I was listening to a very loud boat stereo for over four hours one day. I noticed that his boat was not running and I couldn't hear a generator even when I went right next to the boat. The owner said that he used a waterbox like in a jet ski for a muffler. He showed me an outlet on his transom with only a trickle of water coming out with some bubbles, but no noise. Anybody have any ideas or experience on this type system.
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