IA)

Battery Charger

The Desktop Charger (CFF90) is a simple plug-and-play charging solution that comes with a USB-C cable and features LED status lights for easy monitoring.

Charger

Charger

Battery Charger
Bluetooth Streamer
Unite Phone Clip+

Unite Phone Clip+

Bluetooth Streamer+2

Small enough to clip onto your shirt collar, it streams phone calls and audio to your hearing aids from any Bluetooth-enabled mobile phone or smartphone.

FM to Digital Streaming
Multi Mic+

Multi Mic+

FM to Digital Streaming+3

The Multi-Mic+ is a versatile wireless accessory designed to help hearing aid users hear more clearly in challenging situations. It can be clipped onto clothing or worn on a lanyard to pick up a speaker’s voice and stream it directly to compatible hearing aids, or it can be placed on a table to capture group conversations in “table mode.” In addition to acting as a remote microphone, the Multi-Mic+ connects to other audio sources through a built-in telecoil, FM receiver (optional), or a standard 3.5 mm line-in cable, allowing users to stream sound from loop systems, FM transmitters, computers, TVs, or other devices. With a streaming range of up to 25 meters (82 feet), automatic mode switching, volume controls, and app integration, it provides flexible, high-quality sound input across a wide variety of listening environments

Multi Mic

Multi Mic

FM to Digital Streaming+3

A flexible remote microphone that can either be clipped to clothes or used as a tabletop mic for meetings. Use the mini-jack input for streaming audio from a music player to your hearing aids.

Remote Adjustments
ReSound Smart 3D app

ReSound Smart 3D app

Remote Adjustments+2

Adjusts sound, volume and balance settings, tinnitus settings, and allows your provider to make remote adjustments to your hearing aid programs.

Remote Control
Unite Remote Control 2

Unite Remote Control 2

Remote Control

Gives you push-button control of volume and program settings on your hearing aids and lets you manage streaming accessories.

Unite Phone Clip+

Unite Phone Clip+

Remote Control+2

Small enough to clip onto your shirt collar, it streams phone calls and audio to your hearing aids from any Bluetooth-enabled mobile phone or smartphone.

ReSound Smart 3D app

ReSound Smart 3D app

Remote Control+2

Adjusts sound, volume and balance settings, tinnitus settings, and allows your provider to make remote adjustments to your hearing aid programs.

ReSound Smart 3D app [Watch]

ReSound Smart 3D app [Watch]

Remote Control+1
Control+

Control+

Remote Control+1
Remote Microphone
Multi Mic+

Multi Mic+

Remote Microphone+3

The Multi-Mic+ is a versatile wireless accessory designed to help hearing aid users hear more clearly in challenging situations. It can be clipped onto clothing or worn on a lanyard to pick up a speaker’s voice and stream it directly to compatible hearing aids, or it can be placed on a table to capture group conversations in “table mode.” In addition to acting as a remote microphone, the Multi-Mic+ connects to other audio sources through a built-in telecoil, FM receiver (optional), or a standard 3.5 mm line-in cable, allowing users to stream sound from loop systems, FM transmitters, computers, TVs, or other devices. With a streaming range of up to 25 meters (82 feet), automatic mode switching, volume controls, and app integration, it provides flexible, high-quality sound input across a wide variety of listening environments

Multi Mic

Multi Mic

Remote Microphone+3

A flexible remote microphone that can either be clipped to clothes or used as a tabletop mic for meetings. Use the mini-jack input for streaming audio from a music player to your hearing aids.

Micro Mic

Micro Mic

Remote Microphone

A matchbook-sized remote wireless microphone that lets you hear from a distance up to 80 feet away.

Smartphone App
ReSound Smart 3D app

ReSound Smart 3D app

Smartphone App+2

Adjusts sound, volume and balance settings, tinnitus settings, and allows your provider to make remote adjustments to your hearing aid programs.

