If you want wired, open-back IEMs with a lightweight metal housing for motorcycle listening, choose Fosi Audio IM4; if you need a three-driver hybrid design with a cable and a broad set of included ear tips, choose FiiO FH3. Neither is wireless, so neither is a sensible choice for listening while riding: cables and traffic awareness matter. For stationary use around a motorcycle, or listening before and after a ride, the IM4 is my more appealing pick for its open-back design and tuning options.
• Fosi Audio IM4: Open-back design, 10mm dynamic driver, metal housing, and swappable nozzles; the trade-off is a wired connection and an open design that is not suited to blocking outside sound.
• FiiO FH3: One dynamic driver and two Knowles balanced-armature drivers, plus an around-the-ear fit and multiple ear-tip types; the trade-off is that its wired, in-ear design is not a wireless riding solution either.
• IM4 is for listeners who want an airy presentation and ways to adjust the fit and sound.
• FH3 is for listeners who want a three-driver hybrid setup and a supplied cable and accessory kit.
• For motorcycle riding, neither is my pick: both are wired in-ear earphones, not wireless ear clips or open-ear riding headphones.
The IM4 is a wired in-ear monitor built around a single 10mm dynamic driver with a beryllium-coated diaphragm. Fosi pairs it with a dual-chamber structure and N52 dual-magnet circuit. The distinctive feature for this comparison is its open-back design, which is intended to create a more spacious, airy presentation. That may appeal to someone who dislikes the sense of sound being sealed tightly around the ears during a listening session.
There is some practical flexibility in the box: three ear-tip styles, each in three sizes, and two nozzle materials, brass and aluminum alloy. The detachable 0.78mm 2-pin cable connection also lets owners replace the cable rather than treating it as fixed. Its full-metal housing weighs 7g per bud, a useful detail for anyone weighing comfort against a more substantial-feeling shell.
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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-14 · 6 min read · Independent comparison
The FH3 takes a different route: it combines one 10mm beryllium-plated dynamic driver with two Knowles balanced-armature drivers. A physical and electronic three-way crossover divides the work among them. In broad terms, the dynamic driver handles bass, while the balanced-armature drivers are assigned to the mids and highs. That arrangement makes the FH3 the more complex driver design on paper, though more drivers alone do not tell you which sound you will prefer.
Its aluminum-magnesium alloy shell has an around-the-ear fit. The included 1.2m cable uses silver-plated copper conductors and connects through a 3.5mm jack. FiiO also supplies 11 pairs of ear tips across four types and a carrying case, giving buyers more fit options in the package than the IM4’s listed tip selection. The FH3 is still a wired in-ear earphone, not a Bluetooth model.
The FH3 makes sense for someone who wants a hybrid driver layout, an around-the-ear wearing style, and a generous selection of included tips. I would pass if the main goal is open-back listening or a cable-free option for movement. Its shape and accessories may suit a commute or stationary listening, but they do not turn it into the best wireless ear clip headphones for motorcycle use. In fact, neither product fits that description.
• Want an open-back design → Fosi Audio IM4. Its open construction is the clearest point of difference, aimed at an airy, spacious listening character.
• Want a hybrid driver arrangement → FiiO FH3. It combines one 10mm dynamic driver with two Knowles balanced-armature drivers and a three-way crossover.
• Want to experiment with nozzle materials → Fosi Audio IM4. It includes brass and aluminum-alloy nozzles, along with three tip styles in three sizes.
• Want more included ear-tip options → FiiO FH3. Its package lists 11 pairs across four types, plus a case and an ear-tip brush.
• Want a detachable 0.78mm 2-pin cable connection → Fosi Audio IM4. The cable can be swapped for another compatible cable.
• Prefer an around-the-ear fit → FiiO FH3. That is the wearing style specified for the FH3.
• Looking for the best open ear headphones for motorcycle riding → Neither. Both are wired in-ear monitors; the IM4’s open-back construction does not make it an open-ear headphone.
• Looking for the best true wireless earbuds for motorcycle riding → Neither. Both rely on wired 3.5mm connections, and neither product sheet describes Bluetooth operation.
The distinction between “open-back” and “open-ear” is worth keeping straight. The IM4’s open-back design describes its earphone construction; it remains an in-ear product. That is not the same thing as an ear clip or a headphone that sits outside the ear canal. If your search is specifically for motorcycle riding, these are better treated as wired listening options for before or after the ride, not as riding gear.
My Verdict
I would choose the Fosi Audio IM4 for its open-back design, lightweight 7g-per-bud metal housing, and nozzle and tip options. That is my pick for relaxed, stationary listening around motorcycle trips—not for riding itself. If you specifically want a hybrid design and an around-the-ear fit, the FiiO FH3 has the more relevant feature set. For motorcycle riding, I would look beyond both wired in-ear models.
No. Both are wired earphones with a 3.5mm connection. Neither product sheet lists Bluetooth operation, so neither is a true wireless option.
I would recommend neither for listening while riding. Both are wired in-ear models, and the IM4’s open-back design does not make it an open-ear riding headphone. Consider them for stationary listening before or after a ride instead.
The specifications describe different approaches, not a universal sound-quality winner. The IM4 has one 10mm dynamic driver and an open-back design; the FH3 has one dynamic driver, two Knowles balanced-armature drivers, and a three-way crossover. Which presentation you prefer is personal.
The FH3 includes 11 pairs of ear tips across four types. The IM4 includes three tip styles in three sizes and adds two nozzle materials for another way to adjust its setup. Choose based on whether tip variety or nozzle swapping matters more to you.
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