---------------------- multipart/alternative attachment Vladan In my Opinion & under the scenario you proposed ie. same crown. I'd suggest if the board thickness are the same & the bearing setup zaactly the same way ie. if the Same moisture content was present on the day the ribs were glued on & on the day the bridge heights were cut for bearing & also the MC was the same in each at that time ,there would be little tonal difference. The problem is factory compression crowned board & the inherent inconsistencies that are & were allowed to exisit in the factorie invironment create a wide variety of anomallys. There are no agreed on thicknesses for boards in old Stwys ,as I've witnessed from model to model, but just a parameter. A too thick board even with appropriate amounts of crown & bearing will cause a stingy sound as quick as any thing I know. But I usually do not find this condition in older stwys. In the case you present it's always many things that contribute to tonal constipation or freedom. Also different species of spruce used in models 50 yrs apart contribute to some of the difference. Ie Sitka boards used in more stwy models in the 1970s & the overall skill of the bellyman. It's many things. I have used the hacklinger gauge & it is expensive & accurate Dale Let's say you are interested in piano design and you come across a couple of Steinways, same model, built 50 years apart. One sounds great, the other one doesn't. They look similar enough. The scale is the same. Both have the same amount of crown, the ribs look similar, even the grain is similar looking. One could simply say: "The wood is different, they don't make them out of that good old wood any more." On the other hand, what if the acoustic difference is due to soundboard profile changes (intended or not)? Maybe they have changed the thickness profile in the intervening years and that is the primary cause of the tonal difference. You would not know this unless you measured. One can save a lot of time by comparing things that others have already taken time to build. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/2a/11/c8/55/attachment.htm ---------------------- multipart/alternative attachment--
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