Before You Start: No sound usually means the Duet headphones aren't connected to the transmitter or the transmitter isn't receiving TV audio. Turn on the transmitter and headphones. Play a TV channel or video with sound.
Step 1 – Check the Headphone Connection
- Turn on the Duet transmitter and both headphones.
- Keep the headphones near the transmitter and check their indicator lights.
Solid Blue – Headphones connected. Continue to Step 2.
Headphones not connecting? Follow the pairing guide below. Duet headphones connect to the transmitter using 2.4 GHz wireless, not your TV's Bluetooth menu.
Duet – Headphone Pairing Guide →Step 2 – Check the TV Audio Connection
- Make sure the TV audio cable is firmly connected at both ends.
- Connect the TV's audio OUT port to the transmitter's matching INPUT port, not OUTPUT.
- Set the transmitter's input selector to match your cable: HDMI ARC, OPT, or AUX.
Check the Transmitter's Audio Signal Light
Solid White – TV audio detected.
Flashing White – No valid TV audio detected. Check Step 3.
Step 3 – Check TV Audio Settings
Open the connection you are using:
HDMI ARC
- Connect the HDMI cable from the TV's HDMI ARC / eARC port to the transmitter's HDMI ARC INPUT.
- Set TV Sound Output to HDMI ARC / Receiver.
- Set Digital Audio Format to PCM / Stereo.
- Turn eARC OFF in the TV settings.
Optical Cable
- Connect TV Optical OUT to transmitter OPT IN.
- Set TV Sound Output to Optical / Digital Audio Out.
- Set Digital Audio Format to PCM / Stereo.
AUX / 3.5 mm
- Connect TV Headphone / Audio OUT to transmitter AUX IN.
- Select Headphones / Audio Out in TV settings, if needed.
- Increase the TV volume.
Step 4 – Check the Volume
- Increase the volume on both headphones.
- Make sure the TV program is not muted.
- Test each headphone separately.
No Sound on Certain Apps or Cable Box?
If regular TV audio works but a streaming app, channel, or cable box has no sound, play the affected program and set the TV or streaming device's audio format to PCM / Stereo.
Cable Box Audio Settings →Still No Sound? Restart
- Turn off the transmitter and both headphones.
- Reconnect the TV audio cable firmly.
- Turn on the transmitter.
- Turn on both headphones and test again.
Still No Sound?
Tell us your TV model, cable type, and transmitter/headphone LED status.
Contact Avantree Support →
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