JBL Charge 4 - Bass-test, low frequency mode, no grill/cover... - YouTube
JBL Charge 4 Bass Sound Test | Low Frequency Mode On! - YouTube
I've activated Low Frequency/Debug mode and am using an app to play very low freq audio to enjoy the driver jello effect. At around 50% volume, am I risking any damage? Or
JBL Charge 4 Low Frequency Mode - Tom's Tek Stop
JBL Charge 4 | How to activate Low Frequency Mode | Bass Test (Disable DSP) - YouTube
JBL Flip 4 Review - RTINGS.com
How to tell if the low frequency mode is on or off on my JBL Flip 4 - Quora