Fosi Audio IM4-B Open‑Back Wired Earbuds – All‑Day Comfort for Work, Commute, or Home
Key Features
Product 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.
IM4 Wired Earbuds
Wired Is Cool Again
No charging nonsense.
Just Plug and Play.
open-back design.
clearly immersive.
Minimizes internal reflections and pressure buildup,
delivering a more open, natural sound with reduced fatigue.
find the sound
that fits you
Choose from 3 ear tip sizes, 3 ear tip styles, and 2 sound nozzles: aluminum for reduced sibilance and added bass, or brass for clearer mids and treble.
tuned for
long listening
Carefully tuned for balanced sound with clear vocals, smooth highs, and fatigue-free listening.
ergonomic fit for your ears
Designed from millions of ear shape data, the ergonomic housing ensures a secure fit and all-day comfort.
7g lightweight design
The hollowed structure cuts weight to
ensure pressure-free comfort.
skin-friendly finish
The all-aluminum body offers a smooth touch
that's gentle on the skin.
Specifications
|
Specification |
Details |
|---|---|
|
Brand |
Fosi Audio |
|
Model |
IM4-B |
|
Product Type |
Open-Back Wired Earbuds / In-Ear Monitors |
|
Driver Type |
Dynamic Driver |
|
Driver Size |
10 mm |
|
Driver Configuration |
N52 Dual-Magnet, Dual-Cavity |
|
Diaphragm Material |
PU Beryllium-Coated |
|
Frequency Response |
20 Hz – 20 kHz |
|
Sensitivity |
109 dB |
|
Impedance |
21 Ω |
|
Acoustic Design |
Open-Back |
|
Connectivity |
Wired |
|
Cable Type |
Detachable, 4-Core Silver-Plated Copper Cable |
|
Cable Construction |
392-Strand 5N OFC Copper |
|
Earphone Connector |
0.78 mm 2-Pin |
|
Audio Connector |
3.5 mm Gold-Plated Plug |
|
Housing Material |
6063 CNC Aluminum Alloy |
|
Weight per Earbud |
7 g ± 0.5 g |
|
Total Weight with Cable |
38 g ± 1 g |
|
Microphone |
Not specified for the standard cable |
|
Colour |
Obsidian Black |
|
Replaceable Ear Tips |
Balanced, Bass and Deep Bass |
|
Replaceable Sound Nozzles |
Brass and Aluminum Alloy |