Watching a match on a gym TV gets frustrating when you can see the action but hear none of the commentary. I’d want that sound in my earbuds without turning up the speakers for everyone nearby.
Auracast makes this possible with compatible equipment. It uses Bluetooth LE Audio to broadcast sound from a source, such as a television, to multiple nearby headphones, earbuds, or hearing aids. Each listener selects the broadcast through supported controls.
In this piece, we’ll learn what Auracast is, how it works, how it uses Bluetooth LE Audio, and do a compatibility check.
Key Takeaways
- Auracast sends shared audio to compatible receivers within coverage, without a separate transmitter connection for every listener.
- A phone or another assistant can help you select the broadcast. Your receiving device plays the audio directly.
- Bluetooth version numbers alone don’t prove compatibility. For that, you need to check the exact product’s supported role and software.
- An Auracast transmitter can add broadcasting to an existing audio source, provided its inputs match that source’s outputs.
What Is Auracast?
Auracast is the Bluetooth Special Interest Group’s broadcast audio capability within Bluetooth LE Audio. It lets a compatible source share sound with nearby earbuds, headphones, hearing aids, or speakers at the same time.
- A compatible television could broadcast its soundtrack to several people’s headphones while keeping the room quiet. But each listener would need equipment that supports Auracast reception.
- An Auracast broadcast carries audio streams alongside information that helps compatible devices discover and select them.
For me, before choosing an Auracast-enabled television, I’d check whether my headphones can receive its broadcast or not.
How Does Auracast Audio Broadcasting Work?
An Auracast setup has a transmitter, assistant, and receiver roles. A product may perform more than one role, but the jobs are distinct.
The transmitter broadcasts audio.
An Auracast transmitter sends audio alongside information describing the broadcast. A television might identify its stream by program or screen name.
Then it sends a shared broadcast instead of allocating a separate audio connection to each listener. Bluetooth SIG describes the receiver count as unlimited within range, because the transmitter doesn’t track individual listeners. But the coverage and compatible hardware still determine who can hear it.
The assistant helps you select a broadcast.
The assistant scans for broadcasts and gives you a way to choose one. That interface might live on a supported phone, hearing aid remote, or another device.
After selection, it supplies your receiver with the information needed to join. The assistant manages discovery and selection; the audio travels directly from the transmitter to the receiver.
Compatible receivers play the audio.
The receiver is the equipment you hear through. Compatible earbuds, headphones, hearing aids, or speakers. Your earbuds receive the selected audio and reproduce it. But an ordinary Bluetooth headset can’t do this even when an app displays a broadcast nearby.
How Auracast Uses Bluetooth LE Audio and LC3
Bluetooth LE Audio is the broader audio framework. Auracast is its broadcast audio capability, so the terms describe different parts of the system.
LE Audio also supports other audio functions. A device advertising Bluetooth LE Audio should therefore be checked specifically for Auracast support.
The framework uses LC3, short for Low Complexity Communications Codec. A codec encodes audio for transmission and decodes it for playback. Bluetooth SIG describes LC3 as offering useful trade-offs between sound quality, data rate, and power consumption.
For a buyer, that means:
- Battery performance depends on the finished device and its configuration.
- Audio quality depends on the source, broadcast settings, and receiver.
- Low latency depends on the complete playback path.
I would compare the performance while using only one, especially when watching TV or some live speech.
Auracast vs. Classic Bluetooth Audio and Multipoint
Auracast handles shared broadcasts. But if we compare it to classic Bluetooth audio, it handles paired audio connections, while multipoint helps a receiving device manage multiple sources.
| Feature | Classic Bluetooth audio | Bluetooth multipoint | Auracast |
| Main purpose | Personal audio connection | Manage sources such as phone and laptop | Share a broadcast with nearby listeners |
| Connection approach | Pair source and receiver | Pair the receiver with supported sources | Select a broadcast using supported controls |
| Listener scaling | Depends on the product’s sharing features | Doesn’t itself create a public broadcast | Compatible receivers tune into the shared broadcast |
| Typical use | Music or calls through headphones | Switch between work audio and phone calls | Shared TV sound or venue audio |
I’d use multipoint for headphones that need to follow my phone and laptop. And I’d consider Auracast when several people need the same audio.
Auracast Devices: How to Check Compatibility
Checking Auracast devices means checking their role and current implementation.
Check Which Auracast Role the Device Supports
These examples identify roles to check. Support varies across products from the same brand.
| Device | Documented function | What to verify |
| Samsung Galaxy Buds3 or Buds3 Pro | Receive broadcasts through Samsung’s documented joining process | Compatible phone, app, and current software |
| JBL Smart Tx | Broadcast from connected audio sources | Source connection and intended receiving device |
| Avantree Audikast 4 | Broadcast TV audio in Auracast mode | TV outputs and listed receiver compatibility |
Verify the model, firmware, and software requirements
Auracast requires relevant features introduced with Bluetooth 5.2, plus the required LE Audio profiles. That version number alone is insufficient.
