Abstract: A signal-processing circuit for the generation of a loudspeaker signal comprises an input for the feeding of a digital input signal and a digital equalizer filter that is coupled with the input and has at least one first recursive filter that is defined by a first adjustable set of coefficients. An amplification device coupled with the equalizer filter is designed to generate the loudspeaker signal as a function of the filtered input signal and to output on an output terminal. A current measurement device is designed to output a digital measurement signal that represents a current of the loudspeaker signal. A digital filter block is designed to generate, through filtering, an estimate signal as a function of the measurement signal. For this purpose, the filter block has at least one second recursive filter that is defined by a second adjustable set of coefficients.