A device (1) is arranged for adjusting the amplitude of an audio signal (x) such that the output of a transducer (2) coupled to the device is equivalent to the output of a reference transducer. The device comprises a first simulation unit (11) for producing a reference signal (y) in response to the audio signal (x), a second simulation unit (12) for producing a further signal (z) in response the audio signal (x), and comparator means (15) for comparing the reference signal (y) and the further signal (z) so as to produce an adjustment signal (a) which is fed to an adjustment unit (10). The first simulation unit (11) simulates the response of a reference transducer, while the second simulation unit (12) simulates the response of the actual transducer (2) to the audio signal (x).