Humidity Controlled Musical Instrument Storage
Could you imagine your instruments sounding out of tuned?
The tone of a musical instrument with a pure timbre is significantly affected under high humidity conditions. Wood is an organic material which exchanges moisture with the surrounding air. It swells and contracts depending on its moisture content, and its moisture level depends directly on the moisture in the surrounding air. This change in shape and size puts stress on the instrument.
When it gets smaller, parts of the instrument like the top are under tension which will cause formation of cracks and failure of the joints and seams. When it gets larger, joints and seams can also fail, and at high moisture levels, wood's resistance to bending and permanent deformation goes way down. Heat and moisture were used by the maker to bend the ribs on your instrument, so you can understand how excessive moisture can result in permanent distortion of the top and a permanent sagging of the neck height. The dimensions and strength of the wood change with moisture content. Therefore, sound of instruments changes with moisture content.