Fosi Audio IM4 Open-Back In-Ear Monitors (Black)
The Fosi Audio IM4 Open-Back In-Ear Monitors bring wired portable listening to users who want spacious sound, secure comfort, and flexible tuning in a compact IEM. Its open-back acoustic structure helps reduce internal reflections and pressure buildup, supporting a more natural presentation for music, gaming, and focused listening at home or on the go.
Open-Back Wired Sound
The IM4 uses a 10 mm N52 dual magnet dual cavity dynamic driver with a PU beryllium-coated diaphragm. This driver system is built for clear detail, balanced output, and controlled dynamics without stacking multiple drivers. The open-back design and acoustic damping wool work together to reduce harsh resonance and create a wider listening feel than a conventional closed in-ear design.
Tunable Fit and Response
Listeners can fine-tune the sound with the included brass and aluminum nozzles. The aluminum nozzle supports added bass and reduced sibilance, while the brass nozzle supports clearer mids and treble. Three ear tip styles also let users choose a bass, deep bass, or balanced fit, making the IM4 adaptable for different music preferences and ear shapes.
Lightweight Aluminum Build
Each earbud weighs 7 g plus or minus 0.5 g and uses a 6063 CNC aluminum alloy shell with a smooth metal finish. The detachable 2-pin 0.78 mm cable connects to a 3.5 mm gold-plated plug, giving listeners a simple wired setup for compatible phones, DACs, players, computers, and audio gear.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Fosi Audio IM4 Open-Back In-Ear Monitors bring wired portable listening to users who want spacious sound, secure comfort, and flexible tuning in a compact IEM. Its open-back acoustic structure helps reduce internal reflections and pressure buildup, supporting a more natural presentation for music, gaming, and focused listening at home or on the go.
Open-Back Wired Sound
The IM4 uses a 10 mm N52 dual magnet dual cavity dynamic driver with a PU beryllium-coated diaphragm. This driver system is built for clear detail, balanced output, and controlled dynamics without stacking multiple drivers. The open-back design and acoustic damping wool work together to reduce harsh resonance and create a wider listening feel than a conventional closed in-ear design.
Tunable Fit and Response
Listeners can fine-tune the sound with the included brass and aluminum nozzles. The aluminum nozzle supports added bass and reduced sibilance, while the brass nozzle supports clearer mids and treble. Three ear tip styles also let users choose a bass, deep bass, or balanced fit, making the IM4 adaptable for different music preferences and ear shapes.
Lightweight Aluminum Build
Each earbud weighs 7 g plus or minus 0.5 g and uses a 6063 CNC aluminum alloy shell with a smooth metal finish. The detachable 2-pin 0.78 mm cable connects to a 3.5 mm gold-plated plug, giving listeners a simple wired setup for compatible phones, DACs, players, computers, and audio gear.
