If your Sonos Arc is not connecting to TV audio, the issue usually comes down to HDMI-ARC setup, TV settings, cable compatibility, or a handshake problem between devices.
This guide walks through the most common causes and the exact checks that usually restore sound.
Why the Sonos Arc may not connect to your TV
The Sonos Arc relies on HDMI ARC or eARC to receive audio from a television.
Unlike older soundbars that can work through optical only, the Arc depends on the TV sending audio over the correct HDMI port with the right control signals enabled.
When the connection fails, the problem is often not the soundbar itself.
It may be the TV’s audio output setting, a disabled HDMI-CEC feature, a damaged cable, or a mismatch between the TV’s format support and the Arc’s expectations.
Check the physical connection first
Start with the simplest layer: the cable path between the Sonos Arc and the TV.
A loose connector or the wrong HDMI port can block audio entirely.
- Confirm the Arc is connected to the TV’s HDMI ARC or HDMI eARC port.
- Use the Sonos-supplied HDMI cable or a high-speed HDMI cable that supports ARC/eARC.
- Unplug and firmly reseat both ends of the cable.
- Inspect the cable for visible damage or bent pins in any adapter used.
- If your TV requires an optical adapter, verify that the Arc is configured correctly in the Sonos app.
Many televisions have multiple HDMI ports, but only one is designed for ARC or eARC.
Connecting to a standard HDMI input will usually result in no sound.
Verify the TV’s audio output settings
Once the hardware is confirmed, the TV’s sound settings should be checked next.
Most modern TVs need to be told to send audio to an external speaker rather than the internal speakers.
Look for settings such as:
- Audio Output: HDMI ARC, HDMI eARC, External Speaker, or Receiver
- TV Speaker: Off or External Audio System
- Digital Audio Out: Auto, Passthrough, or Bitstream
- eARC Mode: Auto or On
If the TV is still set to internal speakers, the Sonos Arc will appear connected in the app but produce no TV sound.
Some TVs also require the digital audio output to be set to Auto rather than PCM only, especially when using surround formats.
Make sure HDMI-CEC is enabled
HDMI-CEC is a critical part of the Sonos Arc experience because it lets the TV and soundbar communicate volume, power, and input commands.
Different brands use different names for CEC, but the feature must usually be turned on for ARC/eARC to work properly.
Common brand names include:
- Simplink on LG
- Anynet+ on Samsung
- Bravia Sync on Sony
- Viera Link on Panasonic
- CEC or HDMI Control on many other brands
If CEC is off, the TV may fail to pass audio consistently or may not recognize the Sonos Arc as an audio device at all.
After enabling CEC, power-cycle both devices to force a fresh handshake.
Update the Sonos app and the TV firmware
Software mismatches can create connection issues even when the wiring is correct.
Sonos regularly updates support for streaming formats and device compatibility, while television manufacturers issue firmware updates that improve ARC and eARC behavior.
Check the following:
- The Sonos app is updated to the latest version on your phone or tablet.
- The Sonos Arc has the latest system update installed.
- The TV firmware is current.
- Any connected devices, such as Apple TV, Roku, or game consoles, are also updated if they pass through the TV audio chain.
After updates, restart the TV and the soundbar.
A cold reboot often clears temporary HDMI handshake errors that keep audio from routing correctly.
Use the Sonos app to confirm TV setup
The Sonos app can reveal whether the Arc is configured properly for television audio.
Open the app and check the room associated with the Arc for status messages, setup prompts, or update notifications.
During setup, the app may ask you to:
- Confirm the Arc is connected to the TV’s ARC or eARC port
- Test the infrared remote or TV remote control integration
- Enable device control through CEC
- Verify the TV audio output type
If the app shows the Arc as online but no TV audio arrives, that usually points to the television side of the connection rather than the Sonos speaker itself.
What if your TV only has optical audio?
Some older TVs do not support ARC or eARC.
In that case, the Sonos Arc can still work, but only through the Sonos optical audio adapter, which converts the TV’s optical output for use with the soundbar.
Keep in mind that optical has limitations compared with HDMI ARC/eARC:
- It does not support all advanced audio formats
- It may not pass Dolby Atmos
- TV volume control integration can be less seamless
If your setup depends on optical, verify that the adapter is fully inserted and that the TV’s digital audio output is enabled.
Many users accidentally leave the TV set to internal speakers while the optical cable is connected.
How to fix common handshake problems
HDMI devices communicate through a handshake process each time they power on.
If the TV and Sonos Arc do not negotiate correctly, the result can be missing audio, delayed audio, or sound that cuts out after startup.
Try this sequence:
- Turn off the TV and Sonos Arc.
- Unplug both from power for at least 30 seconds.
- Disconnect the HDMI cable from both ends.
- Reconnect the HDMI cable securely.
- Power on the TV first, then the Sonos Arc.
- Wait for the TV to fully load before testing audio.
This process forces both devices to rediscover each other and often resolves intermittent connection failures.
Check for format compatibility issues
Some televisions and streaming devices send audio formats that the current setup cannot handle cleanly.
Sonos Arc supports modern surround sound formats, including Dolby Atmos on compatible TVs and sources, but the TV must be able to pass them through correctly.
If audio fails only with certain apps or sources, review these settings:
- Set the TV digital audio output to Auto or Passthrough if available
- Disable forced PCM if it prevents surround output
- Check whether the source device is connected to the TV or directly to the Arc-compatible HDMI chain
- Test another app or input to isolate the problem
Some streaming apps behave differently from over-the-air TV or external consoles.
If one source works and another does not, the issue may be format-specific rather than a total connection failure.
When to reset the Sonos Arc
A full reset should be a last resort, but it can help if the Arc has persistent setup corruption or refuses to detect the TV after all basic troubleshooting.
Before resetting, try reauthorizing the TV connection in the Sonos app and power-cycling the system.
Consider a reset only if:
- The Arc has no TV audio after multiple cable and setting checks
- The Sonos app repeatedly fails to recognize the TV connection
- Settings appear correct, but the soundbar never receives audio
After a reset, you will need to set up the Sonos Arc again in the Sonos app and reconnect it to the TV from scratch.
When the issue is likely the TV itself
Sometimes the Sonos Arc is working properly and the television is the real source of failure.
This is more likely with older firmware, nonstandard ARC behavior, or TVs known to have unstable eARC implementations.
Signs the TV may be the problem include:
- Other ARC soundbars also fail on the same port
- The TV recognizes the Sonos Arc but never outputs sound
- Audio works briefly, then stops after standby or input switching
- CEC behaves inconsistently across different HDMI devices
If possible, test the Arc on another TV or test another ARC soundbar on the same TV.
That comparison quickly identifies whether the fault lies with the soundbar or the television.
Best practices to prevent future connection issues
Once the Sonos Arc is connected correctly, a few habits can reduce the chance of the problem returning.
Stable HDMI behavior depends on consistent settings and quality hardware.
- Leave HDMI-CEC enabled unless you have a specific compatibility reason to disable it
- Use a certified high-speed HDMI cable for ARC/eARC connections
- Keep TV firmware and Sonos software updated
- Avoid frequent cable swapping on the ARC/eARC port
- Power the TV on first when troubleshooting after outages or updates
For most households, the combination of the correct HDMI port, enabled CEC, updated firmware, and the right audio output setting resolves the Sonos Arc not connecting to TV problem without needing advanced support.