If you want Bluetooth streaming, Auracast, and hands-free calling, yes — Zeal is the only one of the two that offers any of that, and it also scored higher in our lab testing (4.3/5 vs 3.4/5 overall). If streaming doesn't matter to you, Silk IX delivers comparable speech-in-quiet performance for roughly $1,300 less.
Oticon Zeal vs. Signia Silk Charge&Go IX
Check out our comparison of the Oticon Zeal vs Signia Silk Charge&Go IX. Listen to audio samples and see how the two hearing aids differ in terms of sound performance, features, accessories, and more.
Published Updated
Quick Verdict
AI summarizedSummarized with AI assistance from our human-researched product information, in-lab testing, objective sound measurements, and expert ratings.
The real split here is wireless features versus price: Zeal adds Bluetooth streaming and Auracast for about $1,300 more, while Silk IX skips streaming entirely and scores notably lower on value (2.4/5) despite being the cheaper of the two.
Zeal
Choose the Oticon Zeal if you want Bluetooth LE Audio streaming (including Auracast) and hands-free calling in a nearly invisible CIC, and you're willing to pay roughly $1,300 more for a device that scored 4.3/5 overall with an A SoundGrade in our lab testing, including above-average speech-in-noise (2.9/5) and music streaming (3.3/5).
Silk Charge&Go IX
Choose the Signia Silk Charge&Go IX if you want a smaller price tag (about $1,300 less than the Zeal) and are fine giving up Bluetooth streaming entirely — Silk still delivers excellent speech-in-quiet performance (4.5/5) but scored 0.0/5 on streamed music since it simply doesn't stream audio.
What actually separates them
AI summarizedWireless streaming
SpecZeal offers full Bluetooth LE Audio streaming, hands-free calling, and Auracast broadcast support, while Silk IX has no Bluetooth streaming at all and scored 0.0/5 on music streaming in lab testing — it relies on non-audio wireless signals just to talk to its own app.
Overall lab performance and price
Expert ratingZeal earned a 4.3/5 HearingTracker score with an A SoundGrade versus Silk IX's 3.4/5 and B SoundGrade (ranked #25 of 35 prescription devices tested), but Zeal costs roughly $1,300 more per pair.
Speech-in-noise performance
Lab measuredZeal measured 2.9/5 for speech in noise versus Silk IX's 2.6/5 — both land above the site-wide average but neither is strong in absolute terms, so don't expect either to excel in genuinely noisy rooms.
Value score
Expert ratingBoth devices score well below the 3.6/5 site-wide average on value — Zeal at 3.2/5 and Silk IX at just 2.4/5 — meaning neither is priced to match its performance relative to the broader market.
Product Overview
Zeal
Silk Charge&Go IX
Form Factor
Form FactorNon-custom device that typically sits completely inside the ear canal. Some of the device may be visible to the naked eye.
Form FactorNon-custom device that typically sits completely inside the ear canal. Some of the device may be visible to the naked eye.
Expert Rating
Score
4.3
Score
3.4
User Rating
3.71 reviews
3.73 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.
MildModerateSevere
MildModerate
Product Features
Hands-freeRechargeableiPhoneAndroidIP68
Rechargeable
Expert Ratings
Compare comprehensive test results and expert opinions.
Zeal
Silk Charge&Go IX
HearingTracker Score
Zeal
4.3ABOVE AVERAGE
Oticon Zeal is an instant-fit, nearly invisible, rechargeable prescription hearing aid with AI-driven processing and modern Bluetooth LE Audio connectivity for Android and Apple iOS.
Read full reviewSilk Charge&Go IX
3.4AVERAGE
The Signia Silk Charge&Go IX is a groundbreaking, rechargeable completely-in-canal (CIC) hearing aid designed for people with mild to moderate hearing loss. It offers up to 28 hours of battery life, instant fit with soft silicone ear tips, and wireless control via the Signia app, but lacks Bluetooth streaming and can be challenging to handle due to its small size.
Read full reviewHearAdvisor SoundScore
Zeal
4.3ABOVE AVERAGE
Oticon Zeal achieved a SoundScore of 4.26/5 in HearAdvisor lab testing. The Prescription Hearing Aid category average SoundScore was 3.91/5.
