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Small black box with HDMI ports and power input

Boxwave

Boxwave BK-929 eARC 8K Audio Extractor 4K 120Hz 18G HDMI 2.0

SKU CH-FT0Y-6XYZ8

Extracts eARC audio from an HDMI source to a soundbar while passing 4K at 120 Hz video to a monitor

  • TypeAdapters
  • Extract Dolby Atmos from eARC sources to a soundbar
  • Pass 4K 120Hz video while sending audio to an AV receiver
  • Support LPCM 7.1, Dolby TrueHD and DTS-HD Master Audio
  • Control soundbar volume with the TV remote via CEC
  • HDCP 2.2 compliant for protected 4K and 8K content

What this extractor does

The Boxwave BK-929 eARC audio extractor takes an HDMI source signal and splits off the audio for a soundbar or AV receiver while passing 4K or HDR video to the display. It is built for gamers and PC users whose monitors lack native ARC or eARC ports but who want full-format audio from consoles or graphics cards.

Build and daily connections

A compact adapter housing carries one HDMI input, one HDMI output and an HDMI audio output, all supporting 18 Gbps bandwidth and HDCP 2.2 compliance. The unit draws power from an included 100-240 V supply and uses CEC so the TV remote can adjust soundbar volume and power devices on or off together.

The spec that decides fit

It handles 4K at 120 Hz and 2K at 60 Hz while passing LPCM 7.1 CH, Dolby TrueHD Atmos and DTS-HD Master DTS:X through the HDMI audio port. Buyers needing HDMI 2.1 passthrough bandwidth beyond 18 Gbps or analogue audio outputs will not be served by this device.

Highlights

  • Extract Dolby Atmos from eARC sources to a soundbar
  • Pass 4K 120Hz video while sending audio to an AV receiver
  • Support LPCM 7.1, Dolby TrueHD and DTS-HD Master Audio
  • Control soundbar volume with the TV remote via CEC
  • HDCP 2.2 compliant for protected 4K and 8K content

Specifications

TypeAdapters

Questions about this item

Does the 18G HDMI 2.0 link carry full 8K eARC bandwidth or is it limited to 4K 120Hz video pass-through?

The unit passes 4K at 120Hz and 2K at 60Hz video while extracting eARC audio; the HDMI 2.0 path is rated at 18G and does not transport native 8K video.

What physical connections and power does the BK-929 need to sit between a monitor and a soundbar?

It requires one HDMI input from the source, one HDMI output to the display, an HDMI eARC output to the soundbar, and the included 100-240V power adapter.

What is the correct hookup order so the extractor negotiates eARC and CEC with a Sonos or similar bar?

Connect source to the extractor input, display to the pass-through output, soundbar to the eARC output, apply power, then enable CEC on the TV so the remote controls soundbar volume.

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