Hi - thanks for writing. Please excuse my ignorance, as I know nothing of physics. Would a speaker create this effect w/o producing any noise itself? Is there something inherent about a loud speaker that, if attached to the bottom of the piano sound board, would cause the strings to vibrate...
I would like to build an electro magnet capable of causing piano strings to vibrate without the strings being struck first. As long as the hammers are up, the strings would vibrate on their own accord.
An E-bow, used by guitarist for the same purpose, will (sort of) work on a limited range on...