A macrosonic generator by air for the mechanical breakage of high consistency bubbles constituting industrial foams, wherein it consists of a power electroacoustic transducer and an electronic generator device for controlled excitation thereof, for the control and monitoring of the resonance frequency of the transducer, for the constant maintenance of the power supplied to the transducer, and a titanium radiator in the form of a plate with an emitting face and a non-emitting face, each having a discontinuous profile, wherein the power electroacoustic transducer consists of an extensionally vibrating piezoelectric or magnetostrictive transduction element which is configured to act as an exciter of the radiator in the form of a plate with a discontinuous profile specifically designed for maximising the power capacity in the generation of focused acoustic fields, and reducing the weight of the titanium radiator, wherein the radiator is a plate of large area with non-homogenous thickness which vibrates in one of its flexural modes, the profile of the emitter face of the plate is designed to obtain focused fields by relatively displacing internodal zones of the plate in such a way that the radiation arrives in phase, the profile of the non-emitting face of the radiating plate is designed by slimming down a thickness of the peripheral internodal zones of the plate and maintaining and/or slightly modifying a thickness of the central internodal zones of the plate in such a way that the distribution of the maximum displacements is homogenised, being maximised in the peripheral zones of the plate and moderated in the central zones of the plate, the electronic generator device includes a PLL (Phase locked loop) circuit consisting of a voltage controlled oscillator, a four quadrant multiplier acting as a phase comparator and a low pass filter, with three control loops, implemented by means of a processor, a first loop for controlling the output power, a second loop for controlling the working frequency band and a third loop for controlling the phase between the output current and voltage. the radiator is a plate of large area with non-homogenous thickness which vibrates in one of its flexural modes, the profile of the emitter face of the plate is designed to obtain focused fields by relatively displacing internodal zones of the plate in such a way that the radiation arrives in phase, the profile of the non-emitting face of the radiating plate is designed by slimming down a thickness of the peripheral internodal zones of the plate and maintaining and/or slightly modifying a thickness of the central internodal zones of the plate in such a way that the distribution of the maximum displacements is homogenised, being maximised in the peripheral zones of the plate and moderated in the central zones of the plate, the electronic generator device includes a PLL (Phase locked loop) circuit consisting of a voltage controlled oscillator, a four quadrant multiplier acting as a phase comparator and a low pass filter, with three control loops, implemented by means of a processor, a first loop for controlling the output power, a second loop for controlling the working frequency band and a third loop for controlling the phase between the output current and voltage. <EOS>