Why your soundbar audio delay happens and how to fix it

Why the sound and picture drift apart

An out-of-sync soundtrack is one of the more irritating problems in home entertainment. Engadget has published a guide to why soundbar audio delay happens and what viewers can do about it. The problem is easy to spot: characters' lips move after the words arrive, or a sports commentator calls the winning goal moments before the play appears on screen.

The guide explains that the delay usually comes from how a television and a soundbar divide their work. When a TV uses only its own speakers, it finishes processing both the picture and the sound before sending either out, so the two stay matched. Add a soundbar and the tasks split: the TV decodes the video while the soundbar decodes the audio. If those two processes finish at slightly different speeds, even by a fraction of a second, the sound lags behind the picture.

Other equipment can add to the lag. Engadget lists streaming devices, games consoles and weak Wi-Fi or Bluetooth connections among the possible contributors.

Finding the source of the delay

Before changing any settings, the guide suggests working out where the fault lies. One test is to switch sources: if a Blu-ray player plays in sync but a cable broadcast or streaming service does not, the problem probably sits with that broadcast or service rather than with the hardware.

If the delay appears no matter what is playing, the TV, the soundbar or both are likely responsible. Engadget recommends starting with the physical connection, because a loose digital optical or HDMI cable is a common and easily overlooked cause. Tightening the cable, or replacing it, is worth trying first.

Soundbar settings that restore sync

Many soundbars include their own sync controls. On Samsung models, Engadget notes, the remote's Sound Control button can shift the audio until it lines up, and some remotes carry a dedicated Audio Sync button that works with the skip forward and back keys. An Audio Sync plus and minus feature offers further adjustment.

LG soundbars offer an AV Sync setting for the same purpose. Sonos owners can open the Sonos app, select their soundbar, go to the Home Theater section and use the TV Dialog Sync slider until the sound matches the picture.

Bypassing the TV with direct routing

Another option is to stop the television from handling the audio at all. Engadget describes this as direct routing: the cable box, streaming device or games console plugs straight into the soundbar's HDMI input, and a second HDMI cable runs from the soundbar's output to the TV. The audio is then decoded by the soundbar alone, skipping the TV's processing and the delays it can introduce.

TV settings, HDMI ARC and last resorts

Television picture and sound modes can also be culprits. Features such as digital noise reduction, dynamic contrast, game mode, cinema mode, virtual surround sound, dialogue enhancers and 3D audio all need extra processing time, according to Engadget. Turning them off can shorten the delay enough for the soundbar to catch up with the picture.

The connection standard matters too. HDMI ARC, the Audio Return Channel that sends sound back down the HDMI cable, lacks the bandwidth to carry uncompressed formats such as Dolby TrueHD or DTS-HD Master Audio without converting them first, which takes time. Upgrading to eARC removes that bottleneck: if both the TV and the soundbar have eARC ports, an ultra-high-speed HDMI cable is all that is needed. Where neither device supports eARC, Engadget suggests direct routing as the better path.

Setting the TV's audio output to PCM or stereo also cuts processing time, though it sacrifices surround sound. A gentler fix is to look in the TV's sound menu for options named Lip Sync, AV Sync, Audio Delay or Audio Sync and adjust the value until the match is right. If nothing helps, Engadget advises unplugging every home cinema component for about a minute, then reconnecting them one at a time, and keeping firmware up to date so known bugs are patched.

Why it matters

Audio delay is common with soundbar setups, so the guide is relevant to a wide range of viewers, particularly those who watch live sport, where a few hundred milliseconds of lag is most noticeable. Because most of the fixes involve settings menus rather than new hardware, they cost nothing to try. Engadget's advice amounts to a short checklist: check the cables, test a second source, adjust the sync controls on the soundbar or TV, consider eARC or direct routing, and reboot the kit if all else fails.