Silk Charge&Go IX
3.7AVERAGE
Signia Silk Charge&Go IX achieved a SoundScore of 3.70/5 and a SoundGrade of B in HearAdvisor lab testing. It ranked #25 of 35 Prescription Hearing Aid devices tested. The Prescription Hearing Aid category average SoundScore was 3.91/5.
Build Quality
Zeal
5.0EXCELLENT
Zeal offer excellent moisture and dust protection with an ingress rating of IP68. Both the hearing aids and case are well build and ready for daily use.
Silk Charge&Go IX
4.7EXCELLENT
Signia Silk C&G IX have an impressive build quality, featuring a top-of-the-line IP68 ingress rating, which is crucial for nearly invisible hearing aids. They also come with a durable portable charging case.
Battery
Zeal
4.2ABOVE AVERAGE
With a battery life of up to 20 hours, Zeal should last you all day.
Silk Charge&Go IX
4.4ABOVE AVERAGE
Silk IX provide up to 20 hours of use per charge which is exceptional given their extremely small size. Recharging takes up to 4 hours, which is longer than some other models, but this isn't a significant drawback given their all-day battery life.
Bluetooth
Zeal
5.0EXCELLENT
I found Zeal to offer easy and stable wireless connection. Their audio quality while streaming music, and during hands-free calling, was good and comparable to other prescription hearing aids.
Silk Charge&Go IX
Not yet rated by our experts
App Features
Zeal
5.0EXCELLENT
I found the Companion app easy to navigate and use. Other prescription hearing aid companies offer more in-depth health features, but there is still plenty of opportunity to customize settings from your mobile device. The HearingFitness component is also a nice feature for those who like to actively track their progress.
Silk Charge&Go IX
3.4BELOW AVERAGE
While Silk IX hearing aids are not Bluetooth compatible, they still work with Signia's app using high-frequency coded signals. This is a valuable addition, although the communication is less stable than Bluetooth and the app offers fewer features compared to other Signia models.
Comfort
Zeal
4.8EXCELLENT
Oticon Zeal were extremely comfortable and lightweight in my ears. In general, hearing care providers can make numerous physical changes to prescription hearing aids like Zeal to improve comfort.
Silk Charge&Go IX
4.5EXCELLENT
I found Silk IX very comfortable for an instant-fit nearly invisible hearing aid. Your hearing care provider should ensure they are fitted for optimal comfort and hearing benefit.
Design
Zeal
5.0EXCELLENT
Zeal are sleek, easy to use, in-the-ear prescription hearing aids. They are nearly invisible in the ear which is extremely impressive given their battery life and wireless capabilities.
Silk Charge&Go IX
5.0EXCELLENT
Silk IX is another unique offering from Signia, featuring an instant fit design with silicone ear tips that is nearly invisible. Its extremely small and discreet design may, however, pose challenges for those with limited dexterity and or vision.
Value
Zeal
3.2BELOW AVERAGE
Oticon Zeal has a value score of 3.2/5 based on lab performance and public display price.
Silk Charge&Go IX
2.4BELOW AVERAGE
Signia Silk Charge&Go IX has a value score of 2.4/5 based on lab performance and public display price.
Handling
Zeal
5.0EXCELLENT
Zeal are easy to use and adjust with the Oticon Companion app. I had no issues making adjustments while testing them.
Silk Charge&Go IX
4.0AVERAGE
I did not run into any issues while using Silk IX hearing aids. They are very easy to use once setup by your hearing care provider. Silk also have large color indicators making it easy to distinguish the left from the right hearing aids.
Pro Support
Zeal
5.0EXCELLENT
Prescription hearing aids like Zeal are fit by hearing care providers so you should receive quality care. The Oticon Companion app also opens the possibility for remote programming and virtual follow-up appointments.
Silk Charge&Go IX
4.0ABOVE AVERAGE
You should receive quality hearing care and support from your provider. The Signia App should further enhance your experience with AI help and remote assistance should your provider offer telehealth services.
Lab Recordings
Listen to direct output recordings from our acoustic test lab.
