If you’re hearing pops, static, or a crackling sound from an LG soundbar, the problem is usually traceable to a cable, source, setting, or hardware fault.
This guide walks through the most effective checks so you can isolate the cause and restore clean audio.
Why an LG Soundbar Crackles
Crackling audio often happens when the soundbar is receiving a weak, distorted, or interrupted signal.
That interruption can come from damaged HDMI ARC or optical cables, Bluetooth interference, incorrect audio formats, firmware issues, or an overloaded speaker driver.
LG soundbars commonly support HDMI ARC or eARC, optical input, Bluetooth, and in some models Wi-Fi-based features.
Because there are multiple possible signal paths, the easiest way to fix the issue is to test one path at a time and narrow down the source.
Start With the Fastest Checks
Before changing advanced settings, do the basic physical and source checks.
These steps solve a large share of crackling complaints.
- Lower the volume to a moderate level and listen for distortion.
- Confirm the crackling happens on all inputs, not just one source.
- Test a different movie, song, or app to rule out a bad audio file.
- Power-cycle the TV, soundbar, and any connected streaming device.
- Unplug the soundbar from power for 60 seconds, then reconnect it.
If the crackling disappears after a reboot, the issue may have been a temporary handshake or processing glitch rather than a hardware defect.
Check the Cables and Connections
Loose or damaged cables are among the most common causes of crackling sound.
A connection that is partially seated can create intermittent pops, static, or channel dropouts.
Inspect HDMI ARC or eARC
If you use HDMI ARC or eARC, make sure the cable is plugged firmly into the TV’s ARC/eARC port and the soundbar’s HDMI OUT port.
Use a certified high-speed HDMI cable, especially for 4K, HDR, or lossless audio formats.
- Try a different HDMI cable.
- Move the cable away from power cords and wireless transmitters.
- Use the TV’s designated ARC/eARC port only.
Inspect Optical Audio
Optical cables can also cause crackling if the ends are dirty, bent, or not fully inserted.
You should see a steady light in the cable when connected to the TV or sound source.
- Remove and reinsert both ends.
- Check for dust on the connector tips.
- Replace the cable if the protective cap is damaged or the connector is loose.
Rule Out Bluetooth and Wireless Interference
If the crackling happens only over Bluetooth, the issue may be interference rather than a defective soundbar.
Bluetooth audio can be disrupted by nearby routers, microwaves, cordless phones, or too many wireless devices in a small space.
- Move the source device closer to the soundbar.
- Remove other paired devices temporarily.
- Turn off and re-pair Bluetooth.
- Test a wired connection to compare audio quality.
For Wi-Fi-based playback or smart features, place the router farther from the soundbar if possible and avoid signal congestion around the TV console.
Adjust Audio Settings on the TV and Soundbar
Incorrect format settings can cause LG soundbar crackling sound, especially when the TV sends an unsupported surround format or the signal is changing dynamically between stereo and multichannel output.
Set the TV Audio Output Correctly
On many TVs, the cleanest setup is HDMI ARC or eARC with PCM, Dolby Digital, or Auto selected depending on the soundbar model.
If you hear crackling after enabling a high-end format, test a simpler setting.
- Switch from Bitstream to PCM as a test.
- Disable audio processing features like volume leveling, AI sound enhancement, or extra equalization.
- Confirm the TV is not outputting to both speakers and soundbar at once.
Check Soundbar Sound Modes
Some LG soundbars offer sound modes such as Standard, Cinema, Bass Blast, or AI Sound Pro.
Aggressive bass enhancement or virtual processing can make distortion more obvious, especially at higher volumes.
- Try Standard mode first.
- Reduce bass and subwoofer levels.
- Compare sound with surround effects turned off.
Update Firmware on the LG Soundbar and TV
Firmware updates can fix HDMI handshakes, audio decoding bugs, and wireless stability issues.
LG regularly releases software updates for many soundbar models through the LG ThinQ app, USB update files, or the TV’s connected-device workflow.
- Check the soundbar model number before downloading updates.
- Update the TV firmware as well, not just the soundbar.
- Restart both devices after the update completes.
If the crackling started after a recent update, a new firmware version may later resolve the issue, but in the short term you can test different input formats or reboot the system after reinstalling the connection.
Is the Problem Coming From the Source Device?
Sometimes the soundbar is fine and the source device is sending a flawed signal.
Streaming sticks, cable boxes, game consoles, and laptops can all create audio artifacts if their settings are mismatched or if the device itself is having performance problems.
- Test another source device on the same input.
- Restart the streaming box or console.
- Check whether the source is set to surround sound when only stereo is needed.
- Try a different app, channel, or content type.
If crackling appears only during one app, the app may be using an audio codec that your current chain handles poorly.
Reset the Soundbar if Settings Are Corrupted
If basic troubleshooting fails, a factory reset can clear corrupted configuration data.
This is useful when the soundbar has unusual behavior after a power outage, update, or repeated pairing changes.
- Back up any custom settings you want to remember.
- Perform the model-specific reset procedure from the manual.
- Re-pair Bluetooth and reconnect HDMI ARC afterward.
After resetting, test with default settings before restoring bass boost or surround enhancements.
When Crackling Means a Hardware Problem
If the soundbar crackles on every source, every cable, and every output mode, the issue may be hardware-related.
Common internal causes include a failing amplifier, damaged speaker cone, loose internal connection, or a power supply problem.
Signs of hardware trouble include:
- Crackling that gets worse as volume rises.
- Distortion from one speaker channel only.
- Noise even when no source is connected.
- Persistent popping after reset and firmware update.
At that point, check warranty status and contact LG support or an authorized repair provider.
Note the model number, serial number, input used, and the exact circumstances when the crackling occurs.
How to Prevent Crackling From Returning
Once the sound is clean again, a few habits can help prevent the issue from coming back.
Use quality cables, keep firmware updated, and avoid running the soundbar at maximum volume for long periods.
Also make sure the soundbar has enough ventilation and is not pushed tightly against other electronics that generate heat or interference.
- Keep HDMI and optical cables short and undamaged.
- Use one primary audio format instead of constantly switching modes.
- Place wireless routers and power adapters away from the soundbar.
- Dust vents and ports regularly.
By testing connections, simplifying audio settings, updating firmware, and isolating the source, you can usually solve LG soundbar crackling sound without guesswork.