Fosi Audio IM4 Open-Back In-Ear Monitor
Pre-Order IM4: Ships starting November 14
Features
- Power sound with 10mm driver
- Boost dynamics via N52 magnets
- Expand space with open-back design
- Perfect Pairing with DS3 Mini Audio DAC
Fast, Free Shipping
24 Months Warranty
30-Day Money-Back Guarantee
Lifetime Customer Support
Fosi Audio IM4 Open-Back In-Ear Monitor
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
We offer free worldwide shipping, except for certain regions such as Ukraine and Russia, where our services are currently unavailable.
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Customer Support
WhatsApp: +8613716612254
support@fosiaudio.com
Mon-Fri: 3:00 AM - 3:00 PM PST -
FAQ’s
If you have any questions, please refer here: FAQs
Review Videos
Product details
Description
- IM4 features a high-quality single dynamic driver only, but performs just as well as a multi-driver setup. Its balanced tuning allows vocals and instruments to flow together naturally, delivering a smooth, layered sound that stays true to the music.
- IM4 uses an N52 dual-magnetic circuit to deliver faster response and cleaner dynamics, while its dual-chamber design opens up the soundstage and keeps all three frequencies balanced. The result is pure, detailed audio that stays comfortable to enjoy for hours.
- Braided with 4 strands of 392-core 5N high-purity OFC silver-plated wire, the cable offers excellent signal transmission and shielding. The gold-plated connector provides a more stable connection.
- Innovative open-back chamber design effectively reduces resonance and standing waves, easing inner-ear pressure. The result is a sound that feels natural and airy, never muffled or fatiguing, even after hours of continuous listening. At the same time, instruments and vocals remain clearly layered with precise directionality, creating the sensation of sitting at a live concert, surrounded by a wide and natural soundstage.
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