Summary
In the initial fit condition with a vented sleeve coupling, the MDHearing VoltMax delivered below-average speech intelligibility in quiet and struggled substantially in noisy environments, scoring in negative territory for speech in noise. Feedback handling was a standout at 5.0/5, indicating excellent stability without whistling. Own-voice comfort measured slightly above average, suggesting acceptable occlusion levels with the vented fitting. The overall initial fit score of 1.33/5 reflects well-below-average out-of-box performance compared to other OTC devices.
Switching to a closed sleeve coupling in the tuned fit condition yielded only modest improvements. Speech in quiet improved slightly to 2.0/5, while speech in noise remained well below average at -0.4/5. Feedback handling maintained its excellent 5.0/5 rating even with the more occluding coupling. Own-voice comfort decreased marginally to 2.4/5, a typical trade-off with closed fittings. The tuned fit score of 1.52/5 represents a 0.20-point improvement over initial fit but still falls below the category average.
Lab Review Scores
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