Simplecom CM423V2 HDMI Audio Extractor 4K HDMI to HDMI and Optical SPDIF + 3.5mm Stereo

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HDMI is capable of transmitting both video and audio signals through a single cable. However, in cases where we need to output audio to an external speaker system that has analog or optical input, this audio extractor serves as an ideal solution.

This adapter allows the user to extract the embedded audio from an HDMI source and output it separately through an analog 3.5mm audio jack or a digital optical SPDIF connector. The video stays within the existing HDMI signal and can be sent on to the HDMI display.  

You can easily place this compact adapter behind your AV equipment, and power it through a USB cable that can draw power from either a USB charger or an available USB port on your TV, media player, or PC. It is compliant with both HDMI 1.4b and HDCP 1.4 standards.


  • Optical SPDIF and 3.5mm audio output extracted from HDMI input
  • One HDMI output for HDMI pass-through
  • Ideal solution for connecting external speaker system with analog or optical input
  • SPDIF and 3.5mm jack can output audio simultaneously for 2.0CH audio
  • HDMI 1.4b and HDCP 1.4 Compliant
  • Supports HDMI resolution up to 4K Ultra HD
  • Powered by USB, plug and play
  • Supports compressed and uncompressed audio format, such as DTS-HD, Dolby TrueHD, Dolby Digital, PCM, LPCM


  • HDMI Version: HDMI 1.4b
  • HDCP Version: HDCP 1.4
  • EDID Support: EDID 1.4
  • Input: 1x HDMI Female
  • Audio Outputs: 1x SPDIF (Optical), and 1 x 3.5mm Stereo Audio (Analog)
  • Video Output: 1x HDMI Female (HDMI pass-through)
  • HDMI Resolution Support: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p
  • Audio Format Support: DTS-HD, Dolby TrueHD, Dolby AC3, PCM, LPCM, DTS, DSD
  • Max Bandwidth: 400 MHz
  • Max Baud Rate: 10.2 Gbps
  • Input/Output TMDS signal: 0.5~1.5Volts p-p (TTL)
  • Input/Output DDC signal: 5Volts p-p (TTL)
  • Max working current: 350mA
  • Operation Temperature: -10°C ~ 50°C
  • Dimension: 75 x 55 x 25mm (LxWxH)
  • Weight: 43g


Package Contents

  • 1x HDMI Audio Extractor
  • 1x 0.5M HDMI Cable
  • 1x USB Power cable
  • 1x USB Wall Charger
  • 1x User Manual



  • Support video resolution up to 4K@60Hz (YUV 4:2:0)
  • USB-C port is for power input only
  • About 3 Audio Modes
    TV: It will detect audio setting automatically from TV EDID
     (3.5mm jack will be disabled if 5.1 audio is detected)
    2.0: Both SPDIF and 3.5mm jack will output 2CH stereo audio
    5.1: SPDIF will output 5.1 channel audio, 3.5mm jack doesn’t support 5.1 channel and it will be disabled
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Simplecom CM423V2 HDMI Audio Extractor 4K HDMI to HDMI and Optical SPDIF + 3.5mm Stereo