A system for an automatic determination of equalization filter used for equalization of audio signals reproduced in a vehicle; the system comprising: an audio amplifier having a configurable volume and being configured to reproduce a test signal (t[k]) using at least one loudspeaker arranged in the passenger compartment of the vehicle so as to generate a corresponding acoustic test signal; at least one microphone arranged at least at one desired listening position and configured to sequentially pick up the acoustic test signal at different volume settings of the amplifier as well as a noise signal (n[k]) at different non-acoustical measurement values (SPEED) representing the current state of the vehicle; a signal acquisition and processing system (50, 61, 70) for receiving the measured test and noise signals (s[k]) as well as the corresponding volume and non-acoustical measurement value (SPEED), the signal acquisition processing system (50,61, 70) being configured to: calculate a first power spectral density estimation (PSD t (f; VOL)) of the measured test signal, which depends on the volume, and a second power spectral density estimation (PSD n (f; SPEED)) of the measured noise signal, which depends on the non-acoustical value (SPEED), calculate corresponding first and second masking thresholds (MASK t (f; VOL), MASK n (f; SPEED)), which depend on the volume and, respectively, on the non-acoustical value (SPEED), from the first and second power spectral density estimations (PSD t (f; VOL), PSD n (f; SPEED)); calculate, for each pair of volume and non-acoustic measurement value (VOL, SPEED), a target equalization curve, being composed of the non-negative values of the difference (MASK t (f; VOL)-MASK n (f; SPEED)) between the volume-dependent masking threshold (MASK t (f; VOL)) calculated from the test signal power spectral density (PSD t (f; VOL) and the masking threshold (MASK n (f; SPEED)) calculated from the noise signal power spectral density (PSD n (f; SPEED)), which depends on the non-acoustic value (SPEED); and calculating, for each pair of volume and non-acoustic value (VOL, SPEED), filter parameters of a parameterized filter prototype such that the filter magnitude response approximates the corresponding target equalization curve. an audio amplifier having a configurable volume and being configured to reproduce a test signal (t[k]) using at least one loudspeaker arranged in the passenger compartment of the vehicle so as to generate a corresponding acoustic test signal; at least one microphone arranged at least at one desired listening position and configured to sequentially pick up the acoustic test signal at different volume settings of the amplifier as well as a noise signal (n[k]) at different non-acoustical measurement values (SPEED) representing the current state of the vehicle; a signal acquisition and processing system (50, 61, 70) for receiving the measured test and noise signals (s[k]) as well as the corresponding volume and non-acoustical measurement value (SPEED), the signal acquisition processing system (50,61, 70) being configured to: calculate a first power spectral density estimation (PSD t (f; VOL)) of the measured test signal, which depends on the volume, and a second power spectral density estimation (PSD n (f; SPEED)) of the measured noise signal, which depends on the non-acoustical value (SPEED), calculate corresponding first and second masking thresholds (MASK t (f; VOL), MASK n (f; SPEED)), which depend on the volume and, respectively, on the non-acoustical value (SPEED), from the first and second power spectral density estimations (PSD t (f; VOL), PSD n (f; SPEED)); calculate, for each pair of volume and non-acoustic measurement value (VOL, SPEED), a target equalization curve, being composed of the non-negative values of the difference (MASK t (f; VOL)-MASK n (f; SPEED)) between the volume-dependent masking threshold (MASK t (f; VOL)) calculated from the test signal power spectral density (PSD t (f; VOL) and the masking threshold (MASK n (f; SPEED)) calculated from the noise signal power spectral density (PSD n (f; SPEED)), which depends on the non-acoustic value (SPEED); and calculating, for each pair of volume and non-acoustic value (VOL, SPEED), filter parameters of a parameterized filter prototype such that the filter magnitude response approximates the corresponding target equalization curve. calculate a first power spectral density estimation (PSD t (f; VOL)) of the measured test signal, which depends on the volume, and a second power spectral density estimation (PSD n (f; SPEED)) of the measured noise signal, which depends on the non-acoustical value (SPEED), calculate corresponding first and second masking thresholds (MASK t (f; VOL), MASK n (f; SPEED)), which depend on the volume and, respectively, on the non-acoustical value (SPEED), from the first and second power spectral density estimations (PSD t (f; VOL), PSD n (f; SPEED)); calculate, for each pair of volume and non-acoustic measurement value (VOL, SPEED), a target equalization curve, being composed of the non-negative values of the difference (MASK t (f; VOL)-MASK n (f; SPEED)) between the volume-dependent masking threshold (MASK t (f; VOL)) calculated from the test signal power spectral density (PSD t (f; VOL) and the masking threshold (MASK n (f; SPEED)) calculated from the noise signal power spectral density (PSD n (f; SPEED)), which depends on the non-acoustic value (SPEED); and calculating, for each pair of volume and non-acoustic value (VOL, SPEED), filter parameters of a parameterized filter prototype such that the filter magnitude response approximates the corresponding target equalization curve.