JBL XTREME 2 - LOW FREQUENCY MODE/ DSP OFF MODE "EXTREME BASS!?" - YouTube
JBL Xtreme 3, Wireless Portable Bluetooth Speaker, Pro Sound with Powerful Bass Radiators, Built-in Power bank, Party boost, IP67 Water & Dust proof - Sahu Agencies
JBL Xtreme 3 review: Extremely loud, not so portable - SoundGuys
JBL Xtreme - EXTREME BASS!!! Low Frequency Mode - YouTube
JBL Xtreme 3 Review: Beast Speaker!
JBL Xtreme 3 Specs and Features of this Speaker - Tom's Tek Stop