NO SOUND TROUBLESHOOTING
Duet – No Sound From Headphones?
Follow these steps to restore sound on your Duet (D6129).
Before You Start: Turn on the transmitter and headphones. Play a TV channel or video.
Step 1 – Check the TV Audio Cable
- Make sure the cable is firmly connected at both ends.
- Use the correct INPUT port on the transmitter, not OUTPUT.
- Match the transmitter input to your cable:
- HDMI ARC – HDMI cable.
- OPT – Optical cable.
- AUX – 3.5 mm cable.
Step 2 – Check TV Audio Settings
Select your connection:
Using HDMI ARC
- Connect HDMI to the TV's eARC port.
- Set TV Sound Output to HDMI ARC.
- Set Audio Format to PCM / Stereo.
- Turn eARC OFF in TV settings.
Using an Optical Cable
- Connect TV Optical OUT to transmitter OPT IN.
- Set TV Sound Output to Optical / Digital Audio Out.
- Set Audio Format to PCM / Stereo.
Using AUX / 3.5 mm
- Connect TV Headphone OUT to transmitter AUX IN.
- Select Headphones / Audio Out on the TV, if needed.
- Increase the TV volume.
Step 3 – Check the Audio Signal Light
Check the transmitter while the TV is playing.
Solid White – TV audio detected.
Flashing White – No valid TV audio.
If flashing white:
- Check TV audio output and PCM / Stereo.
- Check the cable and transmitter input.
Step 4 – Check the Headphone Connection
Solid Blue – Headphones connected.
Headphones not connected? Follow the pairing guide below.
Duet Headphone Pairing Guide →Step 5 – Check the Volume
- Increase the headphone volume.
- Make sure the TV is not muted.
- Test each headphone separately.
Only Certain Apps, Channels or Cable Box Have No Sound?
- Play the affected program.
- Set the TV or streaming device's audio format to PCM / Stereo.
Still No Sound? Restart the Connection
- Turn off the transmitter and headphones.
- Reconnect the TV audio cable.
- Turn on the transmitter.
- Turn on the headphones and test again.
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