Key takeaways
- Doubled or echoed dialogue almost always means the TV's internal speakers were never actually switched off, not a soundbar fault.
- A software update on the TV can silently reset the speaker output setting back to on, so check it again after every update.
- HDMI-CEC has to be enabled on both the TV and the soundbar for the automatic switch-over to happen at all.
- A fault that appears in only one streaming app points to that app's own audio settings, not the system-wide configuration.
- If every setting checks out clean and the fault is still consistent, it is worth a support call quoting both exact model numbers rather than more guessing.
The complaint is always the same: dialogue sounds doubled, slightly echoed, as if two people are speaking a fraction of a second apart. That is exactly what is happening. The TV’s own speakers and the soundbar are both playing the same audio at once, usually just after a software update or a change of input.
The fix is almost always in the TV’s settings, not the soundbar’s, which surprises most people since the soundbar is the newer, more complicated-looking device. Work through these causes in order, most common first, the same way you would run any structured troubleshooting pass, and test each one before moving to the next.
I have been called out for this exact complaint more times than almost any other single fault, on Samsung, LG, and Sony televisions alike, and in nearly every case the soundbar itself was working correctly the entire time. The TV was the device doing something wrong, quietly, in a menu nobody thinks to check twice.
The TV speaker setting was never actually turned off
Nearly every television ships with internal speakers active by default, and connecting a soundbar over HDMI ARC or eARC does not automatically disable them on every model. Some do it automatically, many do not, and a software update can silently reset the setting back to on.
Check the TV’s sound output menu, not the soundbar’s, for a setting usually named Speaker List, Sound Output, or TV Speaker, and confirm it is set to external, soundbar, or receiver only rather than both. This single setting accounts for the large majority of both-are-playing calls I get.
Some TVs additionally offer a partial option, TV speakers active only when no external device is connected, which is the correct setting for most households and should not need touching again once set. If yours shows both TV and external speakers as simultaneously active in that menu, that is the setting to change, not anything on the soundbar itself.
An audible doubling effect appears once the delay between the two sources passes roughly 20 to 30 milliseconds, which is why this fault sounds like an echo rather than simply louder or fuller audio. Distance and processing differences between the two speaker paths are almost always enough to cross that threshold.
The audio output source does not match the physical connection
If the TV is set to send audio out over optical while the soundbar is actually connected through HDMI ARC, or the reverse, the TV can fall back to its internal speakers because it believes nothing is receiving the signal on the selected output. Check the TV’s audio output settings match the cable actually in use.
This is common after swapping cables during a setup change, connecting a new soundbar over HDMI eARC for the first time without updating the output selection left over from a previous optical connection. Confirm the setting explicitly rather than assuming the TV detected the change on its own.
On a receiver-based system rather than a simple soundbar, check the input assignment too, since a Denon AVR-X1800H can be correctly set to accept HDMI while the TV is still sending its main audio out over optical from a previous configuration. Both ends need to agree on the same physical path before either will behave.
The eARC handshake has not fully completed
ARC and eARC require a brief digital handshake between TV and soundbar every time either device restarts, as defined in the HDMI 2.1 specification, and an incomplete handshake can leave the TV defaulting to its internal speakers as a fallback while still sending some audio out to the bar. The result is exactly the doubled sound described above.
Unplug both the TV and soundbar for 30 seconds, then power the TV on first and the soundbar second, giving each device time to fully boot before the next. This forces a fresh handshake and resolves a stuck connection more often than reopening any settings menu.
Some TVs additionally need their eARC-designated HDMI port specifically, rather than any HDMI input, to complete this handshake correctly. Using the wrong port produces a connection that looks active but never quite finishes negotiating, which again defaults back to the internal speakers as a fallback.
HDMI-CEC is switched off, so nothing changes automatically
HDMI-CEC, sold under different brand names, Samsung’s Anynet+, LG’s SimpLink, Sony’s Bravia Sync, is what lets the TV automatically switch its audio output when it detects a connected soundbar. With CEC disabled, that automatic handover never happens, and both outputs can stay active by default.
