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forum threadDesertGardener | Staff posted May 12, 2026 10:05 PM
forum threadDesertGardener | Staff posted May 12, 2026 10:05 PM

Fosi Audio IM4 Open-Back In-Ear Monitor $85 + Free Shipping

$85

$100

15% off
Fosi Audio
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Fosi Audio [fosiaudio.com] has Fosi Audio IM4 Open-Back In-Ear Monitor on sale for $99.99 - $15 off when you apply discount code SD15 at checkout = $85. Shipping is free.

Also Available:Description:
  • 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
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Fosi Audio [fosiaudio.com] has Fosi Audio IM4 Open-Back In-Ear Monitor on sale for $99.99 - $15 off when you apply discount code SD15 at checkout = $85. Shipping is free.

Also Available:Description:
  • 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

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Pro
May 13, 2026 12:01 PM
10,085 Posts
Joined Nov 2011
deelseaker
Pro
May 13, 2026 12:01 PM
10,085 Posts
I like how they look wireless on the first two pictures.

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