JBL Xtreme 2 vs Charge 4 together with Charge 3. - YouTube
A third speaker makes all the difference. Adding the Xtreme 2 completely changed the sound for the better. : r/JBL
JBL | Xtreme 2 vs JBL Charge 4
Amazon.com: KFD 12V-24V DC Adapter Car Charger for JBL Xtreme, Xtreme 2, Extreme Edition Portable, Extreme 1 2, JBL Boombox 1 2 Wireless Bluetooth Speaker JBL Boost TV Speaker SoundBar DC Power
Dashblaster - Rollbar Speaker Bluetooth Mount - Fits Jbl Xtreme 2 And Xtreme 3 | eBay