Zeal
Silk Charge&Go IX
Busy CafeBusy CafeSpeech intelligibility improvement in loud environments
Hear this scene unaided, for comparison
Zeal
Silk Charge&Go IX
Quiet OfficeQuiet OfficeSpeech intelligibility improvement in quiet and moderate environments
Hear this scene unaided, for comparison
Zeal
Silk Charge&Go IX
Streaming MusicStreaming MusicStreaming music provides a full range of bass and treble
Hear this scene unaided, for comparison
Zeal
Silk Charge&Go IX
Lab recordings not yet available
HearingTracker partners with HearAdvisor to provide recordings and performance data from an acoustic laboratory that follows standard scientific procedures. All hearing aids are fitted and performance-tested for mild sloping to moderate hearing loss. All audio samples cutoff above 10kHz.
Accessories
Compatible accessories for each hearing aid
Zeal
Silk Charge&Go IX
Remote Control
None
miniPocket
Enables push-button remote control of hearing aid functions.
Signia App+2
The Signia App provides a remote control, directional hearing control, telecare access, and access to connectivity and streaming settings.
Hardware
Zeal
Silk Charge&Go IX
Bluetooth® AudioBluetooth® AudioThis hearing aid is capable of streaming Bluetooth® audio certain phones and/or devices.
- Made for iPhone (MFi)
- Android (ASHA)
- Bluetooth® Low Energy (LE)
- Bluetooth® Auracast™
No
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)
- Android (ASHA)
No
IP RatingIP RatingIP Ratings rate sealing effectiveness of hearing aids against intrusion from foreign solid matter (dirt, dust) and moisture.
IP68
No
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.
- Volume Control
- Change program
- Accept/end calls
- Tinnitus program
No
Software Features
Zeal
Silk Charge&Go IX
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.
24
16
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
e2e wireless 4.0e2e wireless 4.0Control coupling, synchronization, binaural directionality, Spatial Speech Focus, CROS/ BiCROS.
AI Noise RemovalAI Noise RemovalArtificial Intelligence is utilized to remove or modify background noise from the sound signal to help isolate speech for better speech understanding.
Neural Noise Suppression: 12 dB / 6 dBNeural Noise SuppressionThe Deep Neural Network is part of MoreSound Intelligence™, which gives precise analysis and balancing of the full sound scene.
No
Better Ear FocusBetter Ear FocusSome modern hearing aids can share sound from one ear to the other. In some cases the sound from the less noisy side can be shared to the other ear, enabling the listener to hear a cleaner sound in both ears.
Better-Ear PriorityBetter-Ear PrioritySome modern hearing aids can share sound from one ear to the other. In some cases the sound from the less noisy side can be shared to the other ear, enabling the listener to hear a cleaner sound in both ears.
No
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.
No
Binaural OneMic directionalityBinaural OneMic directionalityEach CIC receives the sound and information not only from its own microphone but also from the microphone of the other hearing aid. This creates a virtual four-microphone network, allowing the pair of hearing aids to create a directional beam. In addition, the natural pinnae effect of the outer ear supports this directionality and makes the listening experience even more natural.
Ear SimulationEar SimulationThe outer ear, or pinna, can have a significant effect on the frequency shape of sound arriving at your inner ear. Some hearing aids mimic the "pinna effect" when producing sound, to deliver more natural sound to the listener.
Virtual Outer Ear: 3 configurationsVirtual Outer EarThree realistic models of the ear pinna to provide better spatial balance.
No
Echo ReductionEcho ReductionThis feature improves speech audibility by reducing the “blurring” of speech sounds that can occur in the presence of echoes.
No
Auto EchoShieldAuto EchoShieldAutomatically creates a more comfortable hearing experience in high-reverb environments leading to increased speech clarity and natural room perceptions.
Extended bandwidthExtended bandwidthHearing aid provides amplification at frequencies (pitches) higher than the typical hearing aid.
Yes
12kHz
Extended Dynamic RangeExtended Dynamic RangeExtended dynamic range typically makes louder sound clearer. This may help with the reproduction of loud music or loud speech in a very noisy environment.