Control+

Control+

Smartphone App+1
Smartphone Streamer + Hands Free
Unite Phone Clip+

Unite Phone Clip+

Smartphone Streamer + Hands Free+2

Small enough to clip onto your shirt collar, it streams phone calls and audio to your hearing aids from any Bluetooth-enabled mobile phone or smartphone.

Smartwatch App
ReSound Smart 3D app [Watch]

ReSound Smart 3D app [Watch]

Smartwatch App+1
Telecoil Streamer
Multi Mic+

Multi Mic+

Telecoil Streamer+3

The Multi-Mic+ is a versatile wireless accessory designed to help hearing aid users hear more clearly in challenging situations. It can be clipped onto clothing or worn on a lanyard to pick up a speaker’s voice and stream it directly to compatible hearing aids, or it can be placed on a table to capture group conversations in “table mode.” In addition to acting as a remote microphone, the Multi-Mic+ connects to other audio sources through a built-in telecoil, FM receiver (optional), or a standard 3.5 mm line-in cable, allowing users to stream sound from loop systems, FM transmitters, computers, TVs, or other devices. With a streaming range of up to 25 meters (82 feet), automatic mode switching, volume controls, and app integration, it provides flexible, high-quality sound input across a wide variety of listening environments

Multi Mic

Multi Mic

Telecoil Streamer+3

A flexible remote microphone that can either be clipped to clothes or used as a tabletop mic for meetings. Use the mini-jack input for streaming audio from a music player to your hearing aids.

TV Streamer
ReSound TV Streamer+

ReSound TV Streamer+

TV Streamer

The ReSound TV-Streamer+, which supports Bluetooth Auracast, streams high-quality sound with speech clarity directly to your hearing aids at the volume you prefer.

Unite TV Streamer 2

Unite TV Streamer 2

TV Streamer

Streams stereo sound from the television directly to your hearing aids from up to 22 feet away.

Hardware

Bluetooth® AudioBluetooth® AudioThis hearing aid is capable of streaming Bluetooth® audio certain phones and/or devices.
  • Bluetooth® Low Energy (LE)
  • Bluetooth® Auracast™
  • Made for iPhone (MFi)
  • Android (ASHA)
Disposable BatteriesDisposable BatteriesCommon disposable batteries last anywhere from a few days to two weeks or more. For more information Google "how long do hearing aid batteries last" and click on the Hearing Tracker link.
No
13
Hands-Free CallingHands-Free CallingIt is possible to have a hands-free phone call with this hearing aid. You are not required to hold the phone up to your mouth.
  • Made for iPhone (MFi)
  • Bluetooth® Low Energy (LE)
  • Accessory required
IP RatingIP RatingIP Ratings rate sealing effectiveness of hearing aids against intrusion from foreign solid matter (dirt, dust) and moisture.
IP68
IP58
Push ButtonPush ButtonThe hearing aid features a push button which allows toggling across different sound processing programs
  • Program control
  • Program control
  • Volume Control
Rechargeable BatteriesRechargeable BatteriesCharge your batteries overnight in a docking station and get a full day's use (in most cases) of battery life the following day.
Lithium-ion
Lithium-ion
Tap ControlsTap ControlsThe hearing aid may be controlled by physically tapping it with your fingers.
  • Accept/end calls
No
TelecoilTelecoilThe hearing aid is able to pick up audio from landline telephones or public audio systems without using its acoustic microphones. This minimizes background noise and improves clarity and understanding, even over great distances. At performing arts venues, events, government meetings, etc., look for assistive listening systems (hearing loop, FM, and infrared systems), which must be provided at no cost under the Americans with Disabilities Act (ADA) and other international regulations.
Yes
Yes
Volume RockerVolume RockerA volume rocker or wheel to allows the adjustment of volume with a finger.
Yes
Yes

