Swedish company, I believe.
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I have a pair of TurtleBox its in like a pelican case waterproof with a 6X9 coax speaker bluetooth pairs for stereo balanced for outside plays louder then you need battery never died played them for over 10hrs They sounded great on the beach this summer set them up 20ft out 20ft wide the speakers disappear sounded like the Beach Boys where coming out of the waves they are a little over your budget at $374 each
DemerBox. They’re nearly indestructible and sound fantastic. Actual bass when the port plug is removed, and 100% waterproof when it’s installed. Ours is regularly submerged under a foot of water when we take it out on whitewater runs.
I’ve had it out on 3-4 day river trips and never ran out of battery. Plus you can change your device off the internal battery.