This is the one I reach for first. Two 10mm dynamic drivers per side split the work through an electronic crossover, with one dedicated to the bottom end and one to everything above it, which is why it has more weight and separation than a single driver at the same price. The four physical switches on each earpiece give sixteen tuning combinations with no app, no battery and no firmware — an unusual amount of control in a wired IEM. The transparent shell shows the drivers, which is partly why I bought it.
The default for music and for anything where I actually want to listen rather than just talk. Being wired, it plugs straight into the desktop without charging.
There are no independent third-party measurements of this model, so the published figures are catalogue numbers rather than verified results. The detachable cable uses a 2-pin connector, which is less universal than the 4-pin MMCX found on higher-end IEMs. The four switches are also fiddly to adjust in the dark, and the plastic housing is large enough that some ears find the fit awkward.