Key takeaways
- The single most common cause of a soundbar losing its own sound is the TV quietly reverting its output to internal speakers, usually after a firmware update or a brief HDMI-CEC handshake failure.
- Setting the TV's digital audio output to PCM instead of Bitstream or Passthrough strips the object-based metadata Dolby Atmos needs, even though the soundbar keeps producing ordinary stereo or 5.1 sound.
- A Fixed audio output setting sends a constant signal regardless of the TV remote, which gets mistaken for a broken soundbar far more often than it gets recognised as a menu mismatch.
- A downmix setting buried under the audio format menu can fold five or seven channels into two even when the output device and the Bitstream setting are both already correct.
- If all five settings check out and the fault continues, the problem has moved from the TV's menus to the cable, the port, or the handshake between the two devices.
The picture is fine. The remote works, the on-screen volume bar moves, and the soundbar’s own light is lit and paired correctly. What actually comes out of it, though, is thin, missing entirely, or leaking from the television’s own speakers instead of the five or seven drivers built into the bar.
Before assuming the soundbar itself has failed, it is worth working through the TV’s own audio settings in order, because in eleven years of installs I have found the fault sits there more often than in the hardware. The five causes below are ranked by how often each one turns out to be the actual answer, not by how serious they sound.
The TV is still routing sound to its own speakers
This is the single most common cause I see, and it rarely announces itself. A firmware update, a brief HDMI-CEC handshake failure after standby, or even a stray remote press can quietly flip the output back to the television’s internal speakers while the soundbar sits there powered on and connected correctly.
The test is simple. Open the TV’s sound settings and look for the field usually labelled Speaker, Sound Output, or Audio Output Device. It should name the soundbar, the AV receiver, or the port itself, ARC or eARC, rather than the built-in TV speaker option.
Samsung calls this menu Sound Output, LG calls it Sound Out, Sony buries it under Speakers. Whatever the label, if it points at the built-in speakers rather than an external device, that alone explains a soundbar producing nothing at all.
Digital output set to PCM instead of Bitstream or Passthrough
This is the second most common cause, and the one that causes the most confusion, because the soundbar still makes sound. It just is not the sound the disc or the streaming app actually sent.
PCM is what you get once the television has already finished decoding the track itself, stripped down to plain channels with no object placement data left inside. Bitstream, sometimes labelled Passthrough, skips that step and hands the soundbar the original encoded stream, metadata included, so the bar does the decoding instead of the TV.
A software update can silently reset this field back to PCM with no notice on screen. If Atmos worked last month and does not now, check this setting before blaming a cable or the soundbar itself.
The test: play a title known to carry Dolby Atmos and read the soundbar’s own front display or companion app, not the TV’s menu. It should show Dolby Atmos or Dolby Digital Plus. If it shows PCM Stereo or plain Dolby Digital, switch the TV’s digital audio output to Bitstream or Passthrough and test again. The full mechanics of why this single setting matters so much are covered in bitstream versus PCM, and which one to choose.
A flat I serviced last year had this exact fault for months. A scheduled update on the tenant’s TV had reset the digital output to PCM overnight, and every app from a streaming service to a 4K Blu-ray player suddenly played back as plain two-channel stereo. Flipping the field back to Bitstream took under a minute and fixed all of it at once.
Fixed volume output ignoring the TV remote
Some TVs offer a choice between Fixed and Variable for the digital audio output, usually sitting right next to the PCM or Bitstream field rather than in the main volume controls. Fixed sends audio at a constant level no matter what the remote does, which suits certain receiver setups and almost no soundbar.
The symptom is specific. The on-screen volume bar moves, but the soundbar’s own output does not change at all, or the sound sits uncomfortably loud regardless of how far down the remote goes. People often blame the soundbar’s remote pairing when the TV itself is simply refusing to pass volume changes through.
The test: press volume down on the TV remote and watch whether the soundbar responds within a second or two. If it does not, switch the output from Fixed to Variable and confirm HDMI-CEC is actually enabled, since CEC is what carries that remote command to the bar in the first place.
A downmix setting folding surround to two channels
This one hides deeper in the menu than the others, usually under a separate audio format or channel field rather than the main PCM or Bitstream toggle. Some TVs default to a stereo downmix for any PCM path, even with Bitstream selected elsewhere, which flattens a 5.1 or 7.1 mix into two channels before it ever reaches the bar.
