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  • 2 VIDEOS
  • Fosi Audio IM4 Open-Back HiFi IEM Earphones, 10mm Beryllium Driver, N52 Dual Magnet & Dual Chamber, 2-Pin Detachable Cable 3.5/4.4mm Balanced, Custom Tuning, Ergonomic Fit for Studio/Music/Gaming
  • Reveal a World of New Detail of the IM4 HeadphoneFosi Audio Direct

Fosi Audio IM4 Open-Back HiFi IEM Earphones, 10mm Beryllium Driver, N52 Dual Magnet & Dual Chamber, 2-Pin Detachable Cable 3.5/4.4mm Balanced, Custom Tuning, Ergonomic Fit for Studio/Music/Gaming

4.3 out of 5 stars (22)
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About this item

  • 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.
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This item: Fosi Audio IM4 Open-Back HiFi IEM Earphones, 10mm Beryllium Driver, N52 Dual Magnet & Dual Chamber, 2-Pin Detachable Cable 3.5/4.4mm Balanced, Custom Tuning, Ergonomic Fit for Studio/Music/Gaming
$139.99
Get it by Wednesday, Mar 18
In Stock
Sold by Fosi Audio and ships from Â鶹Çø Fulfillment.
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$109.99
Get it by Wednesday, Mar 18
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  2. Guided by our mission of "Redefining HiFi with Unmatched Value", Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide.

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Product Description

fosi audio IM4

Open-Back In-Ear Monitor

Fosi Audio IM4

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

Which Fosi Audio headphone or headphone amp is right for you?

Fosi Audio i5

Q4

SK01

SK02

DS1

DS2

K5 Pro

Customer Reviews
4.6 out of 5 stars 56
4.2 out of 5 stars 3,142
4.4 out of 5 stars 437
4.4 out of 5 stars 322
4.2 out of 5 stars 463
4.3 out of 5 stars 367
4.0 out of 5 stars 1,466
Type
i5 Open-Back Headphones DAC+Headphone Amp Headphone Amplifier/Preamp DAC+Headphone Amplifier/Preamp DAC+Headphone Amp DAC+Headphone Amp DAC+Headphone Amp
MAX Power Output/Specification
Open-ended Active speakers or Amplifiers 2400³¾°Â°ª32¦¸(±á¾±²µ³ó 3.5mm: 280mW, 4.4mm: 1100mW 120mW@32 Ohm(SE) 120mW@32 Ohm(SE) Active speakers or Amplifiers
Input
x PC-USB + Optical + Coaxial 3.5mm line in USB + Optical Type C+ USB A Type C+ USB A USB-C + Optical + Coaxial
Output
1.5M&3.5mm3.5mmHeadphone RCA + 3.5mm Headphone 3.5mm/6.35mm headphone jack Headphone Jack, 3.5mm AUX/OPT" 3.5mm 4.4mm Headphone 3.5mm 4.4mm Headphone RCA + 3.5mm Headphone
Treble & Bass Control
x ? ? x x x ?
Earphone diaphragm size
97MM x x x x x x
THD
x ¡Ü0.01% <0.001% ¡Ü0.001% ¡Ü 0.0006%(SE) ¡Ü 0.001%(BAL) <0.0001% <0.003%
SNR
98dB ¡Ý105»åµþ ¡Ý108»åµþ ¡Ý120»åµþ ¡Ý120»åµþ ¡Ý130»åµþ >110dB
Terminating Impedance
x 16-200 Ohm 16-300 Ohm 16-300 Ohm 16-300 Ohm 16-300 Ohm 16-300 Ohm
PC-USB Input Sampling Rate
x 24bit/96kHz - 32bit/384kHz 32bit/768kHz 32bit/768kHz 24bit/96kHz
Diaphragm thickness
2umPET x x x x x x
Earphone Case Material
Leather + Canvas + Sponge x x x x x x

