Abstract: The present invention provides a broad spectrum frequency variable horn arrangement which includes a power supply means, at least two electronic signal generating means driven by said power supply means, with each signal generating means adapted to provide square wave pulsed voltage output of selected amplitude and different frequency periods. Mixing means are provided to additively mix the instantaneous output of each of the signal generating means and means to supply the mixed signal to an audible sound generator means where the amplitude and frequency of the generated audible sound corresponds to the signal received by the mixing means.