Loudspeaker driver systems

The system comprises a modulator 120 configured to receive an input signal and to output a pulse width modulated (PWM) signal representative of the received input signal. A delay element 130, 140 applies delays to the PWM output signal to generate a first delayed signal 154 coupled to a second voice coil 114 and a second delayed signal 156 coupled to a third voice coil 116. An undelayed output signal 152 is coupled to a first voice coil 112. The system can be regarded as a FIR filter that may be used to suppress a carrier frequency of the PWM signal. The FIR filter may receive a configuration signal (fig 7) that causes the filter to adapt to a change in the frequency of the PWM signal.