They do sound good in open mode. When they're not covering your ear canals, the Aerofit 2 Pro rank among the best open earbuds in their price class, with an airy sound signature that naturally focuses on the upper registers. While no open earbuds I’ve tried accentuate bass as well as regular buds, the Aerofit 2 Pro have more resonance down low than most, accompanied by splashes of keen instrumental detail and clear stereo separation.

Wandering Noise

The biggest issue I have with these “best of both worlds” earbuds is noise cancellation that’s not only limited but also unstable and inconsistent. This is almost certainly due to the lack of eartips, which prevents a proper seal. There’s a reason all our favorite noise-canceling buds come with multiple eartip sizes to conform to your ear canals; a good seal is paramount to effective noise canceling.

High-register noises and midrange sounds are the worst offenders, especially voices. During one of my wife’s video calls, her voice seemed to constantly migrate from one ear to the other as the noise-canceling struggled to adjust to my head&...