An active noise attenuation system (100; 300) for cancelling road noise in a vehicle cabin comprising: an electro-acoustic transducer; a noise sensor for providing a noise signal indicative of road noise; a first fixed filter configured to modify the amplitude and/or phase of the noise signal thereby to provide an attenuation signal, wherein the first fixed filter models and accommodates for an expected transfer function of the electro-acoustic transducer as well as a transfer function of an acoustic path between the electro-acoustic transducer and an expected position of an occupant's ears; a microphone arranged and configured to sense acoustic energy emitted by the electro-acoustic transducer and to provide a microphone signal corresponding to the sensed acoustic energy; a second fixed filter configured to filter the attenuation signal and to provide a second filtered attenuation signal, wherein the second fixed filter comprises a transfer function which corresponds to an estimate of the transducer to microphone transfer function; an adaptive filter having a transfer function controlled by a set of variable filter coefficients, the adaptive filter being arranged and configured to filter the attenuation signal and to provide a first filtered attenuation signal to the electro-acoustic transducer for transduction to acoustic energy for attenuating the road noise in the vehicle cabin at the expected position of the occupant's ears; and a coefficient calculator configured to accommodate for variations in the transfer function of the electro-acoustic transducer by updating the set of variable filter coefficients based on the microphone signal and the second filtered attenuation signal. an electro-acoustic transducer; a noise sensor for providing a noise signal indicative of road noise; a first fixed filter configured to modify the amplitude and/or phase of the noise signal thereby to provide an attenuation signal, wherein the first fixed filter models and accommodates for an expected transfer function of the electro-acoustic transducer as well as a transfer function of an acoustic path between the electro-acoustic transducer and an expected position of an occupant's ears; a microphone arranged and configured to sense acoustic energy emitted by the electro-acoustic transducer and to provide a microphone signal corresponding to the sensed acoustic energy; a second fixed filter configured to filter the attenuation signal and to provide a second filtered attenuation signal, wherein the second fixed filter comprises a transfer function which corresponds to an estimate of the transducer to microphone transfer function; an adaptive filter having a transfer function controlled by a set of variable filter coefficients, the adaptive filter being arranged and configured to filter the attenuation signal and to provide a first filtered attenuation signal to the electro-acoustic transducer for transduction to acoustic energy for attenuating the road noise in the vehicle cabin at the expected position of the occupant's ears; and a coefficient calculator configured to accommodate for variations in the transfer function of the electro-acoustic transducer by updating the set of variable filter coefficients based on the microphone signal and the second filtered attenuation signal.