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Interactive user guide

Audikast 4T Setup Guide

TV audio setup

Choose a TV audio output, connect Audikast 4T, then listen with an Auracast device or classic Bluetooth headphones.

1

Step 01

Choose your TV AUDIO OUT

Find one TV port labelled AUDIO OUT.

TaskChoose the first available option below.

  • Check the TV labels

    Use an OUT port, never an IN port.

  • Choose Optical first

    Use OPTICAL or DIGITAL AUDIO OUT when available.

    Recommended
    TV Optical Digital Audio Out port
    Optical cable with purple tips
    Optical cable
    Purple tips
  • No Optical? Use AUX

    Use HEADPHONES, AUX OUT, or AUDIO OUT.

    TV Headphones Audio Out port
    AUX cable with blue ends
    AUX cable
    Blue ends
  • Otherwise use an adapter

    RCA: use an RCA-to-3.5 mm adapter.
    HDMI ARC/eARC: use the Avantree HAX06 HDMI ARC adapter ↗.

    Adapters are separate accessories.
✓

DoneYou have chosen one TV audio output.

If not

Send Support a clear photo of all TV ports with the TV brand and model.

2

Step 02

Connect Audikast 4T to the TV

Power the transmitter, then connect one audio cable.

TaskConnect the cable chosen in Step 01.

  • Power on

    Connect USB-C power, then slide the power switch to ON.

    USB-C power connected to Audikast 4T and its power switch moved to ON
  • Connect Optical

    Remove both clear tip covers. Connect TV OPTICAL OUT to Audikast 4T OPTICAL.

    Do not bend the optical cable sharply.
    Optical cable with purple square-ended connectors
    Optical cable connected between Audikast 4T and a TV Optical Digital Audio Out port
  • Or connect AUX

    Connect TV HEADPHONES / AUDIO OUT to Audikast 4T AUX.

    AUX cable with blue 3.5 mm connectors
    Blue AUX cable connected between Audikast 4T and a TV Headphones Audio Out port
✓

DoneAudikast 4T is on and connected to the TV.

If not

Push both cable ends in fully and confirm the TV port is labelled OUT.

3

Step 03

Set Optical Audio to PCM

Optical users must set the TV to PCM. AUX users can skip this step.

TaskSet the TV's Optical audio format to PCM.

  • Open Sound settings

    On the TV remote, open Settings → Sound.

  • Choose Optical output

    Select Optical, External Speaker or Audio System.

  • Choose PCM

    Set Digital Audio Format to PCM or Stereo.

    Do not use Dolby, DTS, Auto, or Bitstream.
  • Open the TV PCM guide
✓

DoneThe TV output is Optical and the format is PCM or Stereo.

If not

Open the brand-by-brand PCM guide for the exact TV menu path.

4

Step 04

Choose Bluetooth or Auracast

Choose the path that matches your listening device.

TaskSelect your listening device below.

✓

DoneYou have opened the setup path for your listening device.

If not

Check whether your exact hearing-aid, headphone, or speaker model supports Auracast.

5

Step 05

Connect with Auracast

Use the right Auracast button and choose the mode for your listening device.

TaskStart broadcasting, then join from the Auracast device.

  • Start the broadcast

    Short-press the right Auracast button.

  • Choose the device mode

    Hearing aids: hearing-aid light solid white.
    Auracast headphones or speakers: hold the Auracast button until the headphones/speakers light is solid orange.

  • Check the audio signal

    Play TV audio. The center Audio Signal light should be solid white.

    Solid white means audio is entering Audikast 4T and broadcasting.
  • Join the broadcast

    On the hearing aids, headphones, or speaker, open its Auracast Assistant or app and select Audikast 4T.

Choose your hearing-aid brand guide
JabraReSoundOticonStarkeyPhilipsBeltoneWidexCochlearDanalogicBernafonNuEarPhonakFortell
✓

DoneYour Auracast device plays the TV audio.

If not

Confirm the center Audio Signal light is solid white, confirm the correct device-mode indicator, then search again in the device app.

6

Step 06

Pair classic Bluetooth

Use this path for traditional Bluetooth headphones or one Bluetooth speaker.

TaskPut Audikast 4T and the listening device into pairing mode.

  • Start Audikast 4T pairing

    Hold the left Bluetooth button until the Bluetooth light flashes red and blue quickly.

