User Manual
EN

Interactive user guide

Harmony A0 Setup Guide

Connect one source. Play it through every speaker.

Follow four steps to start the Harmony A0 Auracast five-speaker system.

Start SetupFix a problem
1

Connect power

  1. Connect the transmitter to power with a USB-C cable and power adapter.
  2. Switch the transmitter to ON.
DoneThe transmitter indicators turn on.
If notReseat the power cable.Still off? Try another power adapter and outlet.
2

Choose your source

Choose the device that sends audio to the transmitter.

3

Connect Optical

TV / Media Device

  1. Short-press AUX/OPT once on the transmitter to select OPT input.OPT indicator: blinking red.
  2. Remove the clear caps from both ends of the optical cable.
  3. Connect Optical Out on the TV/source to Optical on the transmitter.
  4. On the TV/source, select Optical output and set the format to PCM.
    ✓PCM
    ✕Dolby / DTS / Bitstream / Auto — No sound.
DoneThe audio indicator responds and listeners hear the TV audio.
If notPort: use Optical Out, not In.Format: select PCM.
Not sure how to set PCM?Open the Brand-by-Brand TV Guide →
Source connected — next: Step 4
3

Connect analog audio

Mixer / AV System

Choose the correct output and cable. The wrong cable may cause low volume, missing vocals, or poor sound quality.
  1. Confirm AUX inputThe transmitter starts in AUX input mode. Confirm the AUX indicator is blinking red.If not, short-press AUX/OPT once.
  2. Check the source outputLook for XLR, 6.35 mm, RCA, or 3.5 mm output ports.
  3. Choose your outputSelect the matching option below.

How many XLR outputs will you use?

Dual XLR Output

  1. Use a dual XLR female-to-unbalanced 3.5 mm TRS cable.Wrong cable? It may cause low volume or missing vocals.
  2. Connect the XLR plugs to mixer Output L / R.
  3. Connect the 3.5 mm plug to the transmitter AUX In.
Mixer OUTPUT L / RDual XLR female-to-3.5 mm TRS cabletransmitter AUX IN
Dual XLR mixer outputs connected to transmitter AUX In
The transmitter rear panel; the AUX input is the second port from the left

Stereo mixer output recommended

Done: the transmitter audio indicator responds and listeners hear clear stereo audio.
If not:
  1. Check both plugs are in mixer Output L / R.
  2. Unmute the mixer output.
  3. Lower the mixer level.
Cable not included. Buy separately if needed →
Source connected — next: Step 4

Single XLR Output

  1. Use a single XLR female-to-unbalanced 3.5 mm TRS cable.Mono output: A single XLR carries mono audio.
    Wrong cable? It may cause low volume or poor sound quality.
  2. Connect the XLR plug to the mixer Output.
  3. Connect the 3.5 mm plug to the transmitter AUX In.
Mixer OUTPUTSingle XLR female-to-3.5 mm TRS cabletransmitter AUX IN
Single XLR mixer output connected to transmitter AUX In
The transmitter rear panel; the AUX input is the second port from the left

Mono output only

Done: the transmitter audio indicator responds and listeners hear the mono source audio.
If not:
  1. Check the cable is unbalanced 3.5 mm TRS.
  2. Use a mixer output jack.
  3. Unmute the mixer output.
Cable not included. Buy separately if needed →
Source connected — next: Step 4

6.35 mm Output

  1. Use the included dual 6.35 mm-to-3.5 mm cable.Wrong cable? It may cause poor sound quality.
  2. Connect the two 6.35 mm plugs to mixer Output L / R.
  3. Connect the 3.5 mm plug to the transmitter AUX In.
Mixer OUTPUT L / RDual 6.35 mm-to-3.5 mm cabletransmitter AUX IN
Dual 6.35 mm mixer outputs connected to transmitter AUX In
The transmitter rear panel; the AUX input is the second port from the left

Stereo mixer output recommended

DoneThe audio indicator responds and listeners hear clear stereo audio.
If not:
  1. Connect both plugs to Output L / R.
  2. Unmute the mixer output.
  3. If sound is distorted, lower the source level.
Source connected — next: Step 4

RCA / 3.5 mm Output

Choose the matching output. Connect only an audio output to the transmitter AUX In.
RCA Output

Connect RCA Out to the transmitter AUX In with an RCA-to-3.5 mm cable.

