Thanks, Ron. That's very helpful. The cumulative loss of compression would be due to repeated cycling of high to low humidity, yes? Resulting in crushed wood fiber structure? I'll start examining pianos with a little more care and attention. Partly it's a question of knowing precisely what to be looking at and listening for. And having the tools to measure. BTW, I recently constructed a home made version of the Lowell gauge (when I finally decided to spring for one a few years ago, it had become unavailable). I'll post pictures for those interested. Regards, Fred Sturm University of New Mexico fssturm at unm.edu On Apr 3, 2006, at 11:58 AM, Ron Nossaman wrote: > Is it a matter of "stiffness" (which can mean DB, spongy wood, > lack of firm support from rim, a few scenarios)? Stiffness. Cumulative loss of compression in the panel letting the assembly become too flexible. Sometimes, adding mass can compensate to some degree (up to a point), but the lack of stiffness that caused the problem the weight lessened, is still there. <snip> > How many nasty sounding killer octaves have you found that had both > positive crown and positive bearing at the point in the scale where > the problem is? For that matter, how many times have you checked KO > bearing and crown when you hear the attack distortion there, > looking for some relationship between the three? > > Ron N -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20060403/57c3e8bc/attachment.html
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