Name: Fosi Audio IM4 Open-Back In-Ear Monitor
Brand: Fosi Audio
SKU: 69dcb079aeed674aaaf6d9f1
Price: 899.0 HKD
Availability: InStock

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Fosi Audio IM4 Open-Back In-Ear Monitor

Fosi Audio 推出首款入耳式耳機「IM4」，融合品牌一貫的設計美學與音質追求，旨在從外觀到聽感，全面展現品牌核心精神。產品命名「IM4」巧取英文「I am for」之諧音，寓意「我支持・我擁護・我為……而生」，以開放式宣言傳遞為信念而發聲的設計理念。

在聲音調校方面，Fosi Audio的研發團隊經過多番聲學結構改良與組件測試，並廣泛徵集資深發燒友的實際聽感反饋，致力打造兼顧舒適性與耐聽度的聆聽體驗。IM4 具備跨曲風的廣泛適應力，無論是流行音樂、古典交響或是電子節拍，皆能呈現細膩而立體的表現，成就了全能型HiFi耳機之定位。

HK$899.00

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A new exploration designed for long-lasting comfort in sound and fit.

Power sound with 10mm driver
Boost dynamics via N52 magnets
Expand space with open-back design
Perfect Pairing with DS3 Mini Audio DAC

香港代理 Fosi Audio IM4 入耳式耳機

High-Performance Dynamic Unit

Engineered with an optimized dynamic driver and acoustic tuning for detailed sound (THD<1%)

Dual-Magnet Dual-Cavity

Rich Sound Details

A 10mm Be-PU driver for dense mid-Lows, brilliant highs, and a wide, detailed soundstage.

Be-PU Diaphragm

Hi-performance Single Driver, Pure Excellence

No driver stacking, just pure sound. IM4's single dynamic driver delivers coherent, layered, and authentically tuned audio.

Single Dynamic Driver

Perfect Balance of Acoustic Space

Dual-chamber control: a 9-port front for balance, a sealed rear for treble extension.

Dual-Chamber Design

Ensure pure Signal Transmission

4-strand 392-core 5N OFC silver-plated cable: excellent signal transmission and a stable gold-plated connection.

5N OFC Cable

Pocket-sized, Expansive Soundscape

Wide-open construction minimizes internal reflections and pressure buildup for an open, natural sound.

Open-Back Design

Acoustic Damping for Pure Sound

The rear chamber is filled with sound-damping material to eliminate resonance peaks and harshness.

Acoustic Damping

Ergonomic Build for Comfort

A Universal, comfortable fit, engineered from millions of ear scans for a secure and lightweight feel.

Ergonomic Design

Balanced Tuning Across Genres

Punchy bass, clear mids, and a spacious, sibilance-free treble. The IM4 is tuned for relaxed listening.

Balanced Tuning

Picture 1 without Ear Tips

Picture 2 with Balanced Ear Tips
Picture 3 with Bass Ear Tips
Picture 4 with Deep Bass Ear Tips

Orange line: Aluminum alloy Tube

Red line: Brass Tube

Enjoy All-day Comfort

Each earbud weighs only 7g, ensuring pressure-free comfort for long listening.

Hollow Structure Design

Two Bold Finishes

Black exudes understated elegance, while silver shines with refined brilliance.

Elegant Colors

Product details

Dual Magnet & Dual Chamber for Hi-Fi Sound: Experience audiophile clarity. Our IEM earphones feature an N52 dual magnet for powerful control and a dual-chamber design for balanced sound,The 10mm beryllium driver delivers wide soundstage and crisp details.
Balanced & Fatigue-Free Tuning:The open-back design and acoustic damping wool reduce resonance and harshness, creating a relaxed, wide sound. The hifi earbuds are expertly tuned for balanced bass, mids, and treble, making them ideal for audiophiles.
Ergonomic & Lightweight Comfort: Designed for all-day comfort. Its housings feature a smooth metal finish that's hypoallergenic and pleasant to the touch. With each earpiece weighing only 7g, these are among the most comfortable in-ear monitors for extended wear.
Premium CNC Aluminum crafts:Show Excellent build quality and minimalist aesthetics. The shell is precision-machined from a block of aluminum. The unique orange metal grille and logo add a distinctive, setting IEMs apart in both style and substance.
Customizable Sound & Detachable Cable:Tailor your audio experience. The IEMs set includes 3 types of eartips (Bass, Deep Bass, Balanced) and two sound nozzles (Brass, Aluminum) to fine-tune bass and treble. The 2-pin 0.78mm detachable cable to 3.5/4.4mm.

Specifications

Shell Material: 6063 CNC Aluminum Alloy
Driver Unit: 10 mm N52 Dual-Magnet Dual-Cavity Dynamic Driver
Diaphragm: PU Beryllium-coated Diaphragm
Sensitivity: 109dB
Impedance: 21Ω
Frequency Response: 20Hz–20kHz
Cable: 4-core 392-strand 5N OFC Silver-plated Copper Cable
Connector: 2-PIN 0.78mm
Audio Jack: 3.5 mm Gold-plated Plug
Weight (per earbud): 7g ±0.5g
Weight (incl. cable): 38g ±1g

What‘s in the box？

Fosi Audio IM4 Earphones
3.5mm Cable
Carrying Pouch
User Manual
Quick Guide
Brass Nozzle
Balanced Ear Tips
Bass Ear Tips
Deep Bass Ear Tips

1 year warranty

There is no additional details for this product.

Delivery Options

Taiwan Taoyuan
美國USA
Portugal (Shipping Durations: 7-14 working days)
S.F. Express - Office / Home Delivery
S.F. Express - EF Locker Pickup
S.F. - Business Station
S.F. Express - Store Pickup
Macau (S.F. Express/Driver delivery)
Self Pick-up (Lai Chi Kok)

Payment Options

Visa / MasterCard Credit Card
AlipayHK
FPS
Google Pay
Apple Pay
WeChat Pay HK
Bank Transfer／ATM
UnionPay

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