Clear DynamicsClear DynamicsClear Dynamics expands the input dynamic range, processing input sounds up to 113 dB SPL, to provide better sound quality without distortion and artifact at loud input levels, while still keeping the sound quality of soft input levels intact. Clear Dynamics has an operating range from 5 to 113 dB SPL. With speech cues preserved at high input levels, users enjoy a better listening experience without distortion even in loud environments. Clear Dynamics is especially valuable for users when listening to music or in conversations in busy, dynamic environments, where peaks can often be louder than the available input dynamic range.
Yes
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.
Feedback ShieldFeedback ShieldEmploys an ultra-fast and effective feedback management system that prevents feedback without compromising sound quality or audibility.MoreSound Optimizer™MoreSound Optimizer™MoreSound Optimizer (MSO) and Feedback shield work together to counteract acoustic feedback from the receiver to the microphone to prevent audible feedback and gain reductions.
Feedback cancellationFeedback cancellationHigh-speed monitoring and control of feedback risk in individual processing channels.
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.
Speech Rescue™Speech Rescue™Makes high frequency sounds more audible
No
Handling noise reductionHandling noise reductionReduces noises related to hearing aid movement on the ear and noises related to hands or objects touching the hearing aid while worn.
Wind & Handling StabilizerWind & Handling StabilizerWind & Handling Stabilizer detects and filters wind and handling noises 500 times per second. It selects the microphone with the cleanest sound input, preventing disruptive sound from entering the system. It then attenuates remaining wind and handling noises from the other microphone efficiently and only in the frequencies affected by the noise. This provides a cleaner sound for further processing in MSI 3.0, helping hearing aid users go about their day in comfort.
No
Listening ProgramsListening ProgramsNumber of manually accessible listening programs (using push button, remote, app, or other switching method)
4
6
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.
Adaptation ManagementAdaptation ManagementAdapts in 3 steps for gradual user acclimatization to a new hearing aid
No
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.
No
SoundSmoothing™: 3SoundSmoothing™Reduces the sound of clattering cutlery and rustling newspaper, etc.
Processing ChannelsProcessing ChannelsThese are all the frequency-divided sections the hearing aid is able to examine at a single time. The hearing aid uses this information to determine whether the contents of each section are noise, speech, or something else and amplify the sound in each section accordingly.
64
32
Soft Speech BoostSoft Speech BoostMore aggressive amplification for softer speech sounds
Soft Speech BoosterSoft Speech BoosterImproves soft speech understanding without turning up the volume.
No
Spatial AwarenessSpatial AwarenessListening to sound through hearing aids is not a natural experience, and your ability to tell where a sound is coming from may be impacted by the way sounds are amplified with hearing aids. Some hearing aids attempt to fix this problem by preserving cues to sound localization like between-ear level differences, etc.
Spatial Sound™: 4 estimatorsSpatial Sound™Improves ability to locate the most interesting sounds.
No
Spatial Noise CancellationSpatial Noise CancellationThis feature recognizes where sounds are coming from and can reduce noise coming from behind or to the side of the listener. This helps the listener focus on the speaker, usually in front of them.
Spatial Balancer: 100%Spatial BalancerSpatial Balancer increases the SNR by suppressing individual noise sources, placing them in the background and thereby creating a balanced sound scene.
No
Streaming Bass BoostStreaming Bass BoostBoosts bass when streaming audio
Power bassPower bassBoosts bass when streaming.
No
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.
SuddenSound Stabilizer: 6 ConfigurationsSuddenSound StabilizerSuddenSound Stabilizer monitors the sound environment and instantly adapts amplification to keep both soft and loud sudden sounds available, balanced, and comfortable.
No
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.
Tinnitus SoundSupport™Tinnitus SoundSupport™Select from a wide range of customizable tinnitus relief sounds that are dynamic, yet soothing — including broadband sounds (white, pink and red noise) and natural, ocean-like sounds.
Yes
Unique Amplification StrategyUnique Amplification StrategyHearing aids all process sounds a little bit differently. Sometimes it varies even within one model.
