Avantree HT4186
USER MANUAL
Model No.: BTHT-4186-BLK
Video Guide
Prefer to watch a video tutorial? Visit avantree.com/4186/video for a step-by-step guide.
Book an Appointment
You can also book a 1-on-1 setup appointment with one of our support agents at avantree.com/book-a-call.
Box Contents
- A: NB16T Earbuds (Wireless earbuds with neckband)
- B: Audikast Plus Transmitter (A small square device with buttons and indicators)
- C: Micro USB Power Cable
- D: Micro USB Charging Cable
- E: Optical Audio Cable
- F: 3.5mm AU Cable
- G: 3.5mm AUX to RCA Adapter
- H: Spare Earbud Tips & Fins
- I: Adhesive Pad
Product Introduction (Earbuds)
Product Overview
1. Multifunctional button (MFB)
2. Volume adjustment
A. Status indicator
3. Charging port
Diagram Description: The earbuds are connected by a neckband. The left earbud has a multifunctional button (MFB), volume adjustment buttons (+/-), a status indicator LED, and a charging port. The right earbud has a similar structure.
Button Functions
| No. | Button | Functions |
|---|---|---|
| 1 | [MFB button] | Note: Press & hold for 3 seconds to power on / off. From off, press & hold for 5 seconds to enter pairing mode. |
| 2 | [volume +/-] | Tap once to increase / decrease volume. Press & hold for 1 second to skip / replay track. Press & hold both for 7 seconds to clear the pairing history. Tap both once simultaneously to activate voice assistance (only works with phones). |
LED Indicators (Earbuds)
| No. | Indicators & Voice Prompt | Function |
|---|---|---|
| Solid blue for 1 second | Power on | |
| Solid red for 2 seconds then off | Power off | |
| Alternate red & blue flashes, "PAIRING" voice indicator | Pairing | |
| A | Solid blue, "CONNECTED" voice indicator | Connected |
| Blue flashes every 5 seconds | Disconnected | |
| Solid pink for 5 seconds then solid red for 2 seconds | Pairing history cleared | |
| Red flashes every 5 seconds, "LOW BATTERY" voice indicator | Low battery | |
| Solid red | Charging | |
| LED off | Fully charged |
Product Introduction (Transmitter)
Product Overview
4. Volume control buttons
B. Audio codec indicators
Pairing button for NB16T earbuds
A. Device connection indicators
C. Audio input indicators
Pairing button for 2nd headphones
A. Device connection indicators
Power port
1. ON/OFF Switch
Diagram Description: The transmitter is a small square device. It features volume control buttons (+/-), audio codec indicators (SBC, FS, APTX, LL), pairing buttons for earbuds and a second pair of headphones, device connection indicators, audio input indicators, and a power port (DC IN, OPTICAL, AUX, ON/OFF). The ON/OFF switch is labeled '1'.
Button Functions
| No. | Button | Functions |
|---|---|---|
| 1 | [power switch] | Switch to "ON / OFF" position to turn the transmitter on / off. |
| 2 | [pairing button for NB16T earbuds] | Press & hold for 5 seconds to enter pairing mode (? for NB16T earbuds, ? for additional headphones). |
| 3 | [pairing button for 2nd headphones] | Once connected, press & hold for 10 seconds to lock the headphones to the transmitter. |
| 4 | [volume +/-] | Tap once to increase / decrease volume. Press & hold both for 7 seconds simultaneously to clear the pairing history. |
LED Indicators (Transmitter)
| No. | Indicators | Status |
|---|---|---|
| A | Left [Bluetooth icon] status, right [Bluetooth icon] status. | |
| Blue flashes every second | Reconnecting | |
| Alternate red & blue flashes | Pairing | |
| Solid blue | Connected | |
| B | "SBC" solid white | Connected with SBC codec |
| "FS" solid white | Connected with FastStream codec | |
| "ATPX" Solid white | Connect with aptX codec | |
| "LL" Solid white | Connect with aptX-LL codec | |
| C | Solid white | Valid audio signal |
| Red flashes every second | Invalid audio signal |
Setting Up
Connecting to Your TV
The transmitter must be connected to a power source via the provided power cable to function. For wall-mounted TVs, use the adhesive pad to attach the transmitter to the wall beside your TV.
