Nonlinear effects in horn drivers are the inseparable part of the principle of their operation. In addition to the distortion caused by electrodynamic and mechanical effects, the distortion is generated in the compression chamber by the nonlinear adiabatic compression, modulation of the air's mechanical stiffness, mass, and viscous losses, and by the nonlinear relationship between the particle velocity and the sound pressure. A new more accurate nonlinear model of compression chamber has been developed. A significant part of distortion is generated in the phasing plug and the horn due to the nonlinear propagation of the high pressure sound waves. Quantitative comparison of nonlinear effects in compression chamber and horn is carried out. Comparison is performed by using such criteria as harmonic distortion and two-tone intermodulation distortion.
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