JBL Xtreme 3 is a good alternative to the heavy Boombox 2, and only half as expensive.
JBL Xtreme 3 review: Extremely loud, not so portable - SoundGuys
JBL Xtreme 3 review: rugged and durable with big sound
Review of multiple BT speakers, as well sound quality JBL Xtreme 3 vs Motion Boom Plus 00.36 Firmware : r/Bluetooth_Speakers
JBL Xtreme 3 Portable Bluetooth Speaker Review - LiquidAudio
Review: JBL Xtreme 3 – for the modern adventurer – Homecinema Magazine
JBL Xtreme 3 Portable Bluetooth Speaker - Powerful Sound & Deep Bass - IP67 Waterproof - Pair with Multiple Speakers - Speaker Bundle with Megen Protective Hardshell Case (Black) : Electronics
MASSIVE JBL ORIGINAL PRO SOUND - 4 drivers and 2 JBL Bass Radiators effortlessly deliver dynamic, immersive blue tooth speaker sound with deep bass
JBL Xtreme 3 Portable Bluetooth Speaker - Powerful Sound & Deep Bass - IP67 Waterproof - Pair with Multiple Speakers - Wireless Speaker Bundle with
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Marshall Middleton Vs JBL Xtreme 3 Vs JBL Charge 5 — GYMCADDY