The result sounds noticeably worse than honest stereo content played back straight. Dialogue moves oddly, effects crowd into the centre, and a soundbar with genuine surround or Atmos capability, something like a Samsung HW-Q990D or a Sony Bravia Theater Bar 9, ends up sounding like a far cheaper unit than it is.
The test: look for a separate downmix or channel output field, sometimes labelled Dolby Digital Output or Surround, and confirm it is not pinned to Stereo. Where the choice exists, Auto or Surround should be selected instead of a fixed two-channel mode.
A digital format mismatch between the TV and the soundbar
Less common, but worth checking before assuming a fault elsewhere. A handful of TVs let you manually pin the digital output to a single format, Dolby Digital only or DTS only, rather than leaving it on Auto. If a soundbar cannot decode whatever format the TV insists on sending, the result is silence or an unexpected fallback to stereo.
This shows up most with older or budget soundbars that only decode Dolby formats, paired with a source or app that happens to output DTS instead. Newer bars, and most AV receivers like a Denon AVR-X1800H, handle both without issue, which is part of why this cause ranks lowest on the list.
The test: switch the TV’s digital output format to Auto if that option exists, rather than a fixed single choice, and let the TV and soundbar negotiate the correct format per source themselves.
| Setting | Correct value | Symptom if wrong |
|---|---|---|
| Output device | Soundbar or receiver | No sound from the bar at all |
| Digital audio output | Bitstream or Passthrough | Atmos badge never appears, sound feels thinner |
| Volume output | Variable | Remote volume has no effect on the bar |
| Downmix or channel | Auto or Surround | Surround content sounds flat and centred |
| Digital format | Auto | Silence or fallback to stereo on some sources |
When the settings are all correct and the sound still is not right
If the output device, the PCM or Bitstream field, the volume mode, the downmix setting, and the format selection all check out, the fault has moved outside the TV’s menus entirely. That points to the physical connection instead: the port, the cable, or the handshake between the two devices.
Start with which port the soundbar is actually plugged into. Not every HDMI input carries audio return, and a soundbar connected to an ordinary HDMI IN port rather than the one marked ARC or eARC will never receive sound no matter how the settings above are configured, a mistake covered in full in clearing an HDMI handshake problem.
Sound that cuts in and out, rather than being simply absent or muffled, usually points to a timing fault rather than a format one, and dialogue drifting out of sync with the picture is a separate issue covered in fixing lip sync delay. Both are worth ruling out once every setting above is confirmed correct.
For a complete method that works through cabling, ports, and pairing once the settings are cleared, a working troubleshooting method for soundbars picks up exactly where this list leaves off.
- Output device set to the soundbar or receiver, not the TV speaker
- Digital audio output set to Bitstream or Passthrough, not PCM
- Volume output set to Variable, not Fixed
- Downmix or channel setting not pinned to Stereo
- Digital format set to Auto rather than a single fixed format
Questions readers ask about this
Almost always the TV's output device setting has quietly reverted to its internal speakers, often after a firmware update or a brief HDMI-CEC handshake failure around standby. Open the TV's sound settings and check the field labelled Speaker, Sound Output, or Audio Output Device, and confirm it still names the soundbar or the correct port rather than the TV itself.
Yes. Several manufacturers have shipped updates that reset the digital output to PCM, or the output device back to the TV's own speakers, with no on-screen warning at all. It is worth rechecking both fields after any software update, especially if sound that worked yesterday has changed without you touching a single menu.
This usually means the digital audio output is set to Fixed rather than Variable, which sends a constant signal regardless of what the remote does, or that HDMI-CEC is disabled somewhere in the chain. Switching to Variable and confirming CEC is enabled on both the TV and the soundbar resolves it in most homes.
No, and that is exactly why this list ranks five separate fields rather than pointing at one. Output device, digital format, volume mode, downmix, and format selection each fail independently, so a soundbar can lose Atmos from one setting while a completely different setting mutes it entirely.
Sometimes, but only because a factory reset happens to restore a setting that had drifted wrong, and it just as often reintroduces PCM or the TV's internal speakers as the default output. Checking the five specific fields in this list is a faster and more reliable fix than a full reset.
About the author
Rahul Gupta
Rahul Gupta has spent nearly a decade quietly wiring living rooms, testing soundbars in every awkward apartment layout imaginable, and untangling the kind of HDMI handshake problems that make people give up on Atmos altogether. He writes here about what actually works when you get the boxes home—not what the spec sheet promises. If a piece of gear on this site earns a recommendation, it earned it in a real room with real furniture, not a lab.