    Fast red/blue flashing means pairing mode.
  • Start headphone or speaker pairing

    Put the Bluetooth headphones or speaker into pairing mode and keep it within 1 m / 3 ft.

    Powering on alone may not start pairing.
Headphone pairing helpChoose brand

Choose a brand to see its pairing steps.

AirPods / AirPods Pro

  1. AirPods 1–3 and AirPods Pro 1–2: keep them in the case, open the lid, then hold the rear setup button for about 5 seconds.
  2. AirPods 4 and AirPods Pro 3: keep them in the case, open the lid, then double-tap the front of the case.

Ready when: the case light flashes white.

AirPods Max

  1. Press and hold the noise control button for about 5 seconds.

Ready when: the status light flashes white.

Bose

  1. Turn on the headphones or open the earbud case.
  2. Hold the Bluetooth or power button until the light flashes blue or you hear “Ready to connect.”

Ready when: the light flashes blue or the voice prompt confirms pairing.

Beats

  1. Turn on the headphones.
  2. Hold the system or power button until the indicator flashes.

Ready when: the indicator flashes for pairing.

Sony

  1. With the headphones off, hold the power button for about 5 seconds.
  2. For Sony earbuds, use the case or touch-sensor pairing command for your exact model.

Ready when: the light flashes blue or you hear “Bluetooth pairing.”

Samsung Galaxy Buds

  1. Place both earbuds in the case, close it for 5–6 seconds, then open it.
  2. If pairing does not start, wear both earbuds and touch both touchpads until you hear the pairing sound.

Ready when: the earbuds announce pairing or show their pairing pattern.

JBL

  1. Hold the Bluetooth or power button until the indicator flashes rapidly.
  2. If JBL reconnects to a phone, turn that phone Bluetooth off and try again.

Ready when: the indicator flashes rapidly.

Other headphones

  1. Hold the power, Bluetooth, or main button until the light flashes rapidly.
  2. Check the headphone manual for the exact command if the light does not change.

Ready when: the headphones show their documented pairing pattern.

  • Wait for connection

    Wait until the Audikast 4T Bluetooth light stays solid blue, then play TV audio.

    Solid blue means connected.
✓

DoneThe Bluetooth light is solid blue and TV audio plays.

If not

Turn off Bluetooth on nearby phones, keep the devices within 1 m / 3 ft, put both into pairing mode again, and wait.

Quick help

Fix the common problems

01No TV sound through the listening device
Problem
The listening device is connected, but no TV audio plays.
Possible cause
The cable uses an input port, Optical is not set to PCM, audio is paused, or a cable is loose.
Solution
Play TV audio; push both cable ends in; select the matching TV AUDIO OUT; for Optical, choose PCM or Stereo; then raise the TV and listening-device volume.
Expected result
The center Audio Signal light is solid white and TV audio plays.
02Hearing aids cannot join or reconnect
Problem
The hearing-aid app cannot find Audikast 4T or a previous connection does not return.
Possible cause
The broadcast is off, the headphones/speakers mode is selected, the hearing aids are not Auracast-compatible, or the app scan is stale.
Solution
Short-press the right Auracast button. Confirm the hearing-aid indicator is solid white and the center Audio Signal light is solid white. Close and reopen the hearing-aid app, scan again, and select Audikast 4T.
Expected result
Audikast 4T appears in the Auracast list and the hearing aids play TV audio.
03Bluetooth headphones will not connect
Problem
The Audikast 4T Bluetooth light keeps flashing and never turns solid blue.
Possible cause
The headphones are only powered on, are connected to a nearby device, or are too far away.
Solution
Turn off Bluetooth on nearby phones and computers. Keep both devices within 1 m / 3 ft. Hold the left Audikast 4T button until red and blue flash quickly, then put the headphones into their documented pairing mode.
Expected result
The Bluetooth light turns solid blue and TV audio plays.
More quick fixes

More help

Optional and reference guides

01Soundbar connection optionsConnect Audikast 4T alongside an Optical or HDMI ARC/eARC soundbar.
Open soundbar guide ↗View HAX06 ↗
02Official help and compatibilityCheck supported devices, controls, and product-specific support.
Audikast 4 / BTTC-480 support ↗Audikast 4T product page ↗
03Firmware updater — only when neededUpdate firmware when directed by Avantree Support or to receive documented fixes.
Open Audikast 4T firmware updater ↗