You can plug the transmitter into either:
- A TV's USB power port, OR
- A nearby wall outlet - 5V/500mA-2A power source
Once connected to its power source, connect it to your TV's audio ports. Choose one of 3 ways:
OPTION 1: Optical port (recommended)
Plug the provided optical audio cable into the TV's optical OUT or "OPT OUT" port, then plug the other end into the transmitter's optical port.
Diagram Description: Shows a TV's rear panel with an "OPT OUT" port. An optical audio cable (labeled 'E') connects from the TV's port to the transmitter's optical input.
NOTE: Most TVs support audio output through only one digital output port at a time. If your TV's HDMI ARC port is in use, the optical port may be disabled. You can either unplug the HDMI ARC, or try connecting via RCA/AUX.
OPTION 2: AUX 3.5mm port
Plug the provided AUX 3.5mm audio cable into the TV's AUX 3.5mm output port, then plug the other end into the transmitter's AUX 3.5mm port.
Diagram Description: Shows a TV's rear panel with an "AUX IN" port. An AUX 3.5mm audio cable (labeled 'F') connects from the TV's port to the transmitter's AUX input.
OPTION 3: RCA port
Connect the provided RCA adapter to the AUX 3.5mm audio cable. Plug the red & white RCA connectors into the TV's "AUDIO OUT" ports, then plug the other end into the transmitter's AUX 3.5mm port.
Diagram Description: Shows a TV's rear panel with "AUDIO OUT" L/R ports. An AUX 3.5mm audio cable (labeled 'F') connects to an RCA adapter (labeled 'G'), which then connects to the TV's audio out ports.
Connecting the Earbuds to the Transmitter
Now that the transmitter is set up, connect the NB16T earbuds.
STEP 1
Power on the transmitter by sliding the [power switch] to the "ON" position.
STEP 2
Press & hold the earbuds' [MFB button] to power on.
STEP 3
Wait a few seconds. The NB16T earbuds will connect to the transmitter automatically. Once connected, both LED indicators on the earbuds and the left [Bluetooth icon] on the transmitter will turn solid blue. The "FS" indicator on the transmitter will turn solid white.
Diagram Description: Shows the transmitter and earbuds. A dotted line with a [Bluetooth icon] indicates the wireless connection.
Subsequent Use & TV Notes
For subsequent use
If the NB16T earbuds fail to reconnect, manually initiate reconnection by tapping the [Bluetooth icon] on the transmitter once and waiting a few seconds.
NOTE: When Samsung / LG Smart TVs detect your Avantree device, a popup will appear asking you to "Allow / Deny the device to connect to the TV". You MUST DENY the device from connecting, otherwise it will not be able to connect with the other device in its set.
Diagram Description: Shows a TV screen displaying a popup message: "Avantree HT4186 Your permission is required to connect your device to TV." with options to "Allow", "Deny", and "Close". The "Deny" option is highlighted.
Setting Up Your TV (FOR OPTICAL CONNECTIONS ONLY)
If connected via the optical OUT or "OPT OUT" port, configure TV settings before receiving audio.
STEP 1
Using your TV's remote, press SETTINGS and navigate to the AUDIO tab. (Setting names may vary by TV brand).
STEP 2
Proceed to AUDIO OUTPUT and select "OPTICAL OUT / DIGITAL OUT". Many TVs do this automatically; skip if needed.
STEP 3
Set AUDIO OUTPUT format to "PCM / STEREO" ON or "DOLBY" OFF.
Diagram Description: Shows two TV screen interfaces. The first shows "Sound" with "Audio Out" options including "Optical Out". The second shows "Digital Audio Format" with options like "PCM/Stereo" and "Dolby - OFF".
If you have trouble finding these settings, scan the QR code for your TV's brand or visit avantree.com/4186/tv-audio-settings for a detailed guide.
NOTE 1: Smart TVs reset settings after system updates. Ensure your audio output/input format is set to "PCM" and NOT "AUTO" or "Dolby."
NOTE 2: When using Netflix or Amazon Prime, you may need to start the movie/show before changing audio settings to "PCM."
Advanced Features
Using the Earbuds with a Phone
The NB16T earbuds can be used independently as regular Bluetooth headphones. Visit avantree.com/4186/video for a video guide.
