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Interactive user guide

HT41899 Plus 2 Setup Guide

TV headphone setup

Connect your TV by Optical or AUX, then listen together with separate volume.

Start SetupFix a problem
HT41899 Plus 2 transmitter, two headphones, and two charging docksTwo headphonesIndependent volume

Start setup

Choose a setup method

Both headphones are Pre-paired to the transmitter. Use the kit for two listeners and low delay.

Recommended kit setup

Set up both headphones with your TV

Step 1 of 4 · Power

Power the transmitter

Watch: power the transmitter
  1. Plug USB-C into the transmitter.
  2. Plug USB-A into a powered TV USB port or 5 V, 1–2.4 A adapter.
  3. Slide the transmitter power switch to ON.
USB-A end connects to the power source; USB-C end connects to the HT41899 Plus 2 transmitter

Power source → USB-A cable end → USB-C cable end → Transmitter

✓
Expected result: transmitter lights turn on or blink.
No light? Reconnect both cable ends and try another powered USB port or 5 V adapter.
Charging docks and USB power

Each charging dock needs its own USB-C power connection. Use a powered TV USB port or a 5 V, 1–2.4 A adapter.

USB supplies power only. Use Optical or AUX for TV sound.

See charging steps →

Step 2 of 4 · Cable

Connect your TV

Check the labels beside the ports, then choose the first match below.

TV HDMI ARC portOnly HDMI ARC / eARC?Use the HAX06 adapter. Sold separately.View HAX06
Not sure? Take a photo of your TV ports.Contact Support →

Connect the Optical cable

  1. Remove the clear protective caps from both cable ends.
  2. TV: plug into OPTICAL / DIGITAL AUDIO OUT.
  3. HT41899 Plus 2 transmitter: plug into Input from TV — OPT.
Watch: Optical connection
Ready: both plugs are fully inserted. Use only one TV audio cable.
Set TV sound →

Connect the AUX cable

  1. TV: plug into HEADPHONES / AUDIO OUT.
  2. HT41899 Plus 2 transmitter: plug into Input from TV — AUX.
  3. Push both blue-ended plugs in completely.
Watch: AUX connection
Ready: both plugs are fully inserted. Use only one TV audio cable.
Set TV sound →

Step 3 of 4 · TV sound

Set TV sound

Use your TV remote.

Choose your cable in Step 2 to see the matching TV settings.

Step 4 of 4 · Listen

Turn on both headphones

The black and red headphones are already paired to their matching transmitter buttons.

  1. Slide both headphone switches from OFF to ON.
  2. Keep both near the powered transmitter for 5–10 seconds.
  3. Play the TV and adjust each headphone's volume separately.
✓
Success: both headphone LEDs are solid blue and both people hear TV sound.

One does not connect? Press its matching transmitter button once: black button 1 or red button 2. Wait 5–10 seconds.

Black transmitter button 1 for the matching HT41899 Plus 2 headphone
Black button 1
Red transmitter button 2 for the matching HT41899 Plus 2 headphone
Red button 2

After charging: if a headphone stays off, slide its switch OFF, then ON.

Only one worksNo TV sound

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.

  1. Test the other included headphone on the same TV program.
  2. On the affected headphone, confirm left/right balance is centered on the TV, phone, or PC.
  3. 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.

  1. Use the transmitter setup, not TV Bluetooth.
  2. Turn off Bluetooth on nearby phones/PCs so a headphone cannot reconnect there.
  3. Turn both headphones OFF, then ON.
  4. 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.

  1. Confirm the cable uses TV audio OUT and transmitter Input from TV.
  2. For Optical, select Optical output and PCM.
  3. Check the transmitter Audio Signal LED: solid means valid audio; blinking means fix the TV output/settings.
  4. 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.

  1. Push the AUX plugs fully into both ports.
  2. Move the audio cable away from USB power adapters and other power cables.
  3. Try Optical if available; it avoids analog ground noise.
  4. 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.

  1. Reconnect USB-C at the transmitter and the USB power source.
  2. Use a 5 V, 1–2.4 A source.
  3. 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.

Watch: charge on the dock
⚡
  1. Power the dock: connect USB-C to a powered TV USB port or 5 V, 1–2.4 A adapter.
  2. Dock the headphone: align the two lightning marks.
  3. 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.

Watch: pair with a phone or PC
  1. Turn the transmitter OFF.
  2. Hold the headphone switch at PAIR for 3 seconds.
  3. Open Bluetooth and select Avantree AS19.
✓
Connected: the headphone LED is solid blue.
Use both headphones with a PC
  1. Power the HT41899 Plus 2 transmitter by USB and slide its switch to ON.
  2. Connect the PC HEADPHONES / AUDIO OUT to transmitter Input from TV — AUX with the included blue-ended 3.5 mm cable.
  3. Select the PC headphone output and play audio.
  4. 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.

Reference

Buttons, lights, and official help.

HT41899 Plus 2 headphone buttons and indicators diagram
Black and red headphones — volume, multifunction button, power/pair switch, charging and status LEDs.
HT41899 Plus 2 transmitter buttons, inputs, and indicators diagram
Transmitter — black button 1 and red button 2, Audio Signal light, Optical and AUX inputs.
MFB press
Play/pause or reconnect; during a call, mute/unmute
Headphone solid blue
Connected
Headphone blinking blue
Not connected
Red + blue
Bluetooth pairing
Audio Signal solid
Valid TV audio
Audio Signal blinking
Invalid/no TV audio
Playtime
Up to 50 hours (current product specification)