Sound
Post Placement
Fiddle theology often mentions moving the sound post as a way to
improve tone. This is true, but complicated. Imagine the topography
of the inside of the fiddle. The greatest distance from the back
to the top is somewhere near the center. The distance diminishes
along a curving line as you move toward the ribs. Everything varies
with graduation and shape. A properly fit sound post is exactly
the right height, and with the exact bevel on both ends, to fit
perfectly in one location inside the violin. If you move it to another
location it will be either too short or too long or the top and
bottom bevel will be wrong. I think that the most common reason
for a sound post not being in the traditional position is that a
post cut too short will still stand up if you move it closer to
the edge. A post that is too long won't stand up. One that is too
short, for whatever reason, shrinkage of the post, swelling of the
violin, or one luthiers knife slice too many, will still stand,
but out of place. It is probably true that some violin
will sound better with a perfectly fit sound post a few mm farther
back or closer to the center etc. If you look for this sweet spot
by moving one sound post around you are doing a flawed experiment. I
fit a new sound post, perfectly, in the traditional position. I
then move on to the bridge.
Steve Mason
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