List, Piano is a Kawai GS-30 grand that I am guessing is about 14 years old. The piano is an ex-institution piano currently being restored. It has lived all its life in a mild coastal environment (60-90 F) where one can be pretty certain the relative humidity of its environment was greater than 50%. The soundboard has a few noticeable pressure ridges but nothing extreme. Board has minimal crown (although much the same as every other GS-30/40 measured), pins are TIGHT! The to be restrung strings are rusty. The piano is now located in a room that the humidity swings from 60% to 80%. On occasions it dips briefly to 50% on very 'dry' days. So my question to the list is do I: (a) install a DC de-humidifier (tropical version which is set at 55% or so I believe), or (b) because the piano has lived in a high humidity environment all its life and settled into that groove just leave it alone. I am concerned that the pressure ridges may open up if the DC is constantly trying to pull the humidity down from the 70% to 55%. Appreciate the wisdom of the list on this one. Regards, John Woodrow Sydney, Australia ICPTG.
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