Owen Bradley Few viewing faults are as distracting as lips that move a fraction of a second out of step with the dialogue. Once you notice it, you cannot unnotice it. The good news is that TV audio delay is almost always a settings problem rather than a hardware failure, and it can usually be corrected in a few minutes with an offset control that already exists on your equipment. The trick is knowing which device is introducing the delay, because the fix has to be applied at the right point in the chain. This tutorial explains why lip sync drifts, how to identify the culprit, and how to dial in a correction that holds across every source you watch.
Why TV Audio Drifts Out of Sync
Video takes longer to process than audio. Every modern TV runs incoming frames through noise reduction, motion interpolation, upscaling and colour processing, and each of those stages adds a few milliseconds of delay. Audio, by contrast, passes through comparatively little work. The result is sound that arrives ahead of the picture, which is why the vast majority of lip sync complaints involve audio that is early rather than late.
A second delay source appears when sound leaves the TV for an external system. Sending audio to a soundbar, receiver or wireless speakers adds transmission and decoding time, and wireless links add the most. Combine heavy video processing with a wireless subwoofer or rear speakers and the mismatch becomes obvious even to casual viewers.
Understanding this ordering matters because it tells you which direction to correct. If sound is early, you need to delay the audio. If sound is genuinely late, which happens with some wireless setups, you need to reduce audio delay or increase video processing, and only some equipment allows that.
What You Need Before You Start
- The remotes for the TV and any external sound device.
- A test clip with clear, close-up speech. News broadcasts are ideal because presenters face the camera directly.
- A few minutes of uninterrupted viewing so you can judge changes without rushing.
- A note of which source you are testing, since each input can behave differently.
Judge sync with talking heads rather than action scenes. Explosions and footsteps are poor references because your brain tolerates far more slack on ambient sound than it does on speech.
Step by Step: Fixing TV Audio Delay
- Identify where the delay appears. Play the same content through the TV’s own speakers, then through the external system. If the internal speakers are in sync and the soundbar is not, the delay was added by the audio path. If both are out of sync, the TV’s video processing or the source itself is responsible.
- Turn off unnecessary video processing. In the picture menu, disable motion smoothing, noise reduction and any advanced enhancement features. These add the most latency of any setting, and switching them off often fixes sync outright while also making film content look more natural.
- Enable game or low latency mode. Most sets have a picture preset that bypasses the majority of processing. Even for film and TV viewing it can be worth using if your set otherwise adds heavy delay, and many TVs switch to it automatically when a console is detected.
- Find the audio delay control. Look in the TV sound menu for a setting called Audio Delay, AV Sync, Lip Sync or Digital Audio Delay. External soundbars and receivers usually have an equivalent under their own audio or setup menus.
- Adjust in small increments. Change the offset by roughly 20 to 40 milliseconds at a time, then watch a talking-head clip for at least fifteen seconds before judging. Large jumps make it hard to tell whether you have overshot.
- Bracket the correct value. Deliberately push the offset far enough that the error clearly reverses, then step back halfway. Finding both edges of the acceptable range and settling in the middle is far more reliable than creeping up from zero.
- Apply the correction on only one device. If both the TV and the soundbar have delay controls, use one of them and leave the other at zero. Two competing offsets are almost impossible to tune and often cancel each other out unpredictably.
- Switch the digital audio output format. If the offset alone will not fix it, try changing the TV output between bitstream and PCM. Bitstream sends the encoded stream for the soundbar to decode, which adds decoding time; PCM makes the TV do the work instead. Each option shifts the timing, and one may land closer to correct.
- Check the source device settings. Streaming boxes, consoles and disc players have their own audio configuration. Matching the output format to what your sound system natively supports removes an unnecessary conversion step and its associated latency.
- Retest every input. Sync can differ between the built-in apps, an aerial tuner and each HDMI input. Confirm the correction on the sources you use most, and note any that need a different value.
