A transducer device (1) is provided, suitable to be connected to a generator apparatus of alternating electric current and comprising: piezoelectric units (3), suitable to transform the alternating electric current into mechanical vibrations, electrical connections (2) suitable to connect the piezoelectric units (3) to the generator apparatus, a diffuser (7) with a substantially axial symmetric structure and comprising an upper face (7a), in contact with the piezoelectric units (3), and a base face (7b) opposite the upper face (7a) and comprising a first portion (9) placed in proximity of the upper face (7a) and substantially cylindrical and provided with a first diameter smaller than the diameter of the base face (7b).
