Don, I won't argue that it would be nice to have a narrower window for "excellent," and that any change whatsoever in humidity will produce tuning ramifications, but I'm not too sure we can actually achieve 10% in many instances. If you think we can (and maybe a full system with full covers does that), perhaps an "ideal" category of "within 5%" could be added. My sense is that building systems are lucky to achieve better than 15%. But having an "ideal" category, described as full system with complete baffles, could be an incentive to spend the money for such installations. What do you think? Fred Don wrote: > > Hi Fred, > > I have data that suggests that "if" a piano is allowed to stabilize that a > 5% change in R.H. causes a pitch swing of 4 cents at A4. So I think your > revision needs to have a much narrower window for "excellent" humidity > control. > > Regards, > Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. > > mailto:pianotuna@accesscomm.ca > http://us.geocities.com/drpt1948/ > > 3004 Grant Rd. > REGINA, SK > S4S 5G7 > 306-352-3620 or 1-888-29t-uner
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