If the same sound plays from both the TV speaker and an external audio device at the same time, a processing delay difference can cause an “echo” effect.
To reduce the echo, set the TV to use only one sound output.When the same sound is output through both the TV speaker and an external speaker at the same time, the processing delay can be different for each output path.
That timing mismatch can make the sound feel doubled or echo-like.
Also, if Digital Sound Output is set to Auto, extra signal processing before sending audio to the external device can add delay and make the echo more noticeable.
When Digital Sound Output is set to “Auto,” the TV may process the audio signal and then send it to the external device, which can add delay.
If the TV speaker is also playing at the same time, the external speaker may sound slightly late, which can feel like an echo.
If a setting that plays audio through both the TV speaker and an external speaker is enabled, the two outputs can interfere with each other or fall out of sync.
This can cause echo or reverberation.
First, select only one sound output so the TV speaker and the external speaker are not playing at the same time.
If you still hear echo, change Digital Sound Output to PCM and adjust the soundbar’s AV Sync (lip sync) to see if it improves.
Press the Settings button on the remote to open the All Settings menu.
Go to Sound, then open Advanced Settings.
Set Digital Sound Output to PCM.
If PCM cannot be selected due to your connection type or the content you are playing, keep the current setting and continue to the next step.
Press the Settings button on the remote to open the All Settings menu.
Go to Sound and select Sound Out.
Choose only one option, such as HDMI ARC Device, Optical, Bluetooth, or TV Speaker.
If the echo happens when the TV speaker and an external device are both on, switch to a single output to remove the timing difference.
Press the AV Sync (or Lip Sync) button on the soundbar remote.
Check the sync value shown on the soundbar display.
Use the left/right buttons (or similar) to adjust the value until the echo or delay is reduced.
If supported, you can also adjust sync in the soundbar’s dedicated app.
If both outputs are active at the same time, the same sound can arrive at different times and be heard as an echo.
If a small delay remains, adjust the soundbar AV Sync, and if needed, change Digital Sound Output to PCM.
If the steps above did not resolve your issue, please visit the LG Electronics Support website. You can chat with our virtual assistant or schedule a service repair for further assistance.
※ Please note that service fees may apply for engineer visits if your product is out of warranty.
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