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Interactive user guide

HT4186-Q Setup Guide

TV earbud setup

Connect by Optical, AUX or RCA, then listen through the included wireless neckband earbuds.

Use the included transmitter. Your NB16-Q earbuds are pre-paired.

Start SetupFix a problem

Requires Bluetooth headphone support.

HT4186-Q neckband earbuds and transmitterPre-pairedUp to 20 hours

Recommended kit setup

Set up with the transmitter

  1. 1Cable
  2. 2Power
  3. 3TV sound
  4. 4Listen

Step 1 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 HAX06 Converter
TV has red / white AUDIO OUT?

Use an RCA-to-3.5 mm adapter cable (not included).

Not sure? Take a photo of your TV ports.

Contact Support →

Connect RCA audio OUT

Requires: an RCA-to-3.5 mm adapter cable, not included.
Red / white AV IN sockets will not work.

  1. TV: connect red and white RCA plugs to the matching AUDIO OUT sockets.
  2. Transmitter: connect the 3.5 mm end to AUX.
✓
Ready

The TV audio OUT connects to the transmitter AUX input.
No AUDIO OUT label? Choose another connection.
Next: power on the devices →

Connect the Optical cable

  1. Remove the clear protective caps from both cable ends.
  2. TV: plug into OPTICAL / DIGITAL AUDIO OUT.
  3. Transmitter: plug into the OPTICAL / OPT input.
    Match the plug shape and insert gently.
✓
Ready

Both square plugs are fully inserted.
Do not force the cable into the port.
Next: power on the devices →

Connect the AUX cable

  1. TV: plug into HEADPHONES / AUDIO OUT, not AV IN.
  2. Transmitter: plug into AUX.
✓
Ready

Both round plugs are fully inserted.
The TV may mute its speakers when you use its headphone jack.
Next: power on the devices →

Step 2 of 4 · Power

Power on the transmitter and earbuds

  1. Transmitter: connect USB-C power, then switch ON.
    Use TV USB or a 5 V USB adapter.
  2. Earbuds: if OFF, hold the multi-function button (MFB) for 3 seconds.
  3. Connect: keep them close and wait 3–5 seconds.
✓
Connected: both connection lights are solid blue.

Next: set the TV sound in Step 3 →
Otherwise, no sound.

No light or not connected?

No transmitter light: reseat both USB cable ends and try another USB power source. More power help →

No earbud light: charge the earbuds, then unplug the charging cable before use.

Both on, but not connected: re-pair the earbuds and transmitter →

USB power: USB-C connects to the transmitter; USB-A connects to TV USB or a 5 V / 500 mA–2 A adapter. Keep USB power connected during use.

Connection check: the earbud LED and transmitter listener 1 indicator should both be solid blue. If the earbuds are already ON, leave them on.

Step 3 of 4 · TV sound

TV sound settings

Use your TV remote.

Choose your cable in Step 1 to see the matching TV settings.

Open
Settings → Sound / Audio
Choose how you want to listen

TV menus vary. See the guide below.

Set Digital Audio Format to
PCM or Stereo
Avoid Dolby, DTS, Auto or Bitstream.

These may cause silence.

AUX 3.5 mm

Set the TV audio output

Open
Settings → Sound / Audio
Set Sound Output
Headphones or Audio Out
TV output volume
Raise gradually, if adjustable.

Using RCA? Check your TV manual for the audio OUT setting.

See how to set PCM

Why PCM? PCM is an audio format the transmitter supports.

Choose your TV brand:

Samsung LG Sony TCL Roku Hisense VIZIO Philips Panasonic Sharp Insignia Other TV brand

Next: listen to your TV →

TV speakers + earbuds?See if your TV supports both →

Step 4 of 4 · Listen

Listen to your TV

After completing the TV sound settings:

  1. Play TV audio. Choose a program with speaking voices.Check: the transmitter input light is solid white.
    No white light? Check settings and cable →
  2. Put on the earbuds. Press + / − on the earbuds to adjust volume.
  3. Check the sound. Confirm you hear TV speech through the earbuds.
✓
Success: solid blue connection lights + TV sound through the earbuds.
No soundCannot connect

Next time: reconnect to your TV

turn the transmitter ON. If the earbuds are OFF, hold their MFB for 3 seconds.
If automatic reconnection fails, press the earbud MFB once or transmitter listener 1 once.
Re-pair if needed.

DIRECT TV BLUETOOTH

Pair directly with your TV

Requires a TV that supports Bluetooth headphone audio.
This route may have more sound delay than using the included transmitter.

  1. Turn the transmitter OFF. Turn off Bluetooth on nearby phones previously paired with the earbuds.
  2. Put the earbuds in pairing mode. Start with the earbuds OFF.
    Hold the multi-function button (MFB) for about 5 seconds, past power-on, until red / blue alternate and you hear “Pairing.”
  3. Open your TV’s Bluetooth audio list. Look in the TV Sound settings.
  4. Select the earbuds. Choose Avantree NB16T-Q or NB16T, as displayed.
    Confirm the TV’s connection prompt.
  5. Play TV audio. Press earbud + / − to adjust volume.
Where is the Bluetooth list on Samsung TVs?

On supported Samsung TVs: Home → Settings → Sound → Sound Output → Bluetooth Speaker List.