Product details

  • Parcel Dimensions ‏ : ‎ 17.5 x 12.9 x 5.99 cm; 281 g
  • Manufacturer ‏ : ‎ FOSI AUDIO
  • ASIN ‏ : ‎ B0FXLVLV1M
  • Item model number ‏ : ‎ IM4-S
  • Country/Region of origin ‏ : ‎ China
  • Customer Reviews:
    4.3 out of 5 stars (22)

Product information

Technical Details

Headphones jack ‎3.5 mm Jack
Model name ‎IM4
Connectivity technology ‎Wired
Included components ‎User Manual
Age range (description) ‎Adult
Material ‎Aluminum
Specific uses for product ‎Gaming, Studio, Fitness
Compatible devices ‎Desktops, Laptops, Tablets, Smartphones
Water resistance level ‎Not Water Resistant
Control method ‎Push Button
Number of Items ‎10
Manufacturer ‎FOSI AUDIO
Place of Business ‎Shenzhen Foresight Technology Co.Ltd,Dalang street,ShenZhen,Guangdong,518000,+86 17722625601
Model ‎IM4-S
Part Number ‎IM4-S
Hardware interface ‎3.5mm Audio
Special features ‎Dual Magnet & Dual Chamber, Open-Back Design, Ergonomic & Lightweight, Premium CNC Aluminum Crafts, Customizable Sound & Detachable Cable
Batteries included ‎No
Batteries Required ‎No
Material Type ‎Aluminum
Supports Bluetooth Technology ‎No
Manufacturer ‎FOSI AUDIO
Item model number ‎IM4-S
Parcel Dimensions ‎17.5 x 12.9 x 5.99 cm; 281 g
ASIN ‎B0FXLVLV1M

Additional Information

Date First Available Nov. 7 2025
Customer Reviews
4.3 out of 5 stars (22)

4.3 out of 5 stars
Â鶹Çø Rank

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Fosi Audio IM4 Open-Back HiFi IEM Earphones, 10mm Beryllium Driver, N52 Dual Magnet & Dual Chamber, 2-Pin Detachable Cable 3.5/4.4mm Balanced, Custom Tuning, Ergonomic Fit for Studio/Music/Gaming

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Product Summary: Fosi Audio IM4 Open-Back HiFi IEM Earphones, 10mm Beryllium Driver, N52 Dual Magnet & Dual Chamber, 2-Pin Detachable Cable 3.5/4.4mm Balanced, Custom Tuning, Ergonomic Fit for Studio/Music/Gaming

From Fosi Audio

4.3 out of 5 stars, 22 ratings

Customer reviews

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About this Item

  • 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.

Product description

IM4 designed exclusively for discerning audio enthusiasts, IM4 Premium In-Ear Monitors set a new standard for high-fidelity sound and refined performance. Engineered with an N52 dual magnet system for precise audio control and a dual-chamber acoustic design to ensure balanced frequency response, the 10mm beryllium driver delivers an expansive soundstage and meticulous detail reproduction¡ªcapturing every nuance of your favorite recordings with audiophile-grade clarity. To prioritize extended listening comfort, each earpiece weighs a mere 7 grams and features a hypoallergenic, smooth metal housing. This ergonomic design ensures gentle contact with the skin, eliminating fatigue even during prolonged use, while maintaining a sleek, professional aesthetic. Crafted for durability and elegance, the IEM shells are precision CNC-machined from a single block of aluminum, showcasing exceptional build quality and minimalist sophistication. The distinctive orange metal grille and branded logo add a subtle yet recognizable touch, blending functional design with timeless style. For personalized audio calibration, the set includes three eartip options (Bass, Deep Bass, Balanced) and two sound nozzles (Brass, Aluminum), allowing users to fine-tune bass and treble to their preferences. Additionally, the detachable 2-pin 0.78mm cable offers compatibility with 3.5mm and 4.4mm ports, ensuring versatility across various audio devices. IM4 Premium IEMs seamlessly integrate cutting-edge acoustics, ergonomic design, and customizable functionality¡ªmaking them a definitive choice for audio enthusiasts seeking uncompromised performance and reliability.
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