
Summary
In the initial fit condition with tulip domes, the JVC EH-Z1500 delivered above-average speech clarity in both quiet and noisy environments. Feedback handling was strong at 4.70/5, providing good stability out of the box. However, own-voice comfort measured below average at 2.40/5, indicating noticeable occlusion effects despite the open coupling. The overall initial fit score of 2.67/5 was above the category average, suggesting reasonable performance with minimal setup effort. Music streaming was not testable as the device lacks Bluetooth connectivity.
After tuning—while maintaining the same tulip dome coupling—speech performance improved substantially. Speech in quiet rose to an excellent 4.70/5, and speech in noise increased to 2.90/5, both well above category averages. This 0.58-point improvement in overall fit score demonstrates the device's responsiveness to optimization. The trade-off was reduced feedback stability (dropping to 3.80/5), a common consequence of increased gain. Own-voice comfort remained unchanged, suggesting the occlusion effects are inherent to the device's acoustic design rather than gain-dependent.
Lab Review Scores
State-of-the-art Acoustic Laboratory
Quality data starts with quality recordings. HearAdvisor worked with GRAS to build a no-compromise front end so every test is repeatable and reliable.

Lab recordings