Done: the earbud LED is solid blue and you hear TV sound.

If not: verify the TV supports Bluetooth audio, return the earbuds to red / blue pairing mode and retry.
If your TV has no Bluetooth audio list, use the transmitter setup →

No sound

Reconnect next time

Turn on the earbuds.
If needed, press MFB once or select the saved earbuds in your TV Bluetooth list.
Re-pair if you used another device.

Fix a problem

Connected, but no TV sound

Possible cause: HT4186-Q is connected wirelessly, but the TV output, audio format, cable or volume is wrong.

For transmitter setup, a solid white input indicator confirms a valid TV audio signal.
Solid blue confirms Bluetooth only.

  1. For transmitter setup, check both ends of the TV cable and use AUDIO OUT.
    For direct Bluetooth, keep the transmitter OFF and select the earbuds as the TV sound output.
  2. For Optical, set TV output to Optical and format to PCM / Stereo.
    Check PCM on a connected streaming box too.
  3. Play speech and raise the earbud volume with +.
    For AUX, raise TV output volume if available.
  4. If the earbud LED is not solid blue:
    Using the transmitter? Re-pair the kit →
    Using TV Bluetooth? Repeat direct TV pairing →

Expected: the earbud LED stays solid blue and TV speech plays through the earbuds.

Still silent? Contact Support with the cable type and both LED states.

Earbuds will not connect or reconnect

Possible cause: the earbuds have connected to another device, or pairing / locking needs to be restored.

For this recovery, keep the transmitter powered while the TV is OFF.
If it uses TV USB, move it to a USB wall adapter first.
Then turn the TV OFF and nearby phone Bluetooth off.

  1. Turn transmitter ON.
    Hold its listener 1 button for about 5 seconds until the nearby indicator alternates red and blue.
  2. Turn the earbuds OFF.
    Hold its MFB for about 5 seconds, continuing past power-on until red / blue alternate and you hear “Pairing.”
  3. Keep the earbuds close to transmitter and wait for solid blue on both devices.
  4. Only after connection, hold transmitter 1 and 2 together for about 10 seconds until the indicator turns pink for a few seconds.
    Release to lock this connection.
  5. Turn both devices OFF, wait about 5 seconds, then turn the transmitter and earbuds ON.
    Wait 5–10 seconds.

Expected: both devices reconnect with solid blue lights.
Turn the TV back ON, restore normal transmitter power and confirm TV sound.

If not: reset both devices, then repeat pairing and locking.
Full HT4186-Q re-pair and lock guide.

Using soundbar together? More quick fixes

Charge the earbuds

Power
5 V USB charger
1 A or 2 A
Connect
Connect the supplied USB-C cable to the earbuds.
Charging
Solid red
Fully charged
Light off

Unplug before listening.

No charging light?

Reconnect the cable.
Try another 5 V USB source and USB-C cable.

Expected: solid red appears.
Still no light? Contact Support.

Charging tips & power FAQ

Allow about 2–2.5 hours to fully charge. Up to 20 hours of use; actual time varies with volume and use.

Only the earbuds have a rechargeable battery.
The transmitter needs continuous USB power.

Power and charging FAQ →

Use with a phone or computer

  1. Start with both devices off

    Turn the transmitter OFF and earbuds OFF.

  2. Hold the multi-function button

    On the earbuds, hold the MFB for about 5 seconds.
    Wait for Red / blue alternating and the “Pairing” prompt.

  3. Select the earbuds in Bluetooth settings

    On your phone or computer, choose Avantree NB16T-Q or NB16T, as displayed.

  4. Play audio

    Adjust the volume on the earbuds.

Ready whenSolid blue and audio plays through the earbuds.

Cannot connect?

Disconnect other paired devices, then repeat the steps above with your Bluetooth audio phone or computer.

Return to TV listening
  1. Turn phone Bluetooth off.
  2. Turn the transmitter ON. If the earbuds are OFF, hold their MFB for 3 seconds.
    If already ON, leave them on.

Connected: both connection LEDs are solid blue.
Play TV audio and adjust volume in Step 4 →
Not connected? Re-pair the kit →

Add a second pair of headphones

Before pairing: turn the TV and nearby phone Bluetooth OFF. Keep the transmitter USB-powered; use a wall adapter if TV USB turns off.

  1. Connect the included earbuds first

    Turn on the transmitter and the earbuds. Wait for Listener 1: solid blue; leave both on.

  2. Pair the second headphones

    Put them in pairing mode using their instructions.

  3. Hold transmitter listener 2 for 5 seconds

    Red / blue alternating means pairing. Keep them close until 1 + 2: solid blue.

  4. Turn on the TV and listen

    Play TV audio. Adjust volume on each pair.

Ready whenBoth pairs play TV sound.

Second pair will not connect?

Keep the included earbuds connected, turn nearby phone Bluetooth off and repeat pairing for the second headphones.

Some true wireless earbud combinations are less reliable.
Test each pair alone.

Full second-listener guide →

Next time / use only the second pair

Next time: connect the included earbuds first.
Turn on the second headphones and wait 5–10 seconds.
If they do not reconnect, press transmitter 2 once.

Second pair only: connect the original pair, connect the second, then turn the original pair OFF.

HT4186-Q supports up to two Bluetooth listening devices.
One pair of earbuds is included; a second pair is sold separately.