The GaN supply has a power output of 240W. Offers overload and over-temperature protection. The 48V 5A GaN power supply is also available on Amazon.

Fosi Audio IM4 Open‑Back In-Ear Monitor

$99.99

Select Options: IM4-Obsidian

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Fosi Audio IM4 Open‑Back In-Ear Monitor

IM4-Obsidian

$99.99

Product details

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.

Please read our FAQs page to find out more.

How to: Choose the right banana plug?

Closed Screw Type. All Fosi amplifiers use standard-sized speaker terminals (4mm pins).
Easy to wire up and solidly connect to amplifier and passive speaker.
If they do not fit, use a little force to tighten the plugs.
Fosi Audio Banana Plugs (Copper, Silver/Gold Plated): http://bit.ly/40Djq0U, https://bit.ly/3MkPL8t
Please watch tutorial videos: https://youtu.be/6pYhoqDlvNw / https://youtu.be/RGvBgGAwS9k

How to Diagnose Power Supply Failure?

The following situations may cause this issue
Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make noise; Case 5: Sound shuts off by itself
Possible solution
Check if the power supply is illuminated when plugged into AC by itself.

Plug power supply into a different socket.

Test the adapter with a meter.

Try a different power supply (within a range of DC input).

Test the included power supply on other electrical equipment.

Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE

What is a GaN?