Clearly ribs do participate in the transmission of energy across the grain of the panel. Even when a soundboard is cracked all the way across the panel in several places the entire panel still moves. David Love davidlovepianos@comcast.net -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Ric Brekne Sent: Sunday, February 05, 2006 7:04 AM To: pianotech Subject: soundboard vibration: was News Flash Grin.... Well I am not going to get sucked into that debate agin.... I remember well 3 years or so back. I'll just restate my own unschooled perspective that it seems to me that all vibrational energy passing through the panel, over the surface, across the ribs, or wherever are all an intregral part of what ends up being the longitudinal wave passing through the air that hits our ears. As for how a soundboard is not a speaker... I'm afraid thats beyond my knowledge to tell. Seems like a lot of good analogies are possible comparing the two for sure... but just how far that goes is another question. I would say however... that the fact that the air gets moving because of the transverse motion doesnt mean that internal vibrations caused by the same input, dispersed by the same system are not interconnected... interdependant. But this is all off on a completely different tangent... and... well go there if ya'lls wants to. hehe Cheers RicB Terry writes: And this is the heart of my question. Do sound waves travel through = soundboard wood (in any meaningful way) or does the soundboard assembly = act primarily as a diaphragm whose vibration is caused by the vibrating = bridge, which in turn is caused by the vibrating string. That is the way = I've always pictured it. And hence my "circle of sound" comments. I know a soundboard is not a speaker - but how different is it? A stereo = speaker does not rely on soundwave transmission through the cone = material - but rather it is simply driven by the coil and magnet and = electic current. Is not the soundboard simply driven in a similar way by = the strings/bridges? _______________________________________________ Pianotech list info: https://www.moypiano.com/resources/#archives
This PTG archive page provided courtesy of Moy Piano Service, LLC