Fosi Audio IM4 Obsidian

The Fosi Audio IM4 in-ear monitors are designed to deliver high-fidelity sound with precision and clarity. Featuring a 10mm beryllium-coated dynamic driver and N52 dual-magnet system, they provide powerful control, detailed audio reproduction, and an expansive soundstage for an immersive listening experience.

The dual-chamber acoustic structure ensures balanced sound across bass, mids, and treble, while the open-back design reduces resonance and listening fatigue. This results in a natural, spacious presentation suitable for extended listening sessions.

Crafted from CNC-machined 6063 aluminum, the IM4 offers durability and a refined aesthetic. The lightweight ergonomic design, with each earpiece weighing just 7 grams, ensures comfort even during long periods of use.

For added versatility, the IM4 includes interchangeable ear tips and sound nozzles, allowing users to fine-tune the audio signature. The detachable 2-pin cable supports both 3.5mm and 4.4mm connections, making it compatible with a wide range of audio sources.

Features
Power Sound With 10mm Driver
Dual Magnet N52 System
Open-Back Design For Wider Soundstage
Balanced And Fatigue-Free Tuning
CNC Aluminum Housing
Lightweight 7g Per Earbud
Detachable 2-Pin Cable
Customizable Sound With Nozzles And Ear Tips

Compatibility
3.5mm Audio Devices
4.4mm Balanced Outputs

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

Dimensions & Weight
Weight: 0.038 kg

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