Uploaded July 2026 | Updated September 2026, 2 weeks ago

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Looking for IEM ba? Check out this new IEM from Fosi Audio and the unique Magnetic DAC for iPhones and Android devices that can enhance your listening habit.

VISIT HERE:
fosiaudio.com

-- Fosi Audio IM4 IEM --
Shell Material: 6063 CNC Aluminum Alloy
Driver Unit: 100 mm N52 Dual-Magnet Dual Cavity Dynamic Driver
Diaphragm: PU Beryllium-coated Diaphragm
Sensitivity: 109dB/mW
Impedance: 21ohm
Frequency Response: 20Hz-20kHz
Cable: 4-core 392-strand 5N OFC Silver-plated Copper Cable
Connector: 2-PIN 0.78mm
Audio Jack: 3.5mm Gold-plated Plug
Weight: 7g per earbud
Weight (incl. cable): 38g

-- FOSI AUDIO MD3 MAGDAC --
CHIPSET
DAC: ESS Sabre ES9039Q2M
Amplifier Chips: ESS ES9603Q x4

INPUT
USB-C: (top)
Audio Decoding
Image Transfer
Charging
USB-C (bottom)
Audio Decoding
Image Transfer
Firmware Upgrade

OUTPUT:
3.5mm Single-ended, 4.4mm Balanced

USB AUDIO CLASS
UAC 2.0, UAC 1.0

MAX SAMPLING RATE
UAC 2.0
PCM 32bit/384kHz
DSD256 (native)
UAC 1.0
PCM 16bit/48kHz

MAX OUTPUT POWER
3.5mm: 75mWx2 @32ohm
4.4mm: 180mWx2 @32ohm

FREQUENCY RESPONSE
20Hz-48kHz (0.2dB)

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