Generally speaking, a
paper diaphragm speaker is easily to have the problem of molding
or distortion in a humid environment, and is certainly damaged in
the water. On the other hand, the mylar diaphragm speaker is normally
waterproof that it can work with drip, fog, or even slightly in
the water if we use the rubber ring to fix the diaphragm instead
of paper ring.
Another important thing
is that all the diaphragms
of the speakers are very thin, and the pressure of water might distort
even break the diaphragm if it is too deep.
In conclusion, the mechanism
design is also very important, especially the joint should be completely
sealed in order to reach waterproof function.