KEF Soundbar No Sound: HDMI eARC & TV Settings

If your KEF soundbar produces no sound, the fix is almost always in the HDMI eARC handshake or the TV’s audio output settings. Check that the soundbar is connected to the eARC-labeled HDMI port, then set the TV’s audio output to “eARC” or “ARC” and disable any internal TV speakers. Below are the exact steps, common pitfalls, and settings to verify.

Why eARC Is the Usual Culprit

KEF soundbars (like the LS50 Wireless II or the R Series) rely on HDMI eARC to receive high-quality audio from your TV. eARC (enhanced Audio Return Channel) sends audio from the TV’s apps or connected devices back to the soundbar over the same HDMI cable. If any link in that chain is broken—wrong port, outdated firmware, or a misconfigured TV setting—the result is silence.

The most common mistake is plugging the soundbar into a regular HDMI port instead of the one labeled “eARC” or “ARC.” On many TVs, only one port supports this feature, and it is often marked with a small label or a different color. If you are using the wrong port, the TV simply does not send audio to the soundbar.

Step-by-Step: Restore Sound via HDMI eARC

Verify the physical connection. Use a high-speed HDMI cable (18 Gbps or higher) and plug it into the port on the TV labeled “eARC” or “ARC.” On the soundbar, use the port marked “eARC” or “HDMI Out.”
Check the TV’s audio output settings. Go to Settings → Sound → Audio Output and select “eARC” or “ARC.” If you see a toggle for “eARC” (sometimes called “HDMI ARC” or “Digital Audio Out”), make sure it is On.
Disable the TV’s internal speakers. In the same audio menu, set “Speaker” or “Audio Output” to “External Speaker” or “Audio System.” If the TV still plays through its own speakers, the soundbar may be receiving no signal at all.
Set the digital audio format. In the TV’s audio settings, choose “Bitstream” or “Pass-through” rather than “PCM” if you want Dolby Atmos or DTS. Some TVs default to “Auto,” which can cause handshake issues—try switching to “Bitstream” and then back to “Auto” to force a renegotiation.
Power-cycle everything. Turn off the TV and the soundbar, unplug both from power for 30 seconds, then plug them back in and turn them on. This resets the HDMI handshake, which is a common fix for intermittent or missing audio.
Update firmware. Check both your TV and the KEF soundbar for firmware updates. KEF releases updates that improve eARC compatibility with specific TV brands, so this step matters more than most people think.

TV App Settings That Mute the Soundbar

If you are using a built-in app (Netflix, YouTube, etc.) and get no sound, the problem may be inside the app itself. Many streaming apps have their own audio output settings that can override the TV’s global settings.

Check the app’s audio settings. For example, Netflix has a “Audio” submenu where you can select “Auto,” “English 5.1,” or “Stereo.” If it is set to a format the soundbar does not support, you may get silence.
Try a different app. If YouTube works but Netflix does not, the issue is app-specific, not the soundbar.
Disable “Audio Processing” or “Sound Enhancement.” Some TV apps apply their own equalizer or virtual surround, which can conflict with the soundbar’s processing. Turn these off in the app’s settings if available.
Restart the app. Force-close the app and reopen it. This often re-establishes the audio stream.

TV-Specific Settings That Break eARC

Different TV brands have quirks that can mute a KEF soundbar:

Sony TVs: Look for “eARC Mode” under Settings → Display & Sound → Audio Output. Set it to “Auto.” Also disable “A/V Sync” if you get audio lag, but for no sound, ensure “Pass Through Mode” is set to “Auto.”
LG TVs: Go to Settings → Sound → Advanced Settings → eARC. Toggle it on. Also set “Digital Sound Out” to “Pass Through” or “Auto.”
Samsung TVs: Navigate to Settings → Sound → Expert Settings → eARC Mode. Enable it. Also set “Digital Output Audio Format” to “Pass-Through.”
Vizio TVs: Look for “Audio Output” under Settings → Audio. Select “Digital” and ensure “eARC” is enabled if present.

If you have a receiver or other device between the TV and soundbar, remove it temporarily. A faulty HDMI switch or an older receiver that does not support eARC will block audio entirely.

When to Use Optical Instead of eARC

If eARC continues to fail, a digital optical cable (TOSLINK) is a reliable fallback. It carries 5.1-channel Dolby Digital and DTS, though not Dolby Atmos or other object-based formats. To use it:

Connect an optical cable from the TV’s “Digital Audio Out (Optical)” to the soundbar’s “Optical In” port.
In the TV’s audio settings, change the output from “eARC” to “Optical” or “Digital Audio Out.”
Set the digital audio format to “Bitstream” or “Dolby Digital” (not PCM) to get surround sound.

This is a common workaround for older TVs or stubborn handshake issues. You lose Atmos, but you regain audio reliably.

Common Misconception: The Soundbar Is Broken

Many users assume the soundbar’s hardware has failed when they hear nothing. In reality, the vast majority of no-sound cases are software or configuration issues. Before considering a repair, try these quick tests:

Play music via Bluetooth or a direct HDMI input (e.g., a Blu-ray player) to confirm the soundbar itself works.
Plug a pair of headphones into the TV’s headphone jack—if you hear sound, the TV is outputting audio, so the problem is in the eARC path.
Try a different HDMI cable, even if the current one looks fine. High-speed cables are cheap and often the culprit.

If the soundbar works with other sources, the issue is definitely in the TV’s eARC configuration, not the hardware.

Frequently Asked Questions

Why does my KEF soundbar work with Bluetooth but not with the TV?

Bluetooth bypasses the TV entirely, so the soundbar receives audio directly from your phone. When connected via eARC, the TV must send audio through the HDMI link. If the TV’s eARC output is not enabled or the port is wrong, you get silence. Check the TV’s audio output settings and the HDMI port label.

Do I need a special HDMI cable for eARC?

Yes, you need a high-speed HDMI cable with Ethernet (18 Gbps or more). Standard HDMI cables from older devices may not carry eARC’s data. Look for cables labeled “High Speed” or “Ultra High Speed” with the HDMI logo. If in doubt, try a new cable—it is the cheapest fix.

Why does the soundbar work for a while then go silent?

This is typically a handshake issue. The TV and soundbar lose their HDMI connection, often when switching apps or changing video resolution. Power-cycling both devices usually restores it. If it happens frequently, update firmware on both devices and try a different HDMI port.

Can I use both the TV speakers and the soundbar at the same time?

Most TVs do not allow simultaneous output through eARC and internal speakers. You must select one or the other in the audio settings. If you want both, you would need to use a separate audio splitter, which is uncommon and not recommended because it can cause sync issues.

What is the difference between ARC and eARC?

ARC (Audio Return Channel) supports compressed 5.1 audio like Dolby Digital. eARC (enhanced ARC) supports higher-bandwidth formats like Dolby Atmos and DTS:X, and it has better lip-sync correction. If your TV only has ARC, you will still get sound, but not the full object-based audio. Check your TV’s manual to see which it supports.

Why does my soundbar show “NO SIGNAL” on its display?

This usually means the soundbar is not receiving any audio data from the TV. It can happen if the TV is set to output audio to its internal speakers, if the HDMI cable is faulty, or if the TV’s eARC port is not active. Recheck the port, cable, and TV audio output settings.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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