Duet - Fix No Sound – Avantree Support

Before You Start: No sound may mean the headphones are disconnected or the transmitter is not receiving audio from the TV. Turn on the transmitter and both headphones, then play a TV program or video with sound.

Step 1 – Check the Headphone Connection

Keep the headphones near the transmitter and check their indicator lights.

Solid Blue – Headphones connected to the transmitter.

Headphones not connecting? Duet headphones use 2.4 GHz wireless, not TV Bluetooth. If the headphones are connected, continue to Step 2. Otherwise, follow the Duet Headphones Reconnection Guide →

Step 2 – Check the Audio Signal & TV Settings

Play TV audio and check the transmitter’s Audio Signal light.

Solid White – TV audio signal detected.

Flashing White – No valid TV audio signal detected. Check the settings for your TV connection below.

Choose your TV connection and follow the matching instructions.

Optical – TV Connection

Important – Set your TV audio format to PCM / Stereo.
Why PCM? PCM allows the Duet transmitter to receive and play TV audio correctly. Dolby, DTS, Bitstream, Auto, or Pass Through may cause no sound.

Open your TV’s Settings → Sound / Audio:

Set Sound Output to Optical / Digital Audio Out.
Set Digital Audio Format to PCM / Stereo.

Find PCM Settings for Your TV →

HDMI ARC – TV Connection

Set the TV’s audio output to HDMI ARC / Receiver / External Speaker.
Set the digital audio format to PCM / Stereo.
If your TV has an eARC setting, turn eARC OFF.

AUX / 3.5 mm – TV Connection

Set your TV’s Sound Output to Headphones / Audio Out, if required.
Increase the TV volume and make sure it is not muted.

Step 3 – Check Connections & Volume

Check the cable connection: Use only one audio connection (HDMI ARC, Optical, or AUX). Make sure the cable is securely connected to both the TV and transmitter.
- Optical: Connect to the transmitter’s OPT Input from TV.
- HDMI ARC: Connect to the transmitter’s HDMI ARC INPUT.
- AUX / 3.5 mm: Connect to the transmitter’s AUX Input from TV.
Set the transmitter’s input selector to match your connection: HDMI ARC, OPT, or AUX.
Increase the volume on both headphones and make sure the TV is not muted.
Test each headphone separately to see whether the issue affects one or both.
Try a new audio cable of the same type.

No sound on certain apps or cable boxes? Play the affected program and set the TV or streaming device’s digital audio format to PCM / Stereo.

Cable Box Audio Settings →

Still No Sound?

Tell us your TV model, cable type, and transmitter/headphone LED status.

Contact Avantree Support →