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I have never done any formal tests on your topic. But, some humidity is good in a listening environment for a couple of reasons. Static buildup is usually less in a room with higher humidity. Also some speaker cones can have a longer life if they are not in a very dry environment for an extended period of time. If I were to venture a guess as to what the effect of high humidity would be on the sound, I would say that since the humid air is denser than non-humid air by virtue of the added water, that the SPL(efficiency) would be somewhat higher. Since the water in the air has changed phase(for the most part), it is no longer a liquid and should not behave as a diffusing media. In fact, as you may know, sound travels more efficiently under water than it does above water. Whether this characteristic translates into humidity is not known to me.