Before You Start: No sound usually means the NB18T headphones are not connected to the transmitter, the TV is not sending a compatible audio signal, or a cable or volume setting needs attention. Follow these three steps to find the problem.
Step 1 – Check the Headphone Connection
Turn on the Medley Clear transmitter and NB18T headphones. Check the connection indicators on both devices.
Not Connected? Follow the pairing guide to reconnect and lock the NB18T to the transmitter.
How to Pair & Lock Headphones →Step 2 – Check the TV Audio Signal & Settings
Play TV audio and check the transmitter’s audio signal indicator.
Why PCM? For Optical connections, the transmitter needs a compatible stereo signal. Set the TV audio format to PCM / Stereo. Dolby, DTS, or Bitstream may cause no sound.
Choose your TV connection type and check the matching settings.
Step 3 – Check Connections, Volume & Restart
Check the cable connection. Make sure the cable is securely connected to the TV and the correct input port on the transmitter. Use only one audio connection: Optical or AUX.
Connect to the transmitter’s OPT IN input from the TV.
Connect to the transmitter’s AUX IN input from the TV.
- Increase the volume on the NB18T headphones. For AUX, also increase the TV volume.
- Make sure the TV is not muted. Try another channel, video, or app.
- If there is still no sound, try a new cable of the same type.
- Turn off the transmitter and headphones, then turn them back on and test again.
No Sound on Certain Apps or Cable Boxes? 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, connection type (Optical or AUX), transmitter audio signal indicator, and whether the NB18T headphones connect.
Contact Avantree Support →
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