Turn CEC on in both the TV and soundbar’s settings menus, confirm they are using the same naming convention if the brands differ, and power cycle both devices afterward. Getting CEC working properly across mismatched brands is worth doing once rather than working around it every time you turn the system on.
A mismatch between brands is the most common reason CEC fails to link two devices even with both settings switched on: a television’s CEC implementation sometimes disagrees subtly with a soundbar from a different manufacturer, and a firmware update on either side occasionally resolves it without any setting changing at all.
A streaming app is overriding the system audio setting
Some smart TV apps, particularly certain live TV and sports apps, set their own audio output preference independent of the system-wide setting, and can revert to the TV’s internal speakers when opened even though every other app respects your soundbar setting correctly. This shows up as the fault appearing in one app only.
Test by switching between two or three different apps at the same volume and content type. If the doubling appears only in one specific app, that app’s own audio settings, not your system configuration, need adjusting, and updating the app is often the actual fix.
This is worth ruling out before assuming a hardware fault, since it accounts for a meaningful share of the cases where every other test above comes back clean. An app behaving differently from every other app on the same TV is a strong signal pointing at the app itself, not the television or the soundbar.
A remote or voice command switched it back without anyone noticing
A universal remote sending the wrong device code, a voice assistant command like turn on TV speakers issued by mistake, or a household member pressing an unfamiliar button can toggle the TV speaker setting back on without anyone realising what changed. This is common in households with more than one person operating the system.
If the fault appears and disappears with no pattern related to updates or app use, ask whoever else uses the system whether anything was pressed, and check the TV speaker setting again since it may simply have been switched back rather than reset by software.
What it means if none of these were the cause
If the TV speaker setting is confirmed off, the output source matches the cable, the handshake has been refreshed, CEC is on, every app behaves consistently, and no one changed a setting, the fault is unusual enough to suggest a firmware bug on either device rather than a configuration issue. Checking whether a firmware update addresses your specific TV model is the next reasonable step, since manufacturers do occasionally patch exactly this kind of handshake bug. The same doubled timing also explains why this fault feels related to, but is not the same problem as, fixing lip sync delay, where picture and sound drift apart rather than two sources playing at once.
Confirm the pattern is consistent, not intermittent, before assuming it is a bug rather than a setting: use the same input, same app, and same volume across three separate tests. A fault this specific and this reproducible is worth a support call with the TV manufacturer, quoting the exact model numbers of both the TV and the soundbar, rather than more guessing at settings that have already checked out clean.
Work through the list above in order rather than jumping straight to the last item. Most of these checks take under two minutes each, and ruling out the common causes properly is faster, in total, than guessing at the rare one and being wrong twice.
Questions readers ask about this
Because both are playing the same audio at once, with a small delay between them, typically once the gap passes about 20 to 30 milliseconds. The fix is almost always in the TV's own speaker setting rather than anything on the soundbar, since most TVs ship with internal speakers active by default.
Software updates occasionally reset audio settings to their factory default, which for most TVs means internal speakers active alongside any external output. Check the TV's sound output menu after every firmware or software update rather than assuming your soundbar setting survived it.
No, audio will pass over ARC or eARC with CEC off, but the automatic switch-over that mutes the TV's internal speakers when a soundbar is detected depends on CEC being enabled on both devices. Without it, that handover has to be done manually every time.
Because some apps set their own audio output preference independent of the TV's system-wide setting, which is a bug or design choice specific to that app rather than your configuration. Updating the app, or checking its own internal audio settings, is usually the actual fix.
It is possible but uncommon. In the large majority of cases the soundbar is correctly receiving and playing audio, and the TV is the device incorrectly also playing through its own speakers. Confirm this by muting the TV directly. If the soundbar keeps playing normally, the TV's own settings are the issue.
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.
