Yes, they’re designed to withstand direct contact with water. However, permanent submersion will damage them.
Polk Audio multi-application loudspeakers, such as the Atrium® Series, meet or exceed American military specifications for environmental endurance. The tests have coded names like “ASTM D5894-UV Salt Fog,” “Mil standard 810 Immersion” and “Mil standard 883 Method 1009 8 for salt and corrosion.” But passing them means that Polk multi-application loudspeakers can withstand some of the worst that Mother Nature can dish out. In addition, stainless steel, brass and aluminium hardware ensures years of rustproof reliability.