Sonos Arc Ultra No Sound: TV & HDMI Fixes

If your Sonos Arc Ultra produces no sound, the problem is almost always in the TV’s audio output settings or the HDMI connection between the TV and the soundbar. This guide walks you through the most common causes and the exact steps to restore audio, starting with the quickest checks and moving to deeper troubleshooting.

First Checks: Power and Cables

Before changing any settings, confirm the basics. The Arc Ultra needs power, and its HDMI cable must be plugged into the TV’s eARC/ARC port—not just any HDMI input. Most TVs label this port clearly, but if yours doesn’t, check the manual or the TV’s on-screen settings (usually under “Sound� or “Audio�).

• Unplug the Arc Ultra’s power cord for 30 seconds, then plug it back in. This resets the internal processor.
• Inspect the HDMI cable for visible damage. A bent or broken pin is a common cause of intermittent audio.
• Try a different HDMI cable. Even if the cable looks fine, a faulty one can carry video but not audio.
• If you’re using an HDMI switch or adapter, remove it and connect the soundbar directly to the TV.

After reconnecting, check the Sonos app: the Arc Ultra should appear as “Connected.� If it shows “Not Connected,� the issue is with the network or the soundbar itself, not the TV.

TV Audio Output Settings

The most frequent cause of “no sound� is a TV that is set to output audio through its own speakers or through an incompatible format. The Arc Ultra requires the TV to send audio over HDMI, and that audio must be in a format the soundbar can decode.

1. Open your TV’s Settings menu and find Sound or Audio Output.
2. Set the output to HDMI ARC (or eARC). If you see an option for “Internal TV Speaker + HDMI,� choose only HDMI.
3. Look for a setting called Digital Audio Out, Audio Format, or Dolby. Set it to PCM or Bitstream—but not “Dolby Digital Plus� or “Dolby Atmos� if those options are causing issues. Start with PCM, which is the most universally compatible, then switch to Bitstream if you want surround sound.
4. If your TV has a eARC mode, enable it. This allows higher-bandwidth audio like Dolby Atmos.

After changing these settings, play a video and check if sound comes out. If not, try a different app or source (like a Blu-ray player) to rule out a streaming app issue.

HDMI-CEC and ARC Handshake

HDMI-CEC (Consumer Electronics Control) is the protocol that lets devices talk to each other over HDMI. It’s what allows the TV remote to control the soundbar’s volume. Sometimes, the handshake between the TV and the Arc Ultra fails, and no audio is sent.

• In the TV’s settings, find HDMI-CEC (often called “Anynet+,â€� “Bravia Sync,â€� or “Simplinkâ€� depending on the brand) and turn it off.
• Power off the TV and the soundbar, wait 10 seconds, then power them back on.
• Turn HDMI-CEC back on. This often forces a fresh handshake.
• If the problem persists, try a different HDMI port on the TV that supports ARC/eARC. Some TVs have only one such port.

Another trick: unplug the TV from power for 60 seconds. This clears the TV’s internal state and can resolve a stuck handshake.

Sonos App and System Settings

The Sonos app itself has settings that can affect audio output. If the soundbar is detected but silent, check these:

1. Open the Sonos app and go to Settings > System > Arc Ultra.
2. Look for TV Input or Audio settings. Ensure the “TV Autoplay� option is enabled if you want the soundbar to automatically play TV audio when you turn on the TV.
3. Check the Volume Limit—it might be set to zero. Unlikely, but possible.
4. In the app, go to Settings > System > About and verify the Arc Ultra’s software is up to date. If an update is pending, install it.

If the app shows the soundbar as “Not Set Up,� you may need to run the setup again. This is rare, but a network change can drop the soundbar from the system.

Common Misconceptions About eARC and Atmos

Many users think that enabling Dolby Atmos on the TV is necessary, but that’s not true. The Arc Ultra will play standard Dolby Digital 5.1 without Atmos. The “no sound� issue often occurs when the TV is set to output a format the soundbar can’t handle, like DTS (which the Arc Ultra does not support). If your TV has a “DTS� option, switch it to “Dolby Digital� or “PCM.�

Another misconception: that the HDMI cable must be “eARC certified.� In reality, any high-speed HDMI cable with Ethernet (usually marked “High Speed� or “Premium High Speed�) can carry eARC audio. The cable you got with the Arc Ultra is fine. The problem is more likely a TV setting than the cable.

Advanced Troubleshooting: TV Models and Firmware

If you’ve tried everything above and still have no sound, the issue may be a TV firmware bug. Check for TV software updates in the TV’s settings menu. Manufacturers occasionally release fixes for ARC/eARC audio dropouts.

Also, some TVs have a “Digital Audio Out� setting that defaults to “Auto.� This can cause the TV to send a format the Arc Ultra doesn’t recognize. Try setting it to “PCM� or “Bitstream� manually.

If you’re using a TV from 2019 or earlier, it may not support eARC. In that case, the Arc Ultra will still work with regular ARC, but you won’t get Dolby Atmos from most streaming apps (which require eARC). You’ll still get standard 5.1 surround, so don’t worry about “losing� sound—it just won’t be Atmos.

When to Contact Support

If you’ve gone through all the steps and the soundbar still produces no sound, the problem could be a hardware fault. Contact Sonos support or the retailer where you bought the soundbar. Before you do, note the TV model, the HDMI port used, and the exact settings you changed. This information will help them diagnose the issue faster.

Also, test the soundbar with a different TV if possible. If it works on another TV, the problem is with your original TV, not the soundbar.

Frequently Asked Questions

Why does my Sonos Arc Ultra work with some apps but not others?

This usually means the TV is set to “Auto� audio format. Some apps (like Netflix) send Dolby Digital Plus, while others (like YouTube) send PCM. If the TV’s auto detection fails, it might not switch formats correctly. Set the TV’s digital audio out to “PCM� to fix this, though you may lose surround sound on some apps.

Can I use a regular HDMI cable for the Arc Ultra?

Yes, any HDMI cable that supports Ethernet (most do) will work for ARC. For eARC, you need a cable that supports 48Gbps bandwidth (like “Ultra High Speed�), but the cable included with the Arc Ultra is sufficient. If you’re using an older cable, try a newer one.

Why does the Arc Ultra’s LED blink but no sound comes out?

Blinking usually indicates the soundbar is receiving a signal but can’t decode it. Check the TV’s audio format setting—it’s likely set to a format the soundbar doesn’t support, like DTS. Change it to PCM or Dolby Digital.

Does the Arc Ultra support DTS?

No, Sonos products do not support DTS. If your TV is set to output DTS, you’ll get no sound. Change the TV’s audio output to Dolby Digital or PCM.

My TV has no eARC port. Can I still use the Arc Ultra?

Yes, the Arc Ultra works with regular ARC. You’ll get standard 5.1 surround sound, but not Dolby Atmos from most streaming apps. For Atmos from a Blu-ray player, you’d need eARC.

Why does the sound cut out after a few minutes?

This is often a handshake issue. Try turning off HDMI-CEC on the TV and soundbar, then turning it back on. Also, check for TV firmware updates, as this is a known fix for intermittent audio dropouts.

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