Software Features

Adjustment BandsAdjustment BandsThese are frequency-divided sections that can be adjusted in a hearing aid in order to amplify sounds. Although there are rarely more than 10 frequencies measured in a hearing assessment, having more bands that can be adjusted may allow for improved speech understanding and user comfort.
17
6
Adjustment SynchronizationAdjustment SynchronizationThis feature allows for a more pleasant listening experience by ensuring that both hearing aids process sound the same way. If one hearing aid changes its processing in response to noise or speech, it will send a wireless signal to the other hearing aid so both process sound in the same way.
No
Yes
Automatic Phone ProgramAutomatic Phone ProgramHearing aids with this feature can detect when a phone is placed near them and automatically switch to a phone program. In this setting, the hearing aids will reduce background noise and increase the volume of the phone.
No
Yes
Bass BoostBass BoostExtra amplification for lower tones.
No
Low Frequency Boost: Basic
DirectionalityDirectionalityDepending on the types and number of microphones a hearing aid has, the hearing aid may be able to boost sounds from specific directions (by reducing sounds from other directions). This can be helpful to focus on a speaker directly in front of the hearing aid user, as well as to give the user information about where different sounds are coming from.
Yes
Yes
Environmental AdaptationEnvironmental AdaptationThe hearing aid can detect different acoustical environments, like speech in noise, and adjust the sound of the hearing aid accordingly to drive comfort or speech understanding, etc.
Yes
Yes
ExpansionExpansionExpansion reduces audibility for very soft sounds. This can help to remove microphone noise, which is generated by soft environmental sounds.
3 settings
On/Off
Feedback SuppressionFeedback SuppressionIf any sound amplified by the hearing aid escapes the ear canal, it may reach the hearing aid’s own microphone and cause a harsh whistling noise. Some hearing aids are able to recognize when this feedback occurs and reduce or eliminate it.
Yes
Yes
Frequency LoweringFrequency LoweringUnderstanding certain speech sounds is dependent on the high frequency parts of these sounds. For individuals with high frequency hearing loss, this feature can take high frequency speech information and move it to lower frequencies where it will be audible.
Yes
No
Listening ProgramsListening ProgramsNumber of manually accessible listening programs (using push button, remote, app, or other switching method)
Fully flexible programs: 4
Fully flexible programs: 4
New User AdaptationNew User AdaptationProvider may set the hearing aid to gradually get louder over the first few weeks or months of a new hearing aid fitting. This can be convenient for new users who want to experience maximum benefit without making a lot of trips to the provider for tune ups.
Yes
Yes
Noise ReductionNoise ReductionThis feature uses modern hearing aids’ processing power to examine the incoming sound signal, determine if noise is present and reduce the volume of the troublesome sound to increase comfort.
NoiseTracker™ II: 5 settings
NoiseTracker™ II: On/Off
Phone Ear FocusPhone Ear FocusWhen on a phone call, some hearing aids can focus amplification on the phone ear and reduce amplification in the non-phone ear.
No
Yes
Power On DelayPower On DelayWhen you close the battery door to turn on your hearing aid, the hearing aid won't start producing sound for a certain amount of time. This can alleviate whistling (feedback) sound that sometimes occurs while inserting your hearing aid.
No
Yes
Sudden Loud Noise ReductionSudden Loud Noise ReductionThis feature detects loud sounds and reduces their volume to a comfortable level. Though not a replacement for hearing protection, this technology can greatly improve listener comfort.
Impulse Noise Reduction: 3 settings
Impulse Noise Reduction: On/Off
Tinnitus ReliefTinnitus ReliefTinnitus, or ringing in the ears, can be addressed by hearing aids in several different ways, such as introducing a soft therapeutic signal or targeted notched noise.
Yes
Yes
Unique Amplification StrategyUnique Amplification StrategyHearing aids all process sounds a little bit differently. Sometimes it varies even within one model.
No
WARP compression: 12
Wind Noise ReductionWind Noise ReductionAs wind blows against the microphones of hearing aids, unpleasant noise may be generated. Some hearing aids have the ability to recognize this wind noise and reduce its level. Such reductions may also affect the audibility of desired sounds, like speech.
Wind Guard: 3 settings
Wind Guard: On/Off