FOSI AUDIO IM4 In-Ear Monitors Black

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With the IM4, FOSI Audio unveils its first dynamic in-ear monitors. These feature a 10mm diameter diaphragm, dual N52 magnet arrays, and a dual acoustic cavity for balanced sound reproduction. Their 21-ohm impedance coupled with 109dB sensitivity makes the IM4 easy to drive for a high level of compatibility.

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82,50 € tax excl.
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2 Years warranty

Accessories for this product

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Fosi Audio IM4 In-Ear Monitors IEM Dynamic Ø10mm 21 Ohm 109dB 20Hz-20kHz Black

Photo of the FOSI AUDIO IM4


With the IM4, FOSI Audio unveils its first dynamic in-ear monitors. These feature a 10mm diameter diaphragm, dual N52 magnet arrays, and a dual acoustic cavity for balanced sound reproduction. Their 21-ohm impedance coupled with 109dB sensitivity makes the IM4 easy to drive for a high level of compatibility. Many components are interchangeable, allowing users to change the sound output, such as aluminum and brass nozzles and different in-ear tips. In addition, there is a detachable audiophile cable made of silver-plated 5N OFC copper conductors with 0.78mm CIEM connectors to a gold-plated 3.5mm jack termination.

Fosi Audio IM4: Audiophile design

10mm Beryllium Diaphragm

10mm Beryllium Diaphragm

This diaphragm delivers smooth midrange and deep bass. Its beryllium coating provides clear, balanced high frequencies.

N52 dual magnet system

N52 dual magnet system

The N52 dual magnet system delivers superior dynamics and crystal-clear sound.

Dual acoustic chamber design

Dual acoustic chamber design

The front acoustic chamber ensures balance between different frequencies, while the rear acoustic chamber extends the high frequencies and the level of detail in the overall sound.

Detachable silver-plated OFC cable

Detachable silver-plated OFC cable

The IM4's detachable cable is made from four silver-plated 5N OFC copper conductors for flawless signal transmission and protection.

Fosi Audio IM4: Comfortable earphones

The CNC-machined anodized aluminum shell of the IM4 is very sturdy. Moreover, weighing only 7g per earphone and offering excellent sound quality, they allow you to enjoy long listening sessions without any discomfort.

Photo of the FOSI AUDIO IM4

Technical characteristics

Specifications
Product typeIn-ear monitors
DriverDynamic
Diaphragm diameterØ10mm
Diaphragm materialPU diaphragm and beryllium coating
Impedance21 ohm
Sensitivity109dB/mW
Frequency response20Hz-20kHz
Detachable cable
Cable structure4 cores of 392 strands of silver-plated 5N OFC copper
Earphone connectors0.78mm CIEM
Cable terminaision3.5mm jack
General
Weight7g/earbuds
38g: IEM + cable
ColorBlack
Package1x Pair of Fosi Audio IM4 earphones
1x Detachable cable with 0.78mm CIEM connectors to 3.5mm jack termination
2x Pair of nozzles (1x aluminum and 1x brass)
9x Pair of ear tips
 
Data sheet
ColorBlack
Impedance (Ω)21
Efficiency / Sensitivity (dB)109
WirelessNo
Cable terminationJack 3.5mm
Headphone / Earphone connectorCIEM
Phone call featureNo
Noise reductionNo
 
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FOSI AUDIO IM4 In-Ear Monitors IEM Dynamic Ø10mm 21 Ohm 109dB 20Hz-20kHz Black
With the IM4, FOSI Audio unveils its first dynamic in-ear monitors. These feature a 10mm diameter diaphragm, dual N52 magnet arrays, and a dual...

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