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The top vibrates in many different modes, resonances, so you need to be sure which resonance you are measuring. Further more the free top resonates different from the top that is glued to the sides.
To answer more than you ask for : The tuning of the top, and back and air resonances too for that matter, are just a few parameters that makes the sound in a guitar. It is a very coarse way to express what a guitar sound like and in my opinion only one small piece in the jig saw puzzle that you try to control as a maker. Let me explain why. In a vibrating system a resonance is a function of mass and stiffness. Thus you can achieve the same resonance frequency with different weights and stiffnesses. A light and floppy top can have the same tuning as a stiff and heavy top. It is easy to understand that those two tops would sound different when used on a guitar. So the "tuning of the top" is more complicated than what this simple sentence say; to tune the top is not just tuning it to a certain note, it is to give the top the correct mass and stiffness, in relation to the rest of the instrument, and the purpose of the instrument is important to have in mind too.
I spoke with luthier Robert Hein today, and he said pretty much the same thing.
He's met with quite a few builders, in Spain, too, and they seem to go more by flex, feel, good tap tones, and pushing evenly on the bridge when it's 'boxed' - to see if the flex feels even, proper 'give', etc., rather than any perceived 'tuning' or technique....
He said that one time in Romanilos' class, Mr R. was checking his guitar. He pushed on the bridge, grunted, took some #320, made a few passes on the treble side, pushed again, and said; "Now it is ready..."
He said that one time in Romanilos' class, Mr R. was checking his guitar. He pushed on the bridge, grunted, took some #320, made a few passes on the treble side, pushed again, and said; "Now it is ready..."
Mr. Romanillos checked my soundboard as well when i was in the last years course. He did it by flexing the top. He said that the stiffness of my soundboard was so good that i have to go thinner with the bracing. I did it until he said i can't go any deeper anymore with the bracings. He said that he is sure the guitar will sound very good. Unfortunately i don't yet know whether or not his promise is right. I still have to french polish it but the porefilling of the rosewood is really a hassle. I have in mind to leave the polishing to a professional in order not to mess it up.
ORIGINAL: Armando I still have to french polish it but the porefilling of the rosewood is really a hassle. I have in mind to leave the polishing to a professional in order not to mess it up.
Don't you think you would feel good if you didn't? Take your time and finish it yourself.
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: The tuning of the top, and back and air resonances too for that matter, are just a few parameters that makes the sound in a guitar. It is a very coarse way to express what a guitar sound like and in my opinion only one small piece in the jig saw puzzle that you try to control as a maker. Let me explain why. In a vibrating system a resonance is a function of mass and stiffness. Thus you can achieve the same resonance frequency with different weights and stiffnesses. A light and floppy top can have the same tuning as a stiff and heavy top. It is easy to understand that those two tops would sound different when used on a guitar. So the "tuning of the top" is more complicated than what this simple sentence say; to tune the top is not just tuning it to a certain note, it is to give the top the correct mass and stiffness, in relation to the rest of the instrument, and the purpose of the instrument is important to have in mind too.
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