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Our bathroom is about 1/10th the size of diable's and gets full of steam (the whole thing is a wet room) and to be honest our whole building project is over-engineered anyway. They weren't that pricey though, Cambridge Audio jobs from Richer Sounds.
As I said I don't know what I'm talking about and was just curious - didn't mean to make @diable panic ;)
Steam over a long period of time would be the best reason to have a bathroom rated speaker, yours would resist water jets so it sounds like they would survive outdoors. Nothing wrong with over engineering, except the cost. You do still get a lot of professionals insisting on IP ratings way above requirement, I guess that leads to the general population believing that's what's required.
Odd thing is the electricians guides to part p and BS 7671 don't contain an IP rating chart.
The other thing is the second number (liquid protection) tends to dictate the dust rating, so a submersible light (IPX7) must be dust tight (IP6X)