first violin spectrum... Nicolo Amati model

[Marty Kasprzyk]

Hi HoGo,

I suggested relatively narrow and thin strips of wood so they could easily bend to the inside surface of the plate.  You could place these right next to one another to cover the entire bridge island area if necessary.  The intent is indeed to increase the cross grain stiffness.

Attached is a paper by Erik Jansson and Benedykt Niewczyk which describes the effects of adding various strips of wood.  They added all of them first and then removed them in several steps to see how the frequency response curves change.

The strips boosted the high end and lowered the low end--the entire curve shifts.I suggest doing something similar but stopping when you get a sound you like.  

Keep calm, carry on,

Marty

 

[Seán Ó Fearghail]

30 minutes ago, Marty Kasprzyk said:

Hi HoGo,

I suggested relatively narrow and thin strips of wood so they could easily bend to the inside surface of the plate.  You could place these right next to one another to cover the entire bridge island area if necessary.  The intent is indeed to increase the cross grain stiffness.

Attached is a paper by Erik Jansson and Benedykt Niewczyk which describes the effects of adding various strips of wood.  They added all of them first and then removed them in several steps to see how the frequency response curves change.

The strips boosted the high end and lowered the low end--the entire curve shifts.I suggest doing something similar but stopping when you get a sound you like.  

Keep calm, carry on,

Marty

 

Thanks guys. I did some fettling, thinned out the bridge a little, now 1.8g and I'm a good bit happier.  I decided to try some light impact tapping to isolate some frequencies as suggested in plate tuning.org and these were the peaks for A0, B1- etc. 

I know its only a small parts of the story but for anyone interested.. 

[Don Noon]

36 minutes ago, ofearghail7 said:

...these were the peaks for A0, B1- etc. 

I know its only a small parts of the story but for anyone interested.. 

Very normal frequencies, which could be found on great violins... or really poor ones as well.  But at least it's not abnormal.

[Seán Ó Fearghail]

1 hour ago, Don Noon said:

Very normal frequencies, which could be found on great violins... or really poor ones as well.  But at least it's not abnormal.

Thanks Don. I suppose thats the fun of it. We'll  move onto the next one. And maybe find some nicer wood/ watch the thicknesses more carefully.