The diaphragm and the spider and the horn which consist of the balsa lumber or the device for electric acoustic diffusion which has those mixed unions

摘要

(57) Abstract The device for electric acoustic diffusion by this invention, the diaphragm (2) and the spider (3) and has with join horn (11 or 12), everything consists of the balsa lumber or those mixed unions, it is natural and it is possible to regenerate the timbre whose feeling is good.