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speaker makers generally avoid the word waterproof for even their most rugged designs many waterproof speakers are later reclassified as water-resistant or splash resistant after failing certification tests we took a look at two speakers that claimed to be waterproof to some degree grace digital's echo stone and I Holmes ibn six the grace digital echo stone is $150 Bluetooth speaker set the company states the speakers waterproof shockproof and even weatherproof capable of withstanding temperatures ranging from negative 40 degrees to 165 degrees Fahrenheit echo stone contains a pair of two and a half inch speakers in the front and slightly larger subwoofer in the rear of this hard plastic frame two substantial feet keep echo stone in place on flat surfaces and large ribs on the side help with drop protection grace digital claims echo stone can be dumped up to six feet of water we submerg