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/Gaming Black

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/Gaming Black

Brand: Fosi Audio
4.2
A$136.50
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  • 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

Open-Back In-Ear Monitor

Fosi Audio IM4

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

Shell Material 6063 CNC Aluminum Alloy
Driver Unit 10 mm N52 Dual-Magnet Dual-Cavity Dynamic Driver
Diaphragm PU Beryllium-coated Diaphragm
Sensitivity 109dB/mW
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

  1. High-Performance Dynamic Unit

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

  2. Rich Sound Details

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

  3. Hi-performance Single Driver, Pure Excellence

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

  4. Perfect Balance of Acoustic Space

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

  5. Ensure pure Signal Transmission

    4-strand 392-core 5N OFC silver-plated cable: signal transmission stable gold-plated connectors.

  1. Pocket-sized, Expansive Soundscape

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

  2. Acoustic Damping for Pure Sound

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

  3. Ergonomic Build for Comfort

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

  4. Balanced Tuning Across Genres

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

  5. Enjoy All-day Comfort

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

  1. Two Bold Finishes

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

  2. Explore More Sound Styles

    Triple-tunable ear tips in three sizes adapt to ears, allowing you to customize the bass response.

  3. Aluminum Alloy Conduit and Brass Nozzle

    Tailor your sound: an aluminum nozzle for warm bass or a brass one for clear mids and treble.

  4. 2-Pin 0.78mm Connectors

    Braided cable with a 3.5mm plug, easily upgrade to 3.5mm or 4.4mm cables for flexible customization.

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Customer Reviews
4.5 out of 5 stars 132
4.6 out of 5 stars 90
4.1 out of 5 stars 1,388
4.3 out of 5 stars 3,069
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4.6 out of 5 stars 256
Price
$299.99$299.99 $279.99$279.99 $71.99$71.99 $59.39$59.39 $84.99$84.99 $118.99$118.99 $259.99$259.99
Type
DAC/Headphone Amp/Preamp DAC+ Headphone Amp DAC+Headphone Amp DAC+Headphone Amp DAC+ Headphone Amp Headphone Amp+Equalizer Balanced Stereo DAC
MAX Power Output
4.4mm:2570mW/6.35mm:640mW@32Ω 3.5mm:1200mW/4.4mm:4200mW@32Ω 500mw@32Ω 250mw@32Ω 130mW(SE); 510mW(BAL) 3.5MM: 280mW/4.4MM: 1100mW@32Ω XLR: 5Vrms/RCA: 2.5Vrms
Input
USB-C+OPT+COAX+RCA USB-C+OPT+COA+BT+Microphone USB-C+OPT+COA+3.5mm Microphone PC-USB + Optical + Coaxial Type C USB/OPT USB+HDMI+OPT+COA+BT
Output
4.4mm/6.35mm/RCA/XLR RCA + 3.5/4.4mm Headphone RCA + 3.5mm Headphone RCA + 3.5mm Headphone 3.5mm + 4.4mm Headphone 3.5mm/4.4mm HP+3.5mm AUX/OPT XLR + RCA
Treble & Bass Control
✔ ✘ ✔ ✔ ✘ ✘ ✘
THD
≤ 0.00018% ≤ 0.0002% <0.003% ≤0.01% ≤ 0.0002%(SE) ≤ 0.001%(BAL) ≤ 0.001% <0.00008%
SNR
≥ 121dB 126dB >110dB >105dB ≥130dB 3.5mm: 120dB/4.4mm: 115dB 126dB
Terminating Impedance
16-300 Ohms 16-300 Ohms 16-300 Ohms 16-200 Ohms 16-300 Ohms 16-300 Ohms No Headphone Output
Work Voltage
DC 12V DC 12V DC 5V DC 5V DC 5V DC 5V DC 12V
  • Item Model Number: IM4-B
  • Part Number: IM4-B
  • Specific uses for product: Gaming, Music, Fitness
  • Number of items: 1
  • Country/Region of origin: China
  • Batteries Included: No
  • Batteries Required: No
  • Material: Aluminium
  • Material Type: Aluminium
  • Compatible devices: Desktops, Laptops, Tablets, Telephones, Cellphones, Music Production Equipment, Car Audio Systems, Smart Speaker, Television
  • Supports Bluetooth Technology: No
  • Item Weight: 300 g
  • Connectivity technology: Wired
  • Model: IM4-B
  • Model name: IM4
  • Included components: User Manual
  • Special Features: Hi-Fi Sound, Open-Back Design, Custom Tuning, Detachable Balanced Cable
  • Hardware Interface: 3.5mm Audio
  • Package Dimensions: 17.5 x 12.8 x 5.7 cm; 300 Grams
  • Manufacturer: Fosi Audio
A$136.50
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Availability:
  • In Stock
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