It's a fun party trick, but the DemerBox will often land face down and the pressure of the water slamming into the speaker cone can potentially damage them. Your DemerBox definitely floats and is fully waterproof with the Port Plug installed.
Here are two photos of the speaker cones. These are enclosed under the grills on the front of your DemerBox.
The first image is a healthy, functioning speaker. The second image is a speaker cone that was installed in a unit thrown facedown into water. When the smooth aluminum interior hit the water, it stamped the face resulting in distorted sound. The only solution is for us to replace the speaker. Please open a support ticket above and we will be glad to get you back up and running.
Check out this article to learn how to make your DemerBox float.
Here's our article on how to make your DemerBox waterproof.