ARC audio is intermittent?

Issue: ARC audio is intermittent when using HDMI with the 4KEX70-ARC-H2.
Product model:4KEX70-ARC-H2


  1. Change the power supply: Try using a different power supply from the receiver to the transmitter. This will help determine if the issue is related to the power supply.
  2. Test a good quality cable: Replace the existing HDMI cable with a high-quality shielded cable. A poor-quality cable can cause issues with the ARC audio signal.
  3. Set the audio format to PCM: Try setting the audio format to PCM in the audio settings of the source device (such as a TV). This will help ensure compatibility with the 4KEX70-ARC-H2.
  4. Add an additional power adapter: If available, try adding another power adapter to the transmitter or receiver. This will help ensure sufficient power is being supplied to the device.

If the issue persists, it may be necessary to contact technical support for further assistance at

Further reading: How to Connect Firestick to Your Soundbar or Surround Sound Receiver?