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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 : 15472
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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
- 20-day return window for unopened products
- Support available if there’s an issue on arrival
About Fosi Audio
Fosi Audio offers a focused lineup selected for practical features and long-term value. 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 DACs & Digital Converters, Portable DACs & Headphone Amps, Amplifiers & Receivers.
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