Usually cars are equipped with disk horns. In these devices electromagnetic energy is converted into mechanical energy
of two nuclei that vibrate and impact each other \u2013 the impacts excite the disk that radiates sound. This paper aims at
understanding the results of acoustic tests carried out on horns with different excitation voltages and different mounting
brackets. Since many non-linear phenomena are inherent in the vibrations of the nuclei, a detailed model of the
electromechanical system is developed. Results show the dependence of operating frequency on the input voltage
and the role played by the various mechanical and electrical parameters on the dynamics of the horn. Particular nonlinear
effects, like sub-harmonic excitation, are presented and discussed. A general agreement between experimental
results and numerical simulations is found
