JBL Xtreme 3 is a good alternative to the heavy Boombox 2, and only half as expensive.
Review: JBL Xtreme 3 – for the modern adventurer – Homecinema Magazine
JBL Lifestyle Xtreme 3 Waterproof Portable Bluetooth Speaker - Black Reviews
JBL Xtreme 3 review: Extremely loud, not so portable - SoundGuys
JBL Xtreme 3 BT speaker is one bad boy (review)
JBL Xtreme 3 Review
JBL Xtreme 3 Review: Made for the outdoors
JBL XTREME 3 – GTK254
Unleash powerful sound everywhere. Poolside. Picnics. Just hanging out. Music makes the party. The JBL Xtreme 3 portable Bluetooth speaker effortlessly delivers massive JBL Original Pro Sound. With four drivers and 2 pumping JBL Bass Radiators, the powerful sound draws everybody in, and with PartyBoost, you can connect multiple JBL PartyBoost-enabled speakers to take things to the next level.
JBL - Xtreme 3 - Portable Bluetooth Speaker - Black
JBL Xtreme 3 Review - WATCH THIS BEFORE YOU BUY!
