HearAdvisor's independent lab tested the Oticon Zeal using standardized acoustic measurements and real-ear verification. This review presents objective performance data across speech clarity, noise handling, streaming quality, and fit comfort.
Dr. Steve Taddei, Au.D. — Lab Director & Reviewer
Dr. Abram Bailey, Au.D. — Fact Checker / Editor
The Oticon Zeal delivers excellent speech clarity in quiet environments, best suited for those prioritizing discreet, invisible-in-ear design.
Top 12% of Prescription Hearing AidThese five metrics measure speech-in-quiet clarity, speech-in-noise intelligibility, own-voice naturalness, feedback control, and streaming audio quality. The purple SoundScore graph is the overall result, and the five graphs after it break it into individual measurements for the selected fit. Each curve shows how scores are spread across all tested hearing aids, and the dot and number mark the score for Oticon Zeal.
Every hearing aid is lab-tested in two states — as it sounds out of the box, and after professional tuning. Switch fits to update the five metric graphs below.
How clearly speech comes through in calm, one-on-one surroundings.
Speech understanding against loud background noise — the toughest everyday test.
How natural your own voice sounds while wearing the aids, without a boomy, plugged-up quality.
Sound quality of music streamed to the hearing aids over Bluetooth.
Resistance to the whistling and squealing caused by acoustic feedback.
Lab Assessment
Quality data starts with quality recordings. HearAdvisor worked with GRAS to build a no-compromise front end so every test is repeatable and reliable.
Amplification Analysis
Insertion gain shows how much amplification the hearing aid provides at each frequency. The graph below compares the Zeal's measured output against prescriptive targets for a standardized hearing loss.
Audio Evidence
These samples were captured through an acoustic test manikin wearing the Zeal under controlled laboratory conditions. A reference recording without amplification is included for direct comparison.
How this hearing aid sounds in our lab scenes. Compare it out of the box and after professional tuning.
Scene type: Conversation
156 lab recordings of this product. They demonstrate relative processing in our lab and cannot predict an individual fitting outcome.
Test Documentation
Our technicians documented observations from both Initial and Tuned fit conditions during testing. Below you'll find the specific test configuration and any notable fitting details recorded in the lab.
In Initial Fit testing with a closed vented dome and NAL-NL2 fitting formula, the Oticon Zeal achieved a normalized score of 4.7/5. Speech in quiet measured an excellent 4.7/5, while speech in noise came in at 2.7/5. Music streaming performed well at 4.1/5. Feedback handling scored a solid 3.8/5, and own-voice comfort registered at 2.0/5. These results suggest strong out-of-box speech clarity with some compromise in own-voice naturalness.
After professional tuning—still using a closed vented dome with NAL-NL2—the Zeal maintained its normalized score of 4.7/5. Speech in quiet improved to an excellent 4.9/5, and speech in noise rose to 3.0/5. Feedback handling decreased slightly to 3.3/5, while music streaming dropped to 3.3/5. Own-voice comfort remained at 2.0/5. The tuning process enhanced speech intelligibility metrics while maintaining overall balance.
Initial Fitting | Tuned Fitting | |
|---|---|---|
| Ear Coupling | Closed Vented Dome | Closed Vented Dome |
| Receiver | 75 | 75 |
| Fitting Formula | NAL-NL2 | NAL-NL2 |
| Listening Program | General (Automatic) | General (Automatic) |
| Volume Setting | Manufacturer defaults | Adjusted to match NAL-NL2 targets at 55, 65, and 75 dB SPL |
| Software Version | Firmware v1.0.0 | Firmware v1.0.0 |
| Tuning Adjustments | Programmed to N3 audiogram, Feedback calibrated, Acclimatization at 3/3, Other settings at manufacturer defaults | Programmed to N3 audiogram, Feedback calibrated, Acclimatization at 3/3, Other settings at manufacturer defaults |
| Notes | n/a | n/a |
