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Comment by BUGGY (C) on May 17, 2015 at 1:37am

Corrected link
https://www.physicsforums.com/threads/human-body-resonant-frequenci...

Comment by BUGGY (C) on May 17, 2015 at 1:36am

Silent Jim
ttps://www.physicsforums.com/threads/human-body-resonant-frequencies.501607/
Add a h infront of that link
This is what you are meaning, hence if instruments match these frequencies
It may make us feel something mystical.

Comment by BUGGY (C) on May 17, 2015 at 1:23am

Jim Chinese healing chime balls I know what you are saying
But a block of stone won't resonate like a thin piece of steel.
The research on bel chimes is fascinating stuff. went to the bell museum
In france it's amazing how they work and the theory behind them
This is on your train of thought .

Comment by BUGGY (C) on May 16, 2015 at 8:55pm

Jim it strikes me that the bass bar may be the compensation for this issue or sound post position, to correct the wood true tone. I note in a Violin the top is curved and rounded which may also help.But what you have just done looks exactly typical that the luthier has to correct the wood to fix the tone to what he wants.

I think the trail below of various videos links may help explain this, Hope it helps and I sure enjoyed the research.

On the violin I also note these comments below that may help:

The sound post, or "soul post", fits precisely between the back and top, just to the tailward side of the treble bridge foot. It helps support the top under string pressure, and has a variable effect on the instrument's tone, depending on its position and the tension of its fit. Part of adjusting the tone of the instrument is moving the sound post by small amounts, both laterally and along the long axis of the instrument, using a tool called a sound post setter. Since the sound post is not glued and is held in place by string tension and by being gently wedged between the top and back, it may fall over if all the strings are slackened at once.

Running under the opposite side of the bridge is the bass bar. While the shape and mass of the bass bar affect tone, it is fixed in position, and not so adjustable as the sound post. It is fitted precisely to the inside of the instrument at a slight angle to the centre joint. On many German trade instruments it used to be common fashion not to fit a bass bar but to leave a section of the front uncarved and shape that to resemble one. During the baroque era bass bars were much shorter and thinner. Often modern players have asked luthiers to change a baroque bar to a modern one in an old instrument. Occasionally the luthier will refuse to change this feature feeling that it may compromise the instrument.

Comment by BUGGY (C) on May 16, 2015 at 8:39pm

Tap tone & wood qualities.

https://www.youtube.com/watch?v=O10hREMRufU

Comment by BUGGY (C) on May 16, 2015 at 8:31pm

See below how they determine the material resonance, to see if you need to correct it with by thinning or struts

https://www.youtube.com/watch?v=hS8L7xPmtP0

Comment by BUGGY (C) on May 16, 2015 at 8:26pm

This is interesting Jim:

https://www.youtube.com/watch?v=FBuzCRuZwFw

Comment by Sammy Lloyd on May 16, 2015 at 7:23pm

Very interesting clip Jim. Man of many talents

Comment by turtlehead on May 16, 2015 at 1:58pm

Nice to see a problem solving vid like this and good discussion/links.  I'm about to start building for the first time in a while and this is a good reminder that things don't always work out like you plan but there's always a fix.

Comment by James O Lunsford on May 16, 2015 at 12:59pm

Looks Nice Hope the Repair work's for You

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