Fosi Audio IM4 Open-Back In-Ear Monitor/Headphones

Fosi Audio IM4

Open-Back In-Ear Monitor

Get 20% off on Kickstarter Now

Fosi Audio IM4

Open-Back In-Ear Monitor

Get 20% off on Kickstarter Now

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10mm PU Beryllium-coated Diaphragm

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PU ensures smooth mids and punchy lows, while the beryllium coating adds clarity and sparkle to high frequencies.

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N52 Dual-Magnet

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A powerful, stable magnetic field improves control and speed, delivering cleaner sound with better dynamics.

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Dual-Chamber Acoustic Design

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The front chamber’s nine-port design ensures balanced frequencies, while the rear chamber extends treble detail.

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Dual-Axis Ear Cup Arms

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Allows seamless vertical and horizontal rotation for a custom fit to different head shapes, enhancing both comfort and stability.

Stepless Silicone Adjustment

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OFC Silver-Plated Cable

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Braided with 4 strands of 392-core 5N high-purity OFC silver-plated wire, the cable offers excellent signal transmission and shielding for richly detailed sound.

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1.Open-Back Design

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Minimizes internal reflections and pressure buildup, creating a more open, natural sound with reduced fatigue.

2.Acoustic Damping

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he rear chamber is filled with acoustic damping material to absorb standing waves, reducing distortion and harshness.

3.Meticulous Tuning

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Tuned with listener feedback to ensure smooth, balanced sound across genres—ideal for relaxed, extended sessions.

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The headband features a silicone adjustment slider with a damped, smooth feel, enabling easy and precise positioning based on personal preference.

Durable Memory Metal Headband

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Made of high-strength memory metal, the headband maintains its shape over time. Lightweight and flexible, it reduces pressure and enhances comfort.

Breathable, Skin-Friendly Earpads

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Crafted with perforated leather and breathable fabric, the earpads stay cool and soft. Memory foam inside ensures all-day comfort without overheating.

10mm PU Beryllium-coated Diaphragm

PU ensures smooth mids and punchy lows, while the beryllium coating adds clarity and sparkle to high frequencies.

N52 Dual-Magnet

A powerful, stable magnetic field improves control and speed, delivering cleaner sound with better dynamics.

OFC Silver-Plated Cable

Braided with 4 strands of 392-core 5N high-purity OFC silver-plated wire, the cable offers excellent signal transmission and shielding for richly detailed sound.

Dual-Chamber Acoustic Design

The front chamber’s nine-port design ensures balanced frequencies, while the rear chamber extends treble detail.

Refined Metal Finish Skin-Friendly Comfort

Crafted from CNC-machined aluminum alloy with a sandblasted and anodized finish, it offers a smooth touch that’s gentle on the skin.

Lightweight Design Only 7g per Earbud

The hollowed structure cuts weight to just 38g with the cable, ensuring pressure-free comfort for long listening.

Ergonomic Shell Contoured for Ear

Developed with insights from millions of hearing-aid fitting samples, the ergonomic housing adapts to diverse ear shapes, delivering a secure and seamless fit.

Sound Nozzles

Comes with both aluminum alloy and brass nozzles. Aluminum reduces sibilance with added bass; brass enhances mids and treble with clarity.

Tuning Ear Tips

Includes three tuning sets — balanced, bass, and deep bass — each available in small, medium, and large sizes.

2-Pin 0.78mm Cable

The detachable 2-pin design supports 3.5mm and 4.4mm cable upgrades, allowing flexible customization.

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Fosi Audio IM4

Get 20% off on Kickstarter Now

Fosi Audio IM4

Get 20% off on Kickstarter Now

Your heading text goes here

10mm PU Beryllium-coated Diaphragm

Your heading text goes here

N52 Dual-Magnet

Your heading text goes here

Dual-Chamber Acoustic Design

Dual-Axis Ear Cup Arms

Stepless Silicone Adjustment

Your heading text goes here

OFC Silver-Plated Cable

Your heading text goes here

1.Open-Back Design

2.Acoustic Damping

3.Meticulous Tuning

Durable Memory Metal Headband

Breathable, Skin-Friendly Earpads

10mm PU Beryllium-coated Diaphragm

N52 Dual-Magnet

OFC Silver-Plated Cable

Dual-Chamber Acoustic Design

Refined Metal Finish Skin-Friendly Comfort

Lightweight Design Only 7g per Earbud

Ergonomic Shell Contoured for Ear

Sound Nozzles

Tuning Ear Tips

2-Pin 0.78mm Cable

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