How to Connect Sonos Arc to Roku TV
Knowing how to connect Sonos Arc to Roku TV can turn a basic streaming setup into a true home theater experience.
The key is using the right HDMI port, matching the audio format, and confirming that both devices are configured for TV audio output.
The process is usually straightforward, but Roku TV models vary by manufacturer, which is why the exact settings matter.
A few simple checks can make the difference between silence, stereo sound, and full Dolby Atmos playback.
What You Need Before You Start
Before connecting the soundbar, confirm that your Roku TV supports HDMI ARC or HDMI eARC.
Sonos Arc is designed to work through one of these return-audio ports, not through an optical cable unless you use the Sonos Optical Audio Adapter.
- Sonos Arc with power cable
- Roku TV with an HDMI ARC/eARC port
- High-speed HDMI cable
- Sonos app installed on a phone or tablet
- Wi-Fi network for setup and updates
If your Roku TV has multiple HDMI ports, look for one labeled ARC or eARC.
That port is essential because it sends audio from the TV back to the Sonos Arc.
How to Connect Sonos Arc to Roku TV Using HDMI ARC or eARC
- Turn off the Roku TV and unplug the Sonos Arc if it is already powered on.
- Connect one end of the HDMI cable to the HDMI ARC/eARC port on the Roku TV.
- Connect the other end to the HDMI port on the Sonos Arc.
- Plug the Sonos Arc into power and turn on the Roku TV.
- Follow the on-screen TV prompts if Roku detects the soundbar automatically.
- Open the Sonos app to complete setup, confirm room name, and check for updates.
In many cases, Roku TV will recognize the Sonos Arc as an external audio device right away.
If it does not, you may need to manually change the sound output in the TV settings.
Configure Roku TV Audio Settings
To get reliable playback, set Roku TV to send audio through the HDMI ARC connection.
The menu names can differ slightly depending on the brand, but the path is usually similar.
- Press Home on the Roku remote.
- Go to Settings.
- Select Audio or Sound.
- Set Speakers or Audio output to HDMI ARC, External speaker, or a similar option.
- Enable Auto passthrough if available.
- Set Digital output format to Auto or Passthrough for the best compatibility.
If your Roku TV offers a choice between stereo and multichannel output, choose the option that keeps advanced formats enabled.
This helps the Sonos Arc receive Dolby Digital, Dolby Digital Plus, and in supported cases Dolby Atmos.
Set Up Sonos Arc in the Sonos App
The Sonos app is useful even after the physical connection works, because it verifies the speaker, updates firmware, and helps you confirm the TV input.
After launching the app, follow the setup prompts to add Sonos Arc to your home system.
- Confirm the soundbar is assigned to the correct room.
- Check for software updates in Settings.
- Run the TV audio setup if prompted.
- Test playback from Roku apps such as Netflix, Prime Video, or Disney+.
Some streaming services support advanced formats only on specific plans or devices.
If you want Dolby Atmos, make sure the content, Roku TV, and Sonos Arc all support it.
How to Enable Dolby Atmos on Roku TV and Sonos Arc?
Dolby Atmos can deliver more spatial, layered sound, but only if the chain from app to TV to soundbar supports it.
On Roku TV, the app and TV model must both pass Atmos through HDMI eARC or compatible ARC implementations.
To improve your chances of Atmos playback, use these settings:
- Set the Roku TV audio output to Passthrough or Auto.
- Use the TV’s eARC port if available.
- Keep the Sonos Arc updated in the Sonos app.
- Stream Atmos-enabled content from supported apps and titles.
You can confirm audio status in the Sonos app when a compatible movie or show is playing.
If the app reports Dolby Digital 5.1 instead of Atmos, the issue is usually with the source app, TV model, or HDMI settings.
Common Problems and Fixes
Sonos Arc is not showing sound
Check that the HDMI cable is connected to the correct ARC/eARC port on the Roku TV.
Also verify that the TV’s audio output is set to external speakers rather than internal TV speakers.
No audio after switching inputs
Roku TV may need a refresh when moving between devices.
Power-cycle both the TV and Sonos Arc, then reopen the app or input you want to test.
Audio is out of sync
Use the Roku TV audio delay or lip-sync settings if available.
In some cases, restarting the TV and soundbar clears the mismatch.
Only stereo sound is playing
This often means the Roku TV is not passing multichannel audio.
Check the digital output format, the app’s audio settings, and whether the content itself supports surround sound.
Volume controls do not work correctly
Ensure HDMI-CEC is enabled on the Roku TV.
On many Roku TV models, CEC allows the TV remote to control the Sonos Arc volume.
How to Improve Reliability Over Time
Once the connection is working, a few maintenance habits help prevent future issues.
Keep firmware current, avoid unnecessary HDMI adapters, and use a certified high-speed HDMI cable to reduce handshake problems.
- Check for Roku TV system updates regularly.
- Update Sonos Arc firmware through the Sonos app.
- Keep the soundbar directly connected to the TV, not through an HDMI switch unless it supports ARC/eARC properly.
- Reboot the TV and soundbar after major system updates.
For larger Sonos home audio systems, you can later add rear speakers or a Sonos Sub to build on the Arc setup.
The base connection to Roku TV stays the same, which makes expansion easy once the core setup is stable.
When to Use an Optical Adapter Instead
HDMI ARC or eARC is the preferred method, but older TVs may not have a compatible port.
In that case, the Sonos Optical Audio Adapter can be used with the Sonos Arc if your TV has an optical output.
Optical works for basic audio and many surround formats, but it does not support the same bandwidth as eARC.
That means Dolby Atmos support is limited or unavailable depending on the source and TV hardware.
Quick Setup Checklist
- Connect Sonos Arc to the Roku TV’s HDMI ARC/eARC port.
- Set the Roku TV audio output to external speakers or HDMI ARC.
- Enable passthrough or auto audio format if available.
- Complete setup in the Sonos app.
- Test a known movie or show with surround sound.
- Confirm volume and lip-sync behavior with the Roku remote.
If the setup looks correct but the sound is still not right, the issue is usually in the Roku TV audio menu, not the hardware connection.
Rechecking the ARC/eARC port and passthrough setting usually resolves the most common problems.