Our lab tested the Signia Styletto AX using standardized measurements on an acoustic manikin to evaluate speech clarity, streaming quality, and feedback control. This independent review presents the complete findings for this slim rechargeable behind-the-ear hearing aid.
Dr. Steve Taddei, Au.D. — Lab Director & Reviewer
Dr. Abram Bailey, Au.D. — Fact Checker / Editor
The Signia Styletto AX delivers strong speech clarity in quiet settings and a sleek rechargeable design for style-conscious premium buyers.
Top 53% of Prescription Hearing AidOur testing measures speech in quiet, speech in noise, music streaming, own-voice naturalness, and feedback control. The score card below shows how the Signia Styletto AX performed on each metric using our 0-5 scale. 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 Signia Styletto AX.
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.
Bottom Line
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 Data
The graph below displays real-ear insertion gain measured on our acoustic manikin. It shows how closely the Signia Styletto AX matched prescribed amplification targets across the frequency range.
Audio Samples
We recorded audio through the Signia Styletto AX using a standardized manikin setup. The samples below let you compare what the hearing aid captured against our unaided reference recording.
How this hearing aid sounds in our lab scenes. Compare it out of the box and after professional tuning.
Scene type: Conversation
164 lab recordings of this product. They demonstrate relative processing in our lab and cannot predict an individual fitting outcome.
Test Documentation
The notes below document the specific settings and equipment used during our evaluation. This information provides transparency into how we tested the Signia Styletto AX in our lab.
In initial fit testing with sleeve vented coupling, the Styletto AX achieved a normalized score of 4.2/5. Speech-in-quiet measured 3.6/5 while speech-in-noise came in at 2.0/5. Feedback handling performed well at 4.2/5, with own-voice comfort at 3.1/5 and music streaming at 3.0/5. This out-of-box configuration delivers solid overall performance with particular strength in feedback control, though speech understanding in noise remains limited.
After professional tuning with the same sleeve vented coupling, the normalized score improved to 4.4/5—a 0.2-point gain over initial fit. Speech-in-quiet rose to 4.0/5 and speech-in-noise improved to 2.3/5. Feedback handling settled at 3.9/5, while own-voice comfort measured 3.0/5 and music streaming reached 3.1/5. The tuned configuration shows measurable speech clarity improvements while maintaining solid performance across other metrics.
Initial Fitting | Tuned Fitting | |
|---|---|---|
| Ear Coupling | Sleeve Vented | Sleeve Vented |
