Humidity question - please try to answer...

It also has to do with psico-accoustics, since on a rainy day, or night time, human senses become more "active" and "alert" than under normal conditions where some distractions take effect.

my .002 cents

Fernando

Humidity and temp will cause all sorts of things to happen to Turntable arms and Tubes and the like. If you take a electric guitar and put it where it can get a cooler draft of air you will find that it will more than likely go out of tune. Tune it when the guitar is cold and when it gets warm it will also go out of tune. All components that are not totally digital will do the same. Paper drivers on the speakers for instance. Wire on the speaker transducer will expand and contract and change the potential speed of the overall design. The paper will collect moisture and change the sound of that component. The wood that the speaker box is made out of will dry and change the way the wood resonates with the drivers. The air becomes heavy with moisture and transmits the sound in a different manner. The walls of your house reflect the sound differently because of the moisture content.

The easiest experiment is to take a hunk of wood and rap on it with your knuckles when its dry. Wet the wood using water or even a chemical and rap on it again to hear the change in sound.

I thouhgt it was straightforward:
higher humidity = denser air = better sound transmission
Or am I missing some fundamental physical laws here?

I have a sprinkler system set up in my listening room:)

Papertrail, have you considered a fountain, or are you constrained by room dimensions?