---------------------- multipart/alternative attachment Sarah What your describing is a linear spring rate. IMO a sound board system is more non-linear This is the way it responds under my hand when stressing the panel to set bearing. The first 2-3 mm I compress it are not difficult but after that it get's way stiffer. Hammers are also non linear felt springs. Dale Sarah wrote I think you're confusing stiffness with force. "Stiffness" simply means "spring constant." If you take a relaxed spring and compress it by a mm, it takes a certain amount of force to do that. Then if you compress the spring by 10 mm and add enough force to compress it a mm more, it will take the same increment in force to compress it that last mm as it took to compress the relaxed spring by the first mm. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/38/1c/a5/72/attachment.htm ---------------------- multipart/alternative attachment--
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