Here is another rugged waterproof speaker ready for your outdoor adventures. The BRAVEN BRV-XXL is water resistant, dirtproof, and sandproof. It has a 15,600mAh power bank to charge your gadgets. This speaker has 4 HD audio drivers and 1 subwoofer. It runs for 14 hours on battery.
The BRV-XXL comes with adjustable bass and treble settings. It is available in White & Black/Titanium versions. Costs under $300 at this time.