Let's see: boats are almost always used near water.... Ever get into a water fight with a rival boat? Ever have a rival rider come cruising near by, and throw a sheet of water over the whole boat? Ever get caught in a rain? The speakers don't need to be "waterproof" but they do need to be moisture resistant. Audio purists may prefer the sound quality of a paper cone but the paper will simply absorb too much moisture. Cones made of a plastic material will give you much better longevity.
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