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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

I have never built a viola…

but I used to play classical guitar, knew a guitar and lute maker, and had him build a guitar for me. I watched numerous instruments being built, including soundboards being voiced by shaving and strutting.

You're right - it isn't all horizontal and vertical motion or, rather, it is but it's movement that has to be defined in 6 degrees of freedom (up/down, left/right, and front back) and the movement is even more complex because the shelf/soundboard is relatively fixed at some points and flexing elsewhere. There's a lot going on, especially when the soundboard or shelf or whatever is being excited by vibration from a number of different frequencies, and also excited at different points by different frequencies.

I saw a quote somewhere recently - it may have been on another board here - where someone had said something like "In theory there is no difference between theory and practice, but in practice there is a difference." Good accounts that are really useful explain that difference also.

David Aiken


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