---------------------- multipart/alternative attachment It is my personal opinion that most uprights are not dependent on crown for tone production. Yes some sound better than others & some have a variety of rib configuration. I believe it's primarily a mass driven system. The upright board is tapered like a wedge . Thiicker at the top or treble a much thinner toward the bottom & most have 11 or 12 ribs which adds mass & stiffness as well. The best sounding ones though have real rib structure & at least some bearing. My sister has an Ivers & pond Upright & though it sound quite good it has a weakness in the treble area which is a lack probably a lack of mass. With ribs that shallow it could not have ever had much if any crown. JMho Dale Interesting. This may be superfluous, but I would like to mention that some of the best-sounding old upright pianos I have seen have very wide, shallow ribs. And no cracks in the still very "live" boards. Knabe. Ivers and Pond. Mason. Not intending to muddy things here. I believe in and support the idea of rib-crowning. But how did these allegedly CC boards survive in Georgia for 100 years so well? Lots of varnish? Thump ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5c/80/c4/ae/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC