JBL Xtreme 3 is a good alternative to the heavy Boombox 2, and only half as expensive.
JBL Xtreme 3 review: Boshing out the bass
JBL Xtreme 3 Review, Buytronics
JBL Xtreme 3 Review
JBL Xtreme 3 BT speaker is one bad boy (review)
JBL Xtreme 3 Review
JBL Xtreme 3 Review
JBL Xtreme 3 review: rugged and durable with big sound
JBL Xtreme 3 Portable Bluetooth Speaker Review - LiquidAudio
JBL Xtreme 3 review: Extremely loud, not so portable - SoundGuys
JBL Xtreme 3 (Black) Waterproof portable Bluetooth® speaker at Crutchfield
JBL Xtreme 3 Portable Bluetooth Speaker - Powerful Sound & Deep Bass - IP67 Waterproof - Pair with Multiple Speakers - Wireless Speaker Bundle with Megen Protective Hardshell Case (Blue) : Electronics