Before You Start: No sound may be caused by mismatched headphone channels, incorrect TV audio settings, or a loose cable. Turn on the Shift transmitter and headphones, then play a TV channel or video with sound.
Step 1 – Check the Headphone Connection
Check the channel lights on the headphones and transmitter. Both should show the same solid color.
Channel Colors Don't Match? Use the headphone's CHANNEL switch to select the same color as the transmitter.
Still Not Connected? Follow the pairing guide here: Shift – Pair / Add Headphones →
Step 2 – Check the TV Audio Signal & Settings
Play TV audio and check the transmitter's AUX / OPT audio signal indicator.
Choose your TV connection type and follow the matching instructions.
Step 3 – Check Connections, Volume & Restart
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Check the cable connection:
Make sure the cable is securely connected to the TV and the correct input port on the transmitter.
Optical CableConnect to the transmitter's OPTICAL INPUT FROM TV.
AUX CableConnect to the transmitter's AUX INPUT FROM TV.
- Increase the headphone volume.
- Press the headphone Mute / Unmute button once to make sure the headphones are not muted.
- Try another TV channel or video.
- Try a NEW audio cable of the same type.
- Still no sound? Turn off the transmitter and headphones, reconnect the audio cable, then turn on the transmitter followed by the headphones. Make sure both channel indicators show the same solid color, then test again.
No Sound on Certain Apps or Cable Boxes? Play the affected program and set the TV or streaming device's audio format to PCM / Stereo.
Cable Box Audio Settings →Still No Sound?
Tell us your TV model, connection type, headphone/transmitter channel colors, and whether the AUX/OPT indicator is solid or flashing.
Contact Avantree Support →
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