The invention concerns an acoustic device with electro-acoustic transducers and with a cavity resonator that provide extreme tri-dimensional to concentrate/diffuse infrasonic, sonic and ultrasonic waves. It also concerns many structural designs in which some models of cavity resonators and all their transducers are appropriately arranged on the basis of the different uses; so doing it is possible to achieve numerous interacting operational set-ups (basic configuration systems) that can be used in the medical sector, in industry or in the home, in entertainment and leisure. Differently to previously known techniques the acoustic device according to this patent is also a highly sophisticated cybernetic apparatus for the reproduction of various tri-dimensional sound fields that are identical to the original ones, or for generating completely new ones. This acoustic device can be compared to a Helmholtz resonator that transmits sound-waves/harmonic frequencies rather than receiving them.