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@Airhead
IPX4 is allowed in zone 1 for bathrooms. IPX7 for zone 0. Generally that means IP44 lights in the ceiling are fine, Zone 0 is actually in the bath or shower tray. First digit (4) means protection against objects >1mm, second digit (4) means no harmful effects from splashing water. I would say that speaker grille achieves that. In any case there's no way to reach live voltage without puncturing the speaker.
It does require the bathroom to be 30ma RCD protected though which is in part why the regulations have been adjusted.
The whole IP rating in bathroom business is a bit of a electricians cliche.