Acoustic device for piano e.g. grand piano, has contact cord support that is established by set of staples, zero or neglible load and sounding board with less than six stiffeners, where sounding board is provided with zero loads

摘要

The device has a contact cord support that is established by a set of staples, a zero or neglible load and a sounding board with less than six stiffeners. The sounding board is provided with zero load. A set of cords is arranged in contact with each other. The sounding board is arranged with a set of spruce panels that is provided with non-constant pianos and is deprived or bars.