Source RCA OUT L / RRCA-to-3.5 mm cabletransmitter AUX IN
RCA left and right outputs connected to transmitter AUX In
The transmitter rear panel; the AUX input is the second port from the left
RCA cable not included. Buy separately if needed →
3.5 mm Output

Connect 3.5 mm Out to the transmitter AUX In with the included 3.5 mm-to-3.5 mm cable.

Source 3.5 mm OUT3.5 mm-to-3.5 mm cabletransmitter AUX IN
3.5 mm audio output connected to transmitter AUX In
The transmitter rear panel; the AUX input is the second port from the left
DoneThe audio indicator responds and listeners hear clear audio.
If not:
  1. Use an audio output, not an input.
  2. Unmute the source.
  3. Raise the source volume gradually.
Source connected — next: Step 4
3

Connect with Bluetooth

Phone / Tablet / Computer

Keep your phone close to the transmitter while pairing.

  1. Start pairing: Short-press Phone/Pair once on the transmitter.The transmitter's Phone light: blinking red and blue.If not, press and hold Phone/Pair.
  2. Connect your source: open Bluetooth settings and select the transmitter.
  3. Play audio on the phone, tablet, or computer.
Keep the phone near the transmitter rather than in a pocket while pairing
For a better experience: use a wired audio input for best stability.Bluetooth range: approximately 10–15 m (30–50 ft).
DoneThe audio indicator responds and listeners hear the source audio.
How It Works: Bluetooth sends audio to the transmitter. Listeners receive it through Auracast.
If not

The transmitter not listed?

  1. Turn off Bluetooth on the previous source.
  2. Start pairing again.
  3. Move the devices closer.
Source connected — next: Step 4
4

Listen from the speakers

Before you start: finish Steps 2–3 — choose and connect your audio source.

  1. On each of the five Harmony A0 speakers, hold the Power / mode button for 2 seconds.The speaker starts in Auracast mode and searches for the transmitter.
  2. Play audio from the connected source.

Video: turn on a Harmony A0 speaker and check its mode light.

Done

Auracast light: solid orange on each speaker.

All speakers play the same audio.

If not

Light flashing orange or off?

  1. Double-press the speaker's Power / mode button to return to Auracast mode.
  2. Move the speaker near the transmitter and wait for the light to turn solid orange.

Still no audio? Fix a problem →

Placement

Placement tips

Transmitter

  • Place in the center.
  • Clear line of sight.
  • Up to 330 ft.

Phone

  • Keep next to transmitter.
  • Do not keep in pocket.
Correct: keep the phone next to the transmitterIncorrect: do not keep the phone in a pocket

Optional expansion

Add speakers

Add more Auracast speakers to expand your system.

Other brands

  • Use phone app to join Auracast.
  • Auto-connect not guaranteed.

Quick help

Fix common problems

01One or more speakers have no audio

Problem: The speaker light is flashing orange or off, and that speaker is silent.

Possible cause: The speaker is in Bluetooth mode, is too far from the transmitter, or the transmitter is not receiving audio.

Solution: Confirm the transmitter is on and playing audio. Double-press the speaker's Power / mode button, then move the speaker near the transmitter.

Expected result: The speaker light turns solid orange and the speaker plays the same audio as the other speakers.

02Volume is too low

Problem: The speakers are connected, but the sound is too quiet.

Possible cause: The source, transmitter, or individual speaker volume is low.

Solution: Set the TV, phone, or computer volume to about 80%. Press + on the Harmony A0 transmitter, then press + on each quiet speaker.

