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Small rectangular DAC amp with 3.5 mm and 4.4 mm jacks, volume buttons and a multifunction button, matte finish

BFKK

BFKK M18i Bluetooth 5.4 Portable USB DAC Amplifier

SKU CH-W8WA-H7XF4

Portable USB DAC and headphone amplifier with Bluetooth 5.4, dual 3.5 mm and 4.4 mm outputs, 60 volume steps and ES9219Q chip

  • ESS ES9219Q DAC chip drives headphones with precision
  • Patented quad-core SiP modules achieve 0.0002% distortion
  • Bluetooth 5.4 with LDAC and aptX Adaptive for lossless wireless
  • Dual 3.5 mm and 4.4 mm outputs with 60-step volume
  • USB DAC supports PCM 384 kHz and DSD256 playback

Portable Bluetooth 5.4 DAC Amplifier

The BFKK M18i is a pocket-sized USB DAC and headphone amplifier built around an ESS ES9219Q chip and dual Questyle Current Mode Amplifier SiP modules. It targets listeners who want high-resolution playback from smartphones, laptops or PCs without relying on built-in audio circuits. Balanced 4.4 mm and unbalanced 3.5 mm outputs serve a wide range of headphones.

Upgrade from basic onboard audio

The unit replaces a computer or phone’s standard headphone jack, adding hardware decoding for PCM 384 kHz and DSD256 plus Qualcomm Snapdragon Sound with aptX Adaptive, aptX HD and 24-bit 96 kHz LDAC. The jump is worth it when source material exceeds 16-bit 44.1 kHz or when balanced drive lowers noise with sensitive in-ear monitors.

Headroom for high-res files and balanced loads

Dual SiP modules deliver 0.0002 % distortion while driving demanding loads through the 4.4 mm port. Sixty volume steps give fine control for both low- and high-impedance headphones. Battery-powered Bluetooth 5.4 mode handles 24-bit 48 kHz and 96 kHz streams; USB DAC mode extends to 384 kHz PCM and DSD256. Very high-impedance planar models may need more voltage than the portable supply can provide.

Highlights

  • ESS ES9219Q DAC chip drives headphones with precision
  • Patented quad-core SiP modules achieve 0.0002% distortion
  • Bluetooth 5.4 with LDAC and aptX Adaptive for lossless wireless
  • Dual 3.5 mm and 4.4 mm outputs with 60-step volume
  • USB DAC supports PCM 384 kHz and DSD256 playback

Specifications

No published specifications for this item yet.

Questions about this item

What headphone plugs fit the 3.5 mm and 4.4 mm outputs?

The 3.5 mm jack accepts standard unbalanced headphones; the 4.4 mm jack accepts balanced-terminated headphones. Both are front-panel sockets.

How do I switch between Bluetooth 5.4 and USB DAC modes?

The unit switches seamlessly — select the M18i as the audio output on your phone for Bluetooth, or connect the USB-C cable to a PC and choose it as the USB audio device.

When should I recharge the internal battery?

Recharge via the USB-C port when the battery indicator shows low; the amplifier draws power while connected, so you can keep listening during charging.

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