STEP 1
Power off the transmitter by sliding the [power switch] to the OFF position.
STEP 2
Enter the NB16T earbuds into pairing mode by pressing and holding the power button for 5 seconds.
Diagram Description: Shows the earbuds with the power button highlighted, indicating a 5-second press for pairing mode. An LED indicator is shown flashing red and blue.
STEP 3
Turn on Bluetooth on your mobile device. Select "Avantree NB16T" from your phone's Bluetooth menu.
For subsequent use, manually initiate reconnection by tapping the earbuds' [MFB button] once or selecting "Avantree NB16T" in your device's Bluetooth menu. Ensure the transmitter is turned off first.
Adding a Second Pair of Headphones
Connect and simultaneously listen through two pairs of headphones. Refer to avantree.com/4186/2nd-headphone-connection for details.
STEP 1
Connect the NB16T earbuds to the transmitter (see "Connecting the Earbuds to the Transmitter" section, Page 11).
STEP 2
Once NB16T earbuds are connected, put the transmitter into pairing mode by pressing & holding the [pairing button] until the LED flashes red & blue alternately.
STEP 3
Put your 2nd pair of Bluetooth headphones into pairing mode. Refer to your headphones' user manual.
STEP 4
Keep the transmitter & 2nd pair of headphones close together for 5-10 seconds until they connect. Once connected, the LED will turn a solid blue.
NOTE: To reconnect the 2nd pair, lock them by pressing & holding the transmitter's [pairing button] for 10 seconds or until the right LED turns solid PINK for 5 seconds.
For subsequent use, ensure your 2nd pair of headphones are not connected to another device, then turn them on and click the transmitter's [pairing button] once to automatically reconnect both devices.
Specifications
Transmitter
| Bluetooth version | v5.0 |
| Supported audio codecs | aptX-LL, aptX, FastStream, SBC |
| Supported profiles | A2DP |
| Operating range | Up to 100ft / 30m |
| Supported audio format in optical mode | PCM / LPCM (96KHZ/16bit) |
| Power port | Micro USB |
| Rated input | DC5V/500mA~2.0A |
| Weight | 32g |
Earbuds
| Bluetooth version | v5.0 |
| Supported audio codecs | FastStream, SBC |
| Supported profiles | HSP V1.2, HFP v1.6, AVRCP V1.4, A2DPV1.2 |
| Operating range | Up to 30ft / 10m |
| Playtime | Up to 20hrs |
| Charging time | ~2.5hrs |
| Frequency response | 20Hz - 20KHz |
| Power port | Micro USB |
| Rated input | DC5V/500mA~2.0A |
| Weight | 32g |
FAQ
Below are some of the most common questions people have during setup.
Can I have audio through my TV's speakers and wireless headphones at the same time?
This depends on whether your TV supports simultaneous audio output to 2 sources. Try different methods to test your TV's capability. Refer to avantree.com/4186/sound for more details.
What's the best way to take care of & maintain upkeep for my earbuds?
Regular cleaning protects from damage and eliminates sound muffling. Use dry cotton swabs to gently wipe dust, earwax, and oil from earbud tips.
How do I connect my Avantree TV headphones / transmitters with my Samsung smart TV?
(See NOTE on page 13 regarding Samsung/LG TV popups.)
Why aren't I getting sound from my headphones?
(Refer to setup instructions and ensure correct audio output is selected on your TV.)
Why aren't I getting sound when watching Netflix / Amazon Prime?
(Refer to NOTE 2 on page 15 regarding Netflix/Amazon Prime settings.)
For answers to these and a full FAQ list, visit avantree.com/support/4186, or contact Avantree directly for assistance.
Contact Us
Support Tickets
Support Email
Phone Support
- USA / CA: +1800 232 2078 (9am-6pm PST, Mon-Fri)
- UK: +44 20 8068 2023 (9am-6pm, GMT, Mon-Sat)
- DE: +49 32221097297 (11am-9pm, CET, Mon-Sat)
- FR: +33 176340312 (11am-9pm, CET, Mon-Sat)
- IT: +39 06 9480 3330 (9am-6pm, CET, Mon-Sat)
- ES: +34 931786261 (9am-6pm, CET, Mon-Sat)
- AU: +61 2 8310 9897 (11am-7pm, AEST, Mon-Fri)
