mark indigo -> RE: Checking "intonation"? (Nov. 29 2012 16:42:39)
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quote:
exactly what is 'string intonation' in addition to the problems of dud or different strings, there is also the issue of compensation. I'm no expert, so I hope the luthiers will forgive (and correct) any inaccuracies, but this is roughly how it was explained to me: The 12th fret is half way between the bridge and the nut, which is why the note at the 12th fret is an octave higher than the open string. Except it's not! The 12th fret would be half way between the bridge and the nut if the strings where at the same level as the wood of the neck, in which case they would buzz and you wouldn't get clear notes. As you have to have the strings up off the wood of the neck to get actual notes, you then have to move the bridge back a little bit to compensate for the height of the action. On classical guitars with higher action, the bridge is moved further back than on flamenco guitars with lower action (a generalisation of course). I once had a flamenco guitar with low-ish action that did not intonate properly. It was eventually diagnosed that the bridge was too far back, as if it were a classical guitar with higher action. The solution was to cut out some wood from the bridge in front of the bridge bone, move the bone forward, and fill in behind it. Problem solved!
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