Environment classifierEnvironment classifierAllows clinician to determine where you need hearing help in your daily life.MoreSound Amplifier 3.0MoreSound Amplifier 3.0Sound processing occurs in an adaptive path setup that gives priority to resolution or speed, based on the current sound scene. Including SuddenSound Stabilizer that provides instant and balanced amplification of both soft and loud sudden sounds.MoreSound Intelligence 3.0MoreSound Intelligence 3.0Prevents wind and handling noise from entering the processing in the hearing aid for more comfort and better access to speech. Uses 4D Sensor technology to create a clearer and more distinct contrast between sounds, precisely organizing the spatial sound scene, and intelligently suppressing unwanted noise through the second-generation Deep Neural Network 2.0.Sound EnhancerSound EnhancerDynamic gain primarily for speech, given in complex environments.
Advanced Focus StreamsAdvanced Focus StreamsAdds up to 3 additional focus streams providing the correct amount of boost for each conversation partner's speech while allowing the wearer to stay connected to their environment.Dynamic Soundscape Processing 3.0Dynamic Soundscape Processing 3.0Integrates inputs for precise hearing aid optimzation, including (when available): acoustic sensors, motion sensors, OVP 2.0, noise detection, SNR analysis, and RealTime Conversation Enhancement.Speech & Noise ManagementSpeech & Noise ManagementReduces listening effort using sophisticated sound processing.SpeechStabilizerSpeechStabilizerPreserves the natural envelope of speech in any situation, including very
noisy situations, which preserves acoustic cues that are important for speech
understanding.
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 & Handling StabilizerWind & Handling StabilizerWind & Handling Stabilizer detects and filters wind and handling noises 500 times per second. It selects the microphone with the cleanest sound input, preventing disruptive sound from entering the system. It then attenuates remaining wind and handling noises from the other microphone efficiently and only in the frequencies affected by the noise. This provides a cleaner sound for further processing in MSI 3.0, helping hearing aid users go about their day in comfort.
eWindScreen binauraleWindScreen binauralBinaural processing of the audio signal (using Ultra HD e2e) delivers superb performance in asymmetrical wind environments.
Bottom Line
AI summarizedThe Verdict
Zeal is the stronger overall performer — a 4.3/5 HearingTracker score with an A SoundGrade, better speech-in-noise (2.9 vs 2.6/5), and actual music streaming (3.3/5) that Silk IX can't offer at all.
That gap justifies its roughly $1,300 premium if wireless connectivity and top-tier lab performance matter to you.
Which is right for you?
If you don't need Bluetooth streaming and want to spend less, Silk IX still delivers strong speech-in-quiet (4.5/5, matching Zeal) and up to 28 hours of battery life in a similarly discreet CIC shell. Just know its 2.4/5 value score and B SoundGrade mean you're paying CIC premium pricing without CIC-defying features.
What to ask at your fitting
AI summarizedAsk about candidacy for CIC fit
Both devices are best suited to mild-to-moderate loss (Zeal stretches to severe) and our review notes CIC styles can be harder to handle for anyone with dexterity or vision limitations — raise this with your provider before committing.
Test Auracast and calling if streaming matters
If hands-free calling or Auracast broadcasts are a priority, ask to demo Zeal's Bluetooth LE Audio in the clinic since Silk IX cannot do this at all.
Request real-ear measurement for either
Our lab found both devices needed professional REM tuning to reach their best scores — Zeal's speech-in-noise jumped to 2.9/5 and Silk IX's speech-in-quiet reached 4.5/5 only after tuning, so insist on it rather than accepting first-fit settings.
Frequently Asked Questions
AI summarizedNo. Silk IX has no Bluetooth audio streaming or hands-free calling — it scored 0.0/5 on our music streaming test because it simply doesn't stream. It uses non-Bluetooth wireless signals only to communicate with its companion app.
Zeal measured slightly better at 2.9/5 versus Silk IX's 2.6/5 in our lab testing, and both land above the site-wide average for hearing aids we've tested. Neither score is strong in absolute terms, though, so don't expect either device to excel in genuinely noisy environments.
Not especially — both score below the 3.6/5 site-wide average on value, with Zeal at 3.2/5 and Silk IX notably lower at 2.4/5. Zeal's higher price is offset somewhat by stronger lab performance and streaming features, while Silk IX's lower value score reflects CIC-level pricing without matching feature depth.
No, Auracast requires Bluetooth LE Audio support, which Silk IX does not have. The Oticon Zeal supports Auracast broadcast listening, which is one of its key advantages over Silk IX.