(Jon of the Clue Crew reports from Steinway and Sons.) It's the ten-letter term for the piano's diaphragm; it's made flexible enough to vibrate, but strong enough to handle a thousand pounds of force from over 200 strings
It's the 
ten-letter term for the piano's diaphragm; it's made flexible enough to vibrate, but 
strong enough to handle a thousand pounds of force from over 200 strings | 
soundboard.