Optical vs HDMI ARC for soundbars: which should you use?

If your soundbar suddenly stopped sending sound over eARC or ARC from built-in TV apps, you're not the only one dealing with this. HDMI-CEC, eARC, and app updates all interact in strange ways, so a small change in one place can mute the whole setup. This guide walks you through a clean, methodical reset so you can get reliable sound again without guessing.

Quick answer

• Power cycle everything: Unplug TV and soundbar for 30-60 seconds, disconnect HDMI cable during power-off • Use correct ports: HDMI cable must go to TV's ARC/eARC port and soundbar's ARC input • Reset HDMI-CEC: Turn HDMI-CEC off and back on in both TV and soundbar settings • Check audio format: Try "Auto" or "Dolby Digital" instead of PCM-only output

Symptoms

• Soundbar shows "TV Audio" but produces no sound or intermittent audio • Built-in TV apps have no audio, but external devices work fine • Sound cuts out randomly when using Netflix, YouTube, or other streaming apps • Soundbar display doesn't show Dolby Digital, Dolby Atmos, or PCM indicators

Quick checks

Confirm the HDMI connection — Make sure the HDMI cable from the TV is plugged into the ARC or eARC-labeled HDMI input on your soundbar. On many sets it is only one specific port.

Use a certified high-speed cable — Old or damaged HDMI cables are a very common cause of eARC drop-outs. Swap in a known-good, certified cable if you have one.

Set TV audio to eARC/ARC — In the TV sound settings, select the option that sends audio to an external receiver or soundbar rather than the TV speakers.

Turn the volume up on the soundbar — It sounds obvious, but if the receiver was muted or set to a different input, you will not hear anything from TV apps.

Step-by-step fix

1. Power everything off fully — Turn off the TV and the soundbar, then unplug them from power for 30-60 seconds. This clears the HDMI control state.

2. Unplug the HDMI cable during the power off — Disconnect the cable between the TV eARC/ARC port and the soundbar. Waiting a few seconds helps the devices forget the old link.

3. Plug the HDMI cable back in firmly — Re-connect the cable to the eARC/ARC port on the TV and the ARC-enabled input on the soundbar. Avoid adapters or wall plates for this test.

4. Power on the TV first, then the soundbar — Let the TV boot to the home screen before turning on the receiver. Many HDMI-CEC systems are picky about power-on order.

5. Open a simple TV app and test — Launch a built-in app like Netflix or YouTube and play a video. Give it a few seconds to negotiate audio. Watch the front panel of the soundbar for Dolby Digital, Dolby Atmos, or PCM indicators.

6. Toggle HDMI-CEC / ARC off and on — In both the TV and soundbar menus, temporarily disable HDMI-CEC and ARC/eARC, then turn them back on. This often forces a fresh handshake.

7. Match audio formats — Some models are picky about multichannel PCM or Dolby Atmos. If you get silence, try forcing the TV to output Dolby Digital or "Auto" instead of PCM only.

8. Test with multiple apps — Try at least two or three streaming apps. If only one app has no sound, open its internal audio or playback settings and confirm surround sound is enabled.

9. Disable Bluetooth audio temporarily — If the TV is paired with Bluetooth headphones or a speaker, it may route sound there instead of to eARC.

Expert tip: For stubborn eARC issues, temporarily disconnect all other HDMI devices from the TV and soundbar, then repeat the power-cycle and eARC setup. This strips the system down to one TV and one soundbar, making it easier to see whether a game console or streaming box was confusing HDMI-CEC.

If it still isn't working

Document the exact behavior: which TV model you have, which HDMI port is in use, what the soundbar display shows, and which apps fail. Support teams for soundbar and TV manufacturers can do much more with that detail than with "no sound from apps."

TV issue — If eARC works from external devices (like a streaming stick) but not from built-in apps, check for TV software updates.

Soundbar issue — If the soundbar never shows an ARC/eARC input or keeps dropping back to TV speakers, look for a firmware update and a setting that explicitly enables ARC on that HDMI input.

Cable issue — If sound cuts in and out, or only works after you wiggle the cable, replace the HDMI cable with a certified Ultra High Speed cable.

FAQ

Why does eARC work with my cable box but not Netflix? Built-in TV apps and external devices use different audio pathways. The TV's internal audio processing may have different format support or bugs that don't affect HDMI passthrough from external sources.

Should I use optical instead of HDMI ARC? HDMI ARC/eARC supports higher quality audio formats like Dolby Atmos and uncompressed multichannel, while optical is limited to compressed Dolby Digital. Stick with HDMI if possible.

Why do I have to keep resetting the connection? Firmware updates on either the TV or soundbar can change HDMI-CEC behavior. Some combinations are simply less stable than others, especially with frequent app switching.

Can a bad HDMI cable really cause intermittent audio? Yes. eARC requires more bandwidth than regular ARC, and marginal cables that work for video may fail for the two-way audio communication that eARC demands.