why does my soundbar make a loud popping or cracking sound sometimes when i change the volume or source?

Diagnosis

The loud popping or cracking sound experienced during volume shifts or source switching on the JBL Bar 500 is typically a symptom of a "digital handshake" failure or a DC offset spike. When you switch sources or adjust volume, the soundbar and the source device (TV, Blu-ray player, or Console) must renegotiate the HDMI-CEC and HDCP (High-bandwidth Digital Content Protection) protocols. If there is a momentary mismatch in the sample rate or a delay in the synchronization of the audio clock, the amplifier sends a sudden burst of voltage to the drivers, resulting in an audible "pop." This is frequently exacerbated by the "Auto" setting on many smart TVs, which attempts to switch between Dolby Atmos, DTS, and Stereo dynamically. When the Bar 500 receives a sudden change in the bitstream format without a clean transition, the internal Digital-to-Analog Converter (DAC) can produce a transient spike. You can confirm this is a signal issue if the popping occurs primarily when switching from a streaming app (like Netflix) to a game console, or when the TV is first powered on while the soundbar is already active.

How to Fix It

To eliminate these transients, you need to standardize the audio stream and ensure the HDMI-eARC (Enhanced Audio Return Channel) handshake is stable. Follow these exact steps:

1. Access your TV's Sound/Audio Settings menu using your TV remote.
2. Locate the Digital Output Audio Format setting. If it is set to "Auto" or "Bitstream," change it specifically to PCM. This forces the TV to decode the audio before sending it, removing the handshake instability.
3. Navigate to the HDMI-CEC (often called Anynet+ on Samsung, Bravia Sync on Sony, or SimpLink on LG) settings and toggle it OFF and then ON again to reset the communication bridge.
4. Ensure the HDMI-eARC mode is set to "On" rather than "Auto" to maintain a constant high-bandwidth connection.
5. Power cycle the system: Unplug the JBL Bar 500 and the TV from the wall outlet for exactly 60 seconds. Plug the TV in first, let it boot, and then plug in the soundbar.

If That Didn't Work

• Swap the HDMI Cable: Many "bundled" cables lack the shielding required for eARC. Replace your current cable with a certified Ultra High Speed HDMI 2.1 cable (48Gbps). A cable with poor shielding can pick up electromagnetic interference (EMI) from nearby power strips, which manifests as pops during voltage changes.
• Disable "Eco Mode" or "Auto Power Down": Some TVs cut power to the HDMI port to save energy. When the Bar 500 wakes the port up, it causes a power surge pop. Disable any "Energy Saving" or "Eco" modes in the TV's system menu.
• Test Optical Connection: If the popping persists, bypass HDMI-eARC entirely and use a TOSLINK Optical cable. If the popping disappears, the issue is definitively a handshake conflict between your TV's firmware and the JBL's HDMI controller.
• Perform a Hard Factory Reset: With the soundbar powered on, press and hold the Volume + and Volume - buttons simultaneously for 5 seconds until the display indicates a reset. This clears the internal cache of stored device handshakes.

Heads Up

• Avoid plugging the soundbar into a cheap power strip with other high-draw appliances (like a vacuum or space heater), as voltage sags can cause the amplifier to "pop." Use a high-quality surge protector.
• Keep the soundbar at least 12 inches away from large metal objects or high-powered Wi-Fi routers to prevent RFI (Radio Frequency Interference) from bleeding into the audio circuitry.
• Check for firmware updates via the JBL One app regularly; JBL frequently releases patches specifically to address HDMI-CEC compatibility issues with new TV models.