how to turn on bass boost on JBL charge 3 - YouTube
How to enable low frequency mode on JBL charge 4 - YouTube
JBL Charge 3 | Tragbarer Bluetooth-Lautsprecher
JBL Charge 3 Waterproof Portable Bluetooth Speaker (Waterproof, with a 6,000 mAh Power Bank and Hands-Free Function) blue : Amazon.de: Electronics & Photo
Why is the low frequency mode on my JBL charger 3 always on, and why can't I turn it off? - Quora