Making the Three areas Equal...(Part 'B')
(1/2022)
page AA_57
...By David Langsather, Violin Acoustical Researcher www.violinresearch.com info@violinresearch.com
..Each part of the violin has an ideal tap tone (specific vibrational mode) at which that part best contributes to the overall sound production.
..These vibrational standards are all on a special sound scale, which apparently are dictated by out hearing apparatus (IE: the three little bones in our inner ear) {see research book: " C37" by acoustical researcher and author: Dieter Ennemoser.
These are the three tap tone goal tap references you can use in tuning these parts: [Click to hear frequency]:
In our first situation example, the three section tap tones are as follows: (goal is 213HZ):
[Usually the center section tap is half way between the two end areas...]
290HZ.
190HZ
240HZ
..Our first action is to lower the too high left and end are down to 213 HZ goal by evenly scraping / sanding the hashmarked area...
Once this is accomplished, the tap tones will probably be close to:
213HZ.
201 HZ.
190HZ.
In order to accomplish this; we will scrape / sand the area marked until the right end area reaches 213 HZ goal tap tone frequency... Then all three area should be at 213 HZ, although not completely even all over each area.
This next example is for all three area below the goal frequency for this kind of part:
180HZ.
185HZ.
190HZ.
Because all three areas are below our goal frequency (in this case 213 for a top plate of tailpiece); we raise the end areas by scraping outward evenly from the red X acoustical center toward the end plate being raised, scraping a little move in the left center area because that end is slightly lower the right.
Until each end area reaches goal tap tone; Now all areas should be at 213 HZ. Tap the acoustical center point to double check overall frequency is correct.[
When you have gotten this far; go ahead and comparison tap all around in the marked areas and scrape down any high tap tones spots until these areas match the rest of the center area. Once that is done, recheck the three areas and re-adjust to overall goal tap tone frequency.
