Power it
Connect the included USB-C cable to a 5 V, 500 mA–2 A power source. Slide the power switch to ON.
Expected: the display and LEDs turn on.
Skip to guide
Audikast 3Bluetooth 5.3 · Model BTTC-4181 2 3 Optical (recommended) AUX / 3.5 mm Only HDMI ARC? ON/OFF A / B OPT / AUX +/− OPT VOLUME RESET
EN
Interactive user guide · Audikast 3
TV sound to your Bluetooth device.
Send TV sound to one or two Bluetooth headphones, earbuds, speakers, or compatible hearing aids.
Audikast 3Bluetooth 5.3 · Model BTTC-418Start here
Connect the TV first.
Power Audikast 3, choose the cable that matches your TV output, then set the TV audio correctly. If your TV brand is not listed, use the universal menu path below.
Choose one TV audio output
Look at the labels beside your TV ports. Match one output to the corresponding Audikast 3 input.
Use only one audio cable. Optical is recommended when available.
Set TV audio
For Optical, select Optical output and set the digital audio format to PCM.
No sound? Dolby, DTS, Bitstream, or Auto can produce silence; use PCM.
Which cable should I use?
Find the matching output label on your TV. Do not connect to an input port.
OPTICAL
DIGITAL AUDIO OUT
Remove the clear tip covers. Connect TV Optical Out to Audikast 3 OPTICAL input. The OPT light may flash until the TV sends PCM audio.DIGITAL AUDIO OUT
HEADPHONES
🎧
Connect TV Headphones / Audio Out to Audikast 3 AUX input, then raise the TV headphone/output volume.🎧
HDMI
(ARC/eARC)
Audikast 3 has no HDMI input. Use a compatible HDMI ARC/eARC-to-Optical extractor such as HAX06.View HAX06 →(ARC/eARC)
Not sure? Audikast 3 connects to a TV audio output, not an input. Send Support a clear photo of all TV ports and include the TV brand and model.
Set Optical output + PCM on your TV
Universal path: Settings → Sound / Audio → Audio Output: Optical → Digital Audio Format: PCM / Stereo. Then use a brand shortcut if available; menu names vary by model.
Open the full TV PCM guide →MORE WAYS TO LISTEN
Choose what you need.
Use hearing aidsCompatibility depends on the Bluetooth type
Compatible: some hearing aids that accept standard Classic Bluetooth audio, including supported Phonak, Unitron, and Kirkland models.
Not compatible: hearing aids that require Auracast / LE Audio, MFi, or ASHA. Confirm the exact brand and model before setup.
Check hearing-aid compatibility →Connect two listenersHeadphones, earbuds, or Bluetooth speakers
Keep listener 1 connected. Put listener 2 in true pairing mode, then hold the Audikast 3 listener-2 pairing button for 5 seconds until it flashes red + blue. Solid blue means connected.
Fix a dual-link issue →Adjust volumeTransmitter, headphones, or audio source
- Use + / − on Audikast 3 for output level.
- For AUX, also raise the TV headphone/output volume.
- For Optical, use + / − to apply up to 6 dB boost; TV volume may not control Optical output.
Fix a problem
What is happening?
Choose the closest symptom. Each fix includes the expected result and next step.
Restore the audio signal
- Play a program on the TV/computer.
- Confirm the cable is connected to an output: Optical Out or Headphones/Audio Out.
- Set the Audikast 3 input selector to OPT or AUX to match the cable.
- For Optical, set TV Digital Audio Format to PCM. For AUX, raise source volume.
- Check the OPT/AUX signal light.
Expected: OPT or AUX is solid white and listener 1/2 is solid blue, and audio plays.
Signal light still flashing: the transmitter is not receiving usable audio. Try another TV program, reseat the cable, and open the official no-sound guide.
Restart pairing correctly
- Turn off Bluetooth on phones, tablets, computers, and TVs that may steal the connection.
- Put the listening device into pairing mode; confirm its fast-blinking light or pairing prompt.
- Hold the matching Audikast 3 1/2 pairing button for 5 seconds until it blinks red and blue.
- Keep the devices within 1 m and wait up to 30 seconds.
- If it still fails, clear Audikast 3 pairing history using the official reset guide, then pair again.
Expected: the matching 1/2 indicator becomes solid blue.
Reduce lip-sync delay
- For best sync, use headphones that support aptX Adaptive or aptX Low Latency.
- AirPods use SBC/AAC rather than aptX Adaptive, so some delay may remain.
- Disable extra TV audio processing when available.
- Do not use two different wireless paths at once if synchronization is critical.
Expected: speech and picture move closer together.
Still delayed? Open the official audio-lag article for device-specific limits.
Reference
Buttons, lights, and official help.
Power switch
Slide to ON after USB-C power is connected. Slide to OFF to shut down.
Pairing and reconnect
Blinking red + blue means pairing. Solid blue means connected. Press to reconnect; hold to start pairing.
Audio signal
Solid white means a valid audio signal. Flashing white means the TV is not sending usable audio—check the output port, playback, and PCM.
Volume buttons
Adjust transmitter output volume. These buttons also provide up to 6 dB of boost for Optical input.
Optical boost
Use + / − when Optical sound remains low. Optical boost supports up to 6 dB.
Clear pairing history
Use the official factory-reset steps when old devices keep reconnecting or pairing repeatedly fails.
STILL NEED HELP?
Get the right help for Audikast 3.
Choose Audikast 3 / BTTC-418. Include your TV/computer model, listening-device model, cable type, and the exact 1/2 and OPT/AUX light patterns.
RECOMMENDEDSubmit an Audikast 3 support ticketThe form accepts photos and screenshots. A clear photo of the TV ports is especially useful.Start support request →
DON'T WANT TO SUBMIT A TICKET?
Talk to a real support agent.
PAIR YOUR HEADPHONES
Pair one or two Bluetooth listeners.
Keep Audikast 3 and the headphones within 3 ft / 1 m while pairing.
STEP 1
Put your headphones in pairing mode.
Turn off Bluetooth on nearby phones and computers first. Simply turning headphones on is not enough.
Choose your headphones
Pairing instructions
✓
Success: the headphone or case light flashes rapidly.
STEP 2
Start pairing on Audikast 3.
If side 1 is not already searching, hold the 1-side pairing button for 5 seconds.
Red + blue flashingSide 1 is searching
Keep the devices close
- Place the headphones within 3 ft / 1 m.
- Keep nearby phones and computers disconnected from them.
- Wait while both products search automatically.
Do not continue until side 1 becomes solid blue.
STEP 3
Confirm the connection.
The connection completes automatically after both products enter pairing mode.
Listener 1 solid blueHeadphones connected
Test the result
- Play TV audio.
- Confirm OPT or AUX matches the connected TV cable.
- Raise the headphone volume.
✓
Success: audio plays through the first headphones.
Still flashing? Re-enter true headphone pairing mode, turn off nearby Bluetooth, then restart both products.
STEP 4
Add a second listener—optional.
Leave the first headphones connected while pairing the second set.
1 and 2 solid blueBoth listeners connected
Pair side 2
- Put the second headphones in pairing mode.
- Hold the 2-side pairing button for 5 seconds until listener 2 flashes red and blue.
- Wait for listener 2 to become solid blue.
✓
Success: both listeners hear the same TV audio.
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