Eargo 6 vs MDHearing VoltMax
Side-by-side HearAdvisor lab results with SoundGrades, expert pick badges, and the same visualizations we use in product reviews.

Eargo 6
The Eargo 6 is a premium-priced OTC hearing aid ($2,250) that earns a B grade with a SoundScore of 3.4/5 in our lab testing. This invisible-in-ear device ranks #42 of 65 OTC hearing aids tested, placing it in the top 63% of its category. In our standardized testing, the Eargo 6 demonstrates solid speech clarity in quiet environments, scoring 3.3/5—notably 0.53 points above the OTC category average. Own-voice comfort also performs above category average at 2.9/5, which may benefit users sensitive to the sound of their own voice. However, the device shows limitations in challenging listening situations, with speech-in-noise performance scoring 1.0/5, falling 0.48 points below the category average. A significant limitation is music streaming, which scores 0.0/5—well below the category average by 1.92 points. Users who prioritize streaming audio content should consider alternatives. Feedback handling scores 3.3/5, which is solid in absolute terms though 1.24 points below the category average of 4.54/5. The Eargo 6 may appeal to users prioritizing a completely invisible form factor and solid quiet-environment performance. However, at its premium price point, alternatives like the Sony CRE-C10 offer stronger overall performance at a lower price. The rechargeable battery adds convenience, but buyers should weigh the device's limitations in noise and streaming against its aesthetic benefits.

MDHearing VoltMax
The MDHearing VoltMax is a behind-the-ear OTC hearing aid priced at $699, earning a B grade with a SoundScore of 3.0/5 in our lab testing. This places it in the lower tier of the OTC hearing aid category, ranking 62nd out of 65 devices tested. In our testing, the VoltMax delivered mixed results across key performance areas. Its standout strength is excellent feedback handling, scoring a perfect 5.0/5—above the category average by 0.46 points. This means users can expect stable performance without whistling or squealing during typical daily activities. However, speech clarity proved challenging, with speech-in-quiet scoring 1.9/5 (0.93 points below category average) and speech-in-noise at 1.0/5 (0.48 points below average). Own-voice comfort measured 2.4/5, slightly below the category norm. A significant limitation is music streaming, which scored 0.0/5—nearly 2 points below the category average. Users who prioritize phone streaming for calls or media should consider alternatives. The device features rechargeable batteries, offering convenience over disposable options. At this price point, several competitors deliver substantially stronger overall performance. The VoltMax may appeal to budget-conscious consumers who primarily need basic amplification with reliable feedback control and don't require streaming capabilities. Those seeking better speech clarity or music streaming should explore higher-scoring options in this price range.
Performance metrics
Scale 1-5 (Tuned)
Lab metric by fit
Scale 1-5 (Tuned)
Speech level
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Amplification (REIG)
Insertion gain at 65 dB (Tuned)
Audio scenes
Recorded samples (Tuned)
Fitting configuration for tuned fit