Here’s how to charge JBL Xtreme speaker through its protected DC input power port and the included 19 volt charger. How to Charge JBL Xtreme Speaker: Summary In short, first, we suggest that you charge the Xtreme speaker with the included JBL charger. Why? Because this power supply meets the speaker’s current needs, and is … Continue reading How to Charge JBL Xtreme Speaker