Count the sources of sound
Listen close enough to identify whether the TV and soundbar are both producing programme audio. Do not change several delay settings merely because speech sounds doubled. A small difference between two paths can create a clear echo even when each path alone is intelligible.
LG documents this simultaneous-output scenario and provides output-selection and PCM comparisons, with model-specific controls.
Make the simplest comparison
Use the TV's supported Sound out controls to select one intended route. Play the same spoken passage at a comfortable level. If the doubling disappears, you have evidence about the interaction between routes. It does not prove either speaker is defective.
Check the final equipment's own volume. Turning one device down can hide the second route without making the configuration clear, so record the selected output as well.
Treat processing choices as tradeoffs
If the household requires simultaneous outputs, consult the model-specific instructions and compare the documented audio format or timing controls. A PCM comparison may alter channel layout or processing, so judge more than the disappearance of a front-panel badge.
A global timing change can affect other sources. Keep the original values and test the ordinary route after the experiment rather than leaving an unexplained offset for the next viewer.
Separate echo from lip-sync
A single audible voice arriving late relative to visible speech is not the same as two voices arriving separately. Describe which observation remains after selecting one output. That distinction helps the TV or soundbar support team choose the relevant controls.
Include the connection types, selected outputs and reference item. This explanation follows LG's documented scenario; it does not guarantee that a particular Bluetooth or HDMI combination can be perfectly aligned, and no audio system was measured here.
Use the listener's normal position
A comparison made beside one speaker can disguise the timing relationship heard from the seating position. Test where the programme is normally watched, keeping the same volume and reference passage. If echo remains through one selected route, stop treating it as a two-output finding and report the remaining sound character. Do not keep compensating a single path for an interaction that is no longer present.
Sources and scope
Scope notes distinguish published documentation, supplied information and editorial methods. They do not report a hands-on service test.
- LG simultaneous-speaker echo — Official support excerpt: processing delay and single-output/PCM comparisons.
- LG webOS24 sound output — Official article section inspected: All Settings, Sound, Sound out and wired/wireless choices; other models may differ.
