
Summary
In the initial fit condition with closed sleeve coupling and NAL-NL2 fitting formula, the Horizon Go IX achieved a fit score of 3.01 out of 5, which is above the category average. The device excelled at music streaming (4.10) and demonstrated perfect feedback handling (5.00). Speech performance was solid in both quiet (3.20) and noise (2.20). The closed coupling contributed to below-average own-voice comfort (1.80), which may result in a hollow or boomy perception of one's own voice for some users.
After professional tuning with the same closed sleeve coupling, the fit score improved modestly to 3.21 out of 5. Speech understanding saw meaningful gains, with speech in quiet rising to 4.00 and speech in noise improving to 2.70. However, music streaming quality decreased to 2.70, suggesting a trade-off between speech optimization and audio fidelity. Own-voice comfort remained unchanged at 1.80, indicating the occlusion effect persists even with adjustment. Feedback handling remained strong at 4.40.
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