Weather Resistant Surrounds? near aquarium

So, I am moving things around in my living room. It appears that one of the surrounds will have to be above my 240 saltwater tank. I don't think the Alon Centris will be happy here. Any thoughts on a decent speakers that will work with home theater that won't mind the humidity? Obviously, the tank has glass tops and a canopy, but in the summer it typically evaporates about 2 gallons a day.