Before buying an Auracast device, always check:
- The exact model and its supported Auracast role.
- Required firmware, phone software, and companion app.
- Whether support is active or promised through a future update.
- The documented method for selecting broadcasts.
For me, a manufacturer confirmation matters much more than buying just after an upgrade is announced.
How to Choose an Auracast Transmitter for Your TV or Audio System
Choose an Auracast transmitter by matching its inputs to your source, then checking its broadcast controls and receiver support.
These are the questions you should ask:
- Input: Does the transmitter accept the TV’s optical, analog, USB, or HDMI audio output?
- Audio format: Does the source need a particular output setting?
- Power: Will the transmitter remain powered during listening?
- Controls: Can you identify the broadcast and manage access?
- Shared room audio: Can the TV or soundbar continue playing simultaneously?
For example, Avantree’s Audikast 4 accepts optical and AUX connections, but has no direct HDMI input or built-in soundbar passthrough. Its optical setup requires PCM or stereo output. But a conventional Bluetooth transmitter may support paired headphones without supporting Auracast broadcasting.
Where Auracast Helps: Shared Listening and Hearing Accessibility
Auracast is useful when people need access to the same source of audio through their own listening equipment. But its value depends on the installation and the listener’s device.
Shared TV audio and personal listening
When you’re at home, an Auracast transmitter can make a television soundtrack available to any nearby compatible headphones. But at a gym, installed broadcasting could let you select a muted screen’s audio.
Personal sharing can also allow friends to listen to the same songs, but through separate receivers.
Hearing accessibility in public venues
Direct venue audio can help listeners access speech through compatible hearing devices, with less reliance on the room’s amplified sound alone. At Everyman Theatre in Cheltenham, an Auri installation included 32 loan receivers for patrons without suitable personal devices.
That loan option is an interesting thing and deserves attention. Its accessibility depends on supporting visitors whose equipment can’t receive the broadcast.
How to Join an Auracast Broadcast
Joining an Auracast broadcast depends on your equipment. Here’s Samsung’s documented process for Galaxy Buds3 or Buds3 Pro with a supported Galaxy setup:
- Open Settings, then Connections, then Bluetooth.
- Find your earbuds under paired devices and open their settings.
- Select Listen to Auracast broadcast or Find a broadcast, where available.
- Choose the broadcast name and enter its password if prompted.
- Tap Connect and confirm that audio plays through your earbuds.
Samsung’s broadcasting feature is called Audio Broadcast in One UI 8.5.
Follow the instructions for the installed software. If no audio plays, check the source’s output and your receiver’s joining status separately. Some implementations support QR joining, but that needs explicit device support.
Auracast Limitations: Range, Latency, and Privacy
Using an auracast still depends on a usable radio signal, suitable timing, and appropriate access settings.
Range and interference depend on the installation.
Transmitter power, antenna design, and obstacles affect coverage, alongside nearby radio activity. A venue installation and a phone broadcast can have different reach.
For a home setup, I would judge reception from the actual listening position. If audio cuts out, testing closer to the transmitter helps identify a coverage problem.
Audio delay varies by equipment and configuration.
Latency is the delay between source audio and playback. With live sound, your ears may also hear room speakers arriving at a different time.
Avantree’s support guidance describes this as a possible cause of echo. A codec’s timing alone does not establish the delay across an entire setup.
Open and encrypted broadcasts have different access rules
Open broadcasts allow nearby compatible receivers to listen. But encrypted broadcasts require some access credentials. These access arrangements include sharing credentials through supported interfaces.
Final Thoughts
I would pay for Auracast when I have a specific source to hear or people to share it with. For ordinary solo listening, existing headphones already do the job for me.
Before upgrading, confirm if the source, receiving device, and joining controls work together. And for hearing accessibility, ask for a demo.
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FAQs
Yes. The local broadcast uses Bluetooth. Internet access may still be needed for the original streaming service or an app’s separate online functions.
No. Auracast broadcasting carries audio from the transmitter to listeners. Microphone conversations require a separate supported calling, conferencing, or audio connection.
Auracast itself does not require a listener subscription. Equipment, paid content, venue admission, and optional services can still involve charges.
Yes, supported receivers let listeners adjust their own playback volume. The controls depend on the headphones, hearing device, or accompanying interface.
Yes, language tracks can be supplied for No. Automatic translation can only be the result of a separate feature or service, and broadcasts only deliver the tracks provided by it.
