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Compact black USB-C dongle with 3.5 mm and 4.4 mm headphone jacks

BFKK

BFKK FC4 Portable DAC Headphone Amplifier Black

SKU CH-1AC7-MBCCN

Portable DAC with dual ES9219 chips delivering 340mW+340mW at 32 ohms via 4.4mm and 3.5mm outputs, supporting PCM768kHz and DSD256 with MQA16X decoding for Android, iOS, Mac and Windows

  • ColorBlack
  • Dual ES9219 DAC chips and FPGA reclocking deliver professional-grade decoding up to PCM768kHz/32bit and DSD256 native
  • 340mW+340mW at 32ohm drives demanding IEMs and full-size headphones with ample headroom
  • Full MQA 16X unfolding restores studio master quality from compatible streams and files
  • Driver-free plug-and-play on Android, iOS, Mac and Windows 10+ with no battery needed
  • 4mm balanced and 3.5mm single-ended outputs cover both connection types in one dongle

Portable DAC and Headphone Amplifier

The BFKK FC4 combines dual ES9219 DAC chips with independent FPGA-based crystal oscillator reclocking. It supports PCM up to 768 kHz/32-bit and native DSD256 decoding. MQA full decoding renders files at 16X. The unit delivers 340 mW per channel into 32 ohms, driving high-sensitivity IEMs and many full-size headphones from a USB-C source. It targets listeners who want portable high-resolution playback without a dedicated player.

Compatibility check before ordering

The dongle is driver-free on Android, iOS, Mac and Windows 10 or newer. On Windows versions below 10 a driver download is required. iOS devices with a Lightning port need a separate Lightning to USB-C OTG cable. The device draws power from the host, so no charging is needed. Verify that your source has a USB-C port capable of audio output and sufficient current for the amplifier section.

Build and daily use

The black aluminium shell houses the dual-chip architecture and reclocking circuitry in a compact stick form factor. Two headphone outputs sit on the same end: a 4.4 mm balanced jack and a 3.5 mm single-ended jack. Plug-and-play operation means no software setup on supported platforms. The balanced output suits cables terminated for 4.4 mm, while the 3.5 mm jack covers standard wired earphones and headphones. Both outputs share the same amplification stage, so switching between them requires only unplugging and replugging.

Highlights

  • Dual ES9219 DAC chips and FPGA reclocking deliver professional-grade decoding up to PCM768kHz/32bit and DSD256 native
  • 340mW+340mW at 32ohm drives demanding IEMs and full-size headphones with ample headroom
  • Full MQA 16X unfolding restores studio master quality from compatible streams and files
  • Driver-free plug-and-play on Android, iOS, Mac and Windows 10+ with no battery needed
  • 4mm balanced and 3.5mm single-ended outputs cover both connection types in one dongle

Specifications

ColorBlack

Questions about this item

What cables come with the FC4 and what must I buy separately to use it with an iPhone?

The FC4 uses a USB-C connection and includes no Lightning adapter. To use it with an iOS device you must purchase a separate Lightning to USB-C OTG cable.

Which headphone output should I choose between the 4.4 mm and 3.5 mm jacks?

The 4.4 mm jack provides a balanced connection for compatible cables, while the 3.5 mm jack is for standard single-ended headphones. Both share the same 340 mW + 340 mW output at 32 ohms.

What does the 340 mW at 32 ohms figure mean for my earphones in daily use?

It means the FC4 can drive most in-ear monitors and many full-size headphones to loud volumes with low distortion, handling dynamic music passages without clipping or losing detail.

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