Abstract: A system which corrects for adverse characteristics such as reactance, inertia and resonances of a power amplifier driven load such as a speaker or multiple speaker system. Program voltage is applied to a reference load which has electrical characteristics which simulate characteristics of the driven load, and the response of the reference load to the program is used to develop a correction voltage signal for the driven load. The program and the correction voltage signal are simultaneously applied to the power amplifier to simultaneously reproduce the program and correct for the adverse characteristics of the load.