Transmitter→
Both headphones
Use the included transmitter. Both headphones are pre-paired.
Pre-pairedIndependent volume
Step 1 of 4 · Cable
Connect your TV
Find an audio OUT port on your TV. Choose one cable below.
Not sure? Take a photo of your TV ports.
Contact Support →Connect the Optical cable
- Remove the clear protective caps from both cable ends.
- TV: plug into OPTICAL / DIGITAL AUDIO OUT.
- Transmitter: plug into Input from TV — OPT.
Both plugs are fully inserted. Use only one TV audio cable.
Next: power on the devices →
Connect the 3.5 mm AUX cable
- TV: plug into HEADPHONES / AUDIO OUT.
- Transmitter: plug into Input from TV — AUX. Push both blue-ended plugs in completely.
Both plugs are fully inserted. Use only one TV audio cable.
Next: power on the devices →
Step 2 of 4 · Power
Power on the transmitter and both headphones
- Connect USB-C to the transmitter and USB-A to a powered TV USB port or 5 V, 1–2.4 A adapter. Slide the transmitter switch to ON.
- Slide both headphone switches from OFF to ON. Keep them near the powered transmitter for 5–10 seconds.
- Check that both headphone LEDs are solid blue.
Both connected? Set the TV audio next →
Blue lights confirm connection, not TV sound.
First use or headphones will not turn on?
The charging docks need their own USB-C power. They charge the headphones; they do not send TV audio.
If a headphone will not turn on, follow the charging steps, then return here once it turns on.
No light?
One headphone does not connect?
Keep the headphone away from other Bluetooth devices. Press its matching transmitter button once, then wait 5–10 seconds: black button 1 for the black headphone; red button 2 for the red headphone.
After charging: if a headphone stays off, slide its switch OFF, then ON.
Still only one connects? →Step 3 of 4 · TV sound
Set TV audio
Use your TV remote.
Select Optical or AUX in Step 1 to see the matching TV settings.
- Open Settings → Sound / Audio
-
Choose how you want to listen
-
Headphones only:
Set Sound Output to Optical / External Speaker / Audio System. -
TV speakers + headphones:
See how to play through both →
-
Headphones only:
-
Set Digital Audio Format to
✓PCM or Stereo
See how to set PCM
Why PCM? PCM is an audio format the transmitter supports.
Choose your TV brand:
×Avoid Dolby, DTS, Auto or Bitstream.These may cause silence.
Open Settings → Sound
Set TV volume to a normal level (about 50% to start). No PCM setting is needed for AUX.
Check: play a TV program with speaking voices. The transmitter Audio Signal light should be solid.
Audio Signal light still blinking?
Step 4 of 4 · Listen
Listen to your TV
After completing the TV sound settings:
- Play a TV program with speaking voices.
- Put on the black and red headphones. Adjust each headphone’s volume separately.
- Check that both people hear TV sound.
Success: both headphone LEDs are solid blue and both people hear TV sound.
Setup complete. Both people hear TV sound and can adjust volume separately.
TV Bluetooth setup
Pair one headphone directly.
One headphone only. No dual standby or two-headphone connection.
- Turn the transmitter OFF.
- Hold one headphone switch at PAIR for 3 seconds.Wait for the headphone LED to flash red and blue.
- Select Avantree AS19 in the TV Bluetooth audio list.
- Play TV sound and adjust headphone volume.Solid blue means connected.
Need both headphones?
Setup complete for one headphone. For two listeners, use the transmitter kit.
Quick fixes
Choose what is wrong.
Follow the short check, then confirm the expected result.
1Sound only on one side of a headphone
Possible cause: the source balance is off-center, or one earcup has a hardware fault.
- Test the other included headphone on the same TV program.
- On the affected headphone, confirm left/right balance is centered on the TV, phone, or PC.
- Turn the headphone off and on, then test another source.
Expected: speech plays from both earcups. If one earcup stays silent on every source, submit a ticket for hardware service.
2Only one headphone connects
Possible cause: direct TV Bluetooth supports one headphone, or a headphone reconnected to a phone or PC.
- Use the transmitter setup, not TV Bluetooth.
- Turn off Bluetooth on nearby phones/PCs so a headphone cannot reconnect there.
- Turn both headphones OFF, then ON.
- Press the matching black or red button on the transmitter once and wait 5–10 seconds.
Expected: both headphone LEDs turn solid blue. Direct TV Bluetooth supports only one included headphone at a time.
🔇No sound after setup
Possible cause: the cable uses an input instead of audio OUT, the TV output format is wrong, or volume is low.
- Confirm the cable uses TV audio OUT and transmitter Input from TV.
- For Optical, select Optical output and PCM.
- Check the transmitter Audio Signal LED: solid means valid audio; blinking means fix the TV output/settings.
- Raise each headphone's volume.
Expected: the Audio Signal LED is solid and speech plays from both headphones. Open the official no-sound guide →
⌁Hum, buzz, or crackling
Possible cause: a loose AUX plug or interference from USB power and nearby cables.
- Push the AUX plugs fully into both ports.
- Move the audio cable away from USB power adapters and other power cables.
- Try Optical if available; it avoids analog ground noise.
- Try a different 5 V USB power source.
Expected: clean audio without hum. If only one headphone hums on every source, submit a ticket.
⚡Transmitter will not turn on
Possible cause: the USB port has no power or a USB-C cable end is loose.
- Reconnect USB-C at the transmitter and the USB power source.
- Use a 5 V, 1–2.4 A source.
- Try another cable or powered USB port, then slide OFF → ON.
Expected: the transmitter lights turn on or blink. If no LED appears, submit a ticket with a photo of both cable ends.
Charging
Watch, dock, check the light.
Each dock needs USB-C power.
- Power the dock: connect USB-C to a powered TV USB port or 5 V, 1–2.4 A adapter.
- Dock the headphone: align the two lightning marks.
- Check the light: reposition the headphone if no charging light appears.
Charging: white LED blinks.
Full: LED turns off after about 2 hours.
USB-C charging or headphone stays off?
Charge without the dock: connect USB-C directly to the headphone.
After docking: if the headphone stays off, slide its switch OFF, then ON.
Phone / tablet / PC Bluetooth
Pair one headphone directly.
Choose one headphone by Bluetooth, or both headphones through the transmitter.
- Turn the transmitter OFF.
- Hold the headphone switch at PAIR for 3 seconds.
- Open Bluetooth and select Avantree AS19.
Use both headphones with a PC
- Power the HT41899 Plus 2 transmitter by USB and slide its switch to ON.
- Connect the PC HEADPHONES / AUDIO OUT to transmitter Input from TV — AUX with the included blue-ended 3.5 mm cable.
- Select the PC headphone output and play audio.
- Turn on both headphones and adjust their volume separately.
Done: both headphone LEDs are solid blue and both play PC sound.
No sound? Check the PC output, cable ends and headphone volume. USB supplies power only.