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  I want to mention a summary of the recent tap tone research, so far (2017). This information might prove useful in isolating acoustical problems or in selecting a violin for yourself.
  In its simpilist form, the tap tones of these areas should be in their correct relationshipa in order for the best acoustical playing condition.
The underside of the scroll tap should be at 198 HZ.
The underside of the neck below the fingerboard, the top plate and bass bar, and the downward tap on the top surface of the fingerboard {all over - evenly) should match and be at 176 HZ.
The bridge, tailpiece proper, and back plate, nut, saddle, end pin, sound post, sound holes, and chin rest should match and be at 198 HZ.
...The string bar of the tail piece should be at 242 HZ.
..
Tapping with the unsharpened side of the wooden tip of an ordinary wooden pencil (or similar tap tool) should give good results.
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Next, current research shows that the frequencies of these parts should be at certain ideal frequencies. These then order the set of tuned frequencies for each individual part so that the violin works in unison acoustically. These frequency pairings (based on combination of Solfeeggio and C.37.C theory) are as follows:
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142.5..................142.5..........
150.0..................148.5...........
161.0..................160.0.....
177.0..................176.0.... Top plate,bass bar, fingerboard and underside of the neck.
188.0..................185.3.....
198.5..................198.0......Back plate, bridge, sound post and tailpiece proper, nut, saddle, scroll, fingerboard, chin rest, tail gut and end pin.
213.5................. 213.0.......
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...Now what about plate graduation before acoustical tuning?
... I would suggest this practical guide;
...For the top plate, make the plate 2.6mm even all over (except ends and edges).
...For the back plate, use my latest Guarnarie back plate graduation plan.
...I suspect the results will reward your efforts!


(c) 2017 by David Langsather
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C.37.C (HZ).......Solffeggio (HZ)........ :
(modified 7/2017)
242 HZ ..String bar of the tail piece.
 Successful Instruments' Tap Tone Relationships....
by David Langsather...