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Fosi Audio IM4 Open-Back In-Ear Monitor
The Fosi Audio IM4 is an open-back in-ear monitor designed for listeners who value clarity, balance, and long-term comfort. Its acoustic design focuses on natural sound reproduction with reduced listening fatigue, making it well suited for extended music sessions.
Built around a precision dynamic driver and a carefully engineered dual-chamber structure, the IM4 delivers a wide soundstage, controlled bass, and clear detail across the frequency range.
Features
- 10 mm dynamic driver with an N52 dual-magnet system for strong control and accurate sound reproduction
- Dual-cavity acoustic design that improves balance and separation across bass, midrange, and treble
- PU beryllium-coated diaphragm for fast response and crisp detail
- Open-back structure combined with acoustic damping wool to reduce resonance and harshness
- Balanced tuning intended for relaxed, fatigue-free listening over long sessions
- CNC-machined aluminum alloy shells with a smooth, hypoallergenic metal finish
- Lightweight construction at approximately 7 g per earpiece for comfortable extended wear
- Detachable 2-pin 0.78 mm cable design for easy replacement or upgrades
- Interchangeable sound nozzles and multiple ear tip styles for user-adjustable sound tuning
Specifications
- Shell material: 6063 CNC aluminum alloy
- Driver unit: 10 mm N52 dual-magnet dual-cavity dynamic driver
- Diaphragm: PU beryllium-coated
- Sensitivity: 109 dB
- Impedance: 21 Ω
- Frequency response: 20 Hz – 20 kHz
- Cable: 4-core, 392-strand 5N OFC silver-plated copper
- Connector type: 2-pin 0.78 mm
- Audio jack: 3.5 mm gold-plated plug
- Weight (per earbud): 7 g ±0.5 g
- Weight (including cable): 38 g ±1 g
What’s in the box
- Fosi Audio IM4 earphones
- 3.5 mm audio cable
- Carrying pouch
- User manual
- Quick guide
- Brass sound nozzle
- Balanced ear tips
- Bass ear tips
- Deep bass ear tips
Product Details
- Fosi Audio IM4
-
Brand New : Factory Sealed
- EFLC : 15465
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Warranty
Two Year Warranty
- Parts and Labour Warranty
- Canada-wide Coverage
- Fosi Audio Authorized
Returns
Peace of Mind Purchase
- Factory-sealed items are fully covered
- 10-day return window for unopened products
- Support available if there’s an issue on arrival
About Fosi Audio
Fosi Audio focuses on personal audio built for everyday listening, with a lineup that can include headphones, earbuds, portable DACs, and digital audio gear designed for clean sound and easy use. Whether you're listening at home, at work, or on the go, these products are made for practical comfort, reliable connectivity, and solid performance. We've been carrying Fosi Audio since 2020.
Explore our current Fosi Audio selection and best sellers. We offer both new and open-box items, and everything is clearly marked. Popular categories include Portable DACs & Headphone Amps, Amplifiers & Receivers, Earbuds.
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