Why Is My Sonos Arc Not Producing Surround Sound?
- TV audio output settings (PCM vs Bitstream)
- Content is not surround sound compatible
- Incorrect HDMI ARC/eARC connection
Problem Description
Your Sonos Arc soundbar is failing to produce surround sound or Dolby Atmos effects, resulting in a less immersive audio experience. This can be due to TV settings, content limitations, or incorrect Sonos setup.
Symptoms
- Audio sounds like stereo, not surround
- No overhead or side effects
- Sonos app shows "Stereo PCM" instead of Dolby Atmos
- Specific movies/shows lack surround sound
- Happens after TV settings change
- Other Sonos features work fine
Recognize these? Here's what usually causes it.
Common Causes
- TV audio output settings (PCM vs Bitstream)
- Content is not surround sound compatible
- Incorrect HDMI ARC/eARC connection
- Outdated TV or Sonos firmware
- Trueplay tuning issues
- External device audio settings
Most fixes happen in the first 3 steps.
If you are using external devices (e.g., game consoles, streaming boxes) connected directly to your TV, ensure their audio output settings are also configured for Bitstream or Dolby Digital/Atmos, not PCM.
Tools & Requirements
These tools will help you complete this fix.
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Step-by-Step Solution
Adjust TV Audio Output Settings
Access your TV"s audio settings menu. Ensure the audio output format is set to "Bitstream", "Dolby Digital", "Dolby Digital Plus", or "Passthrough" instead of "PCM" or "Stereo". For Dolby Atmos, ensure your TV"s HDMI eARC port is enabled and set to "Passthrough" or "Auto".
Needed for this step
Certified HDMI 2.1 Cable 6FT, 8K HDMI eARC Cord...
$9.90Verify Content is Surround Sound Compatible
Not all movies, TV shows, or streaming services offer surround sound or Dolby Atmos. Ensure the content you are playing explicitly states it supports these formats. Check the audio settings within the streaming app or Blu-ray player.
Check HDMI ARC/eARC Connection
Ensure your Sonos Arc is connected to your TV"s dedicated HDMI ARC (Audio Return Channel) or eARC port. This port is usually labeled and is essential for transmitting high-quality audio formats like Dolby Atmos. Disconnect and reconnect the HDMI cable firmly.
Update TV and Sonos Firmware
Ensure both your TV and your Sonos Arc have the latest firmware. Outdated firmware on either device can cause compatibility issues with surround sound formats. Check your TV"s settings for software updates and your Sonos app (Settings > System > System Updates) for Arc firmware.
Re-run Trueplay Tuning
After verifying all connections and settings, re-run Trueplay tuning in the Sonos app (Settings > System > Trueplay). Trueplay calibrates the Arc to your room"s acoustics, optimizing the soundstage and surround effects for your specific environment.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If this comes back after following these steps, check whether a recent app or firmware update reset a default setting — the fix works, but the setting gets reverted silently.
For the best Dolby Atmos experience, ensure your TV supports HDMI eARC. If your TV only has HDMI ARC, you may be limited to Dolby Digital Plus, which still provides excellent surround sound.
This issue almost always looks more complex than it is — the majority of cases trace back to a single setting, a stale credential, or a default that shipped wrong.
- TV audio output settings (PCM vs Bitstream)
- Content is not surround sound compatible
- Incorrect HDMI ARC/eARC connection
- Outdated TV or Sonos firmware
- Trueplay tuning issues
Before you go — try one of these (they fix most cases).
Most popular upgrades chosen by Sonos Arc owners.
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Official Manufacturer Manual
Sonos provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Sonos Arc.
Source: sonos.com
Need More Help? Sonos Support
Note: The contact information below connects you directly to Sonos's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
