i've got a primitive fiddle-like instrument (lira calabrese) that requires me to make my own soundposts. unlike the violin, the sound post is in direct contact with the bridge - a portion of the bridge juts out over the sound hole on the treble side. i understand that pine is the preferred wood to use for these but bamboo seems to work as well.
what's the physics of soundposts? - how do they work? obviously, they transfer vibration from the bridge to the back of the instrument but, regarding the minutia -
- does diameter matter? (is there a maximum and minimum?)
- would a soundpost tapered at the end intensify vibration?
- thin strips of wood are traditionally used for the lira: should it have a point at the end, pressing into the back; a knife-edge or be totally flat and in full contact?
- are round soundposts more effective than flat?
- pine has soft wood between harder grain: through which is the vibration conveyed?
- i read here (hope i have this right) that soundposts are more effective if their grain runs contrary to the bridge grain: does cross grain matched with vertical grain make for better transference or should like be matched with like (vertical grain bridge + vertical grain soundpost?)
i've got a stanley-knife; a heap of pine laths in the studio and winter's coming on - any help would be very much appreciated - thank you.
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