I don't think that's true, unless your speakers are designed to handle that. Typical cans will leak over time, el cheapo ones will leak all the time. If you drive down the road in the rain, they will leak. I have Polk Atrium salt water rated, immersion rated ones, and I've found water in them occasionally. Nothing personal, but I'm not putting condoms on my speakers, too much hassle. They won't keep water out. They're simply a cosmetic thing. Can't be bothered, myself.
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