Wireless Speakers and Their Extra Delay
Wireless audio is convenient but adds latency by design. Bluetooth headphones are the worst offenders, often introducing delay large enough that no TV offset can fully compensate, especially with older codecs. Wireless rear speakers and subwoofers that pair with a soundbar are usually better because the manufacturer synchronises them internally, but they still add time compared with a wired connection.
If you rely on wireless listening, look for a device supporting a low latency codec and pair it with a transmitter that supports the same one. Where sync matters most, a wired connection remains the dependable answer. Systems built around best surround sound speakers generally handle internal timing better than mixing separate wireless components from different brands.
When the Problem Is the Broadcast, Not You
Sometimes the delay is baked into the content. Live broadcasts, particularly sports and news with remote contributors, occasionally go out with sync errors at the studio end. Streaming services also drift during buffering events or when a stream switches bitrate mid-playback.
Two clues point to a content problem rather than an equipment one. First, the error appears on one channel or one app but not others. Second, it drifts during viewing rather than staying constant. Equipment-induced delay is consistent, so anything that wanders is coming from upstream. In that case, restarting the app or changing channel and returning usually resets the stream. Do not retune your carefully set offset to chase a temporary broadcast fault, or you will have to undo it later.
Choosing Equipment That Avoids the Problem
Some setups are inherently more prone to sync trouble than others. A TV with heavy, non-defeatable processing paired with a wireless sound system is the worst combination. A display with a proper low latency mode connected to a soundbar over eARC is among the best, because the connection is wired, the handshake includes timing information, and the TV can pass the audio through with minimal handling.
If you are assembling a system now, prioritise wired connections and devices that expose a clear delay control. Our guide to the best soundbar speakers covers models with usable sync adjustment, and the best gaming TVs with eARC roundup lists displays whose audio return path is well behaved. For those weighing whether an external system is worth adding at all, the best TV speakers comparison sets out the trade-offs, while the best home theater speakers guide covers full room setups where timing across multiple channels matters most.
Mistakes to Avoid
The commonest mistake is adjusting the offset on two devices at once. If the TV and the soundbar both apply a delay, you are effectively tuning two dials against each other and will never find a stable answer. Pick one and zero the other. The second mistake is judging sync using action sequences or music, where the brain is far more forgiving than it is with speech.
A third error is making large adjustments and giving up when the result feels worse. Overshooting is normal and informative, so bracket the range deliberately rather than abandoning the process. Finally, many people never touch the picture menu, when motion smoothing alone can account for a substantial part of the delay. Turning off processing first often means far less offset is needed afterwards.
Frequently Asked Questions
How much delay is actually noticeable?
Most viewers begin to notice audio arriving early at around 40 milliseconds, and almost everyone sees it beyond 100. Late audio is tolerated a little better than early audio.
Why does sync differ between apps on the same TV?
Each app handles decoding and buffering differently, so latency varies. Set your offset using the source you watch most and accept small differences elsewhere.
Can a firmware update fix lip sync?
Often, yes. Sync handling is a frequent subject of TV and soundbar firmware fixes, so update both devices before spending long tuning offsets manually.
Does eARC improve synchronisation?
It can. The enhanced return channel includes automatic lip sync correction data, which lets compatible devices negotiate timing rather than relying on you to set it manually.
Should I use optical instead?
Optical is not inherently better for sync and lacks automatic correction. It remains a reasonable fallback but is rarely the solution to a delay problem.
Final Thoughts
Fixing TV audio that is out of sync is a process of elimination followed by careful tuning. Establish whether the delay comes from the TV’s video processing or the audio path, switch off motion smoothing and other enhancements, then apply a single offset on one device and bracket your way to the right value using close-up speech. Keep wireless links out of the chain where sync is critical, and remember that drifting errors usually belong to the broadcast rather than your hardware. Spend ten patient minutes on this once and you will not think about it again, no matter what you watch through the rest of 2026.