Expected result: Audio becomes louder without losing the solid orange connection light. Open the volume guide →

03A speaker will not pair by Bluetooth

Problem: The phone or computer cannot find or connect to the Harmony A0 speaker.

Possible cause: The speaker is still in Auracast mode or has an old Bluetooth pairing.

Solution: Double-press the speaker's Power / mode button. If the light does not flash red and blue, hold Play / pause for 2 seconds. Select Venucast Harmony A0 Solo in the device's Bluetooth settings. If pairing still fails, hold + and − together for 5 seconds to clear Bluetooth pairing history, then try again.

Expected result: The speaker light turns solid blue. Open the reset guide →

MoreMore quick fixes

Firmware update

Update Harmony A0

Update speakers

Update each speaker separately, one at a time.

  1. Download the Firmware Update Tool.

  2. Connect one Harmony A0 speaker to your computer.

    Firmware update cable: Use the gray-tip cable included with your device.

    Mac users: an Apple charging cable also works.

  3. Run the updater.

    Follow its instructions and keep one Harmony A0 speaker connected until the update is complete.

After updating, reset each speaker.

Update the transmitter

  1. Download the Firmware Update Tool.

  2. Connect the Harmony A0 transmitter to your computer.

    Firmware update cable: Use the gray-tip cable included with your device.

    Mac users: an Apple charging cable also works.

  3. Run the updater.

    Follow its instructions and keep the Harmony A0 transmitter connected until the update is complete.

After updating: reset transmitter.
Open Harmony A0 firmware page Notify me about updates

PC tool · Optional

Change advanced broadcast settings

Connect the Harmony A0 transmitter to your computer.

Open the Firmware Update Tool and select Advanced.

Example Oasis Aura Firmware Update Tool screen with Avantree branding. Select the image to enlarge.

Firmware Update Tool Advanced screen showing broadcast name, encryption, default volume, QR code, and receiver synchronization controls
Rename the broadcast
Change the name listeners see when they search for Harmony A0.
Encrypt the broadcast
Add a passcode so only listeners with the correct code can join.
Set the default volume
Adjust the transmitter's default broadcast volume.
Generate a broadcast QR code
Create a QR code for joining the broadcast.Requires: compatible hearing aids and an app that supports joining by QR code.
Use Group Settings
Apply the same broadcast name and passcode to multiple supported receivers. Learn about Group Settings →

Optional expansion

Extend the range

Use Daisy Chain to extend coverage.

  • Typical setup: 2 × Harmony A0 + 1 × AuraLink

Original coverage

Harmony A0 transmitterTransmitter 1
Harmony A0 speakerHarmony A0 speakerHarmony A0 speaker
Harmony A0 speakers
AuraLink receiverAuraLink

3.5 mm AUX cable

AuraLink AUX out → Transmitter 2 AUX in

Extended coverage

Second Harmony A0 transmitterTransmitter 2
Harmony A0 speakerHarmony A0 speakerHarmony A0 speaker
Harmony A0 speakers

Speaker mode

Use as Bluetooth Speaker

  1. Hold the speaker's Power / mode button for 2 seconds.The Harmony A0 speaker starts in Auracast mode and its light flashes orange.
  2. Double-press the same Power / mode button.Bluetooth pairing light: flashing red and blue.
  3. On your device, turn on Bluetooth and select Venucast Harmony A0 Solo.

Connected: The LED turns solid blue.

If not
  1. If the light does not flash red and blue, hold the speaker's Play / pause button for 2 seconds.
  2. Open Bluetooth settings on your source device and select Venucast Harmony A0 Solo.

Still cannot pair? Open Bluetooth pairing help →

Video: switch a Harmony A0 speaker to Bluetooth mode and connect it to your device.

Charging

Charge the Harmony A0 speakers

Charge each speaker with the included USB-C cable and a 5 V / 1 A USB power source. A full charge takes about 4 hours.

Charging light: Solid red. The light turns off when the speaker is fully charged.

Need more help?

Our support team is here for you.

Contact Support

Was this helpful?