An audio system for a vehicle, the system being configured for reproducing audio signals and comprising: a signal processor having a finite maximum number of processing channels, said finite maximum number being at least two; and an audio controller unit configured to dynamically assign each of a plurality of audio sources to separate ones of the processing channels of the signal processor in response to requests received by the audio system to reproduce the audio signals from the audio source, wherein: the audio system is configured to be simultaneously connected, via the audio controller, to a number of audio sources that exceeds the maximum number of processing channels; each of the audio signals are labelled so that the audio system is capable of determining an identity of the audio signal wherein the identity of the audio signal comprises information relating to the type and/or source and/or quality of the audio signal and wherein the identity is determined by reading an identifier contained in a header of a digital audio signal; the signal processor is configured to automatically select, in dependence upon the identity of each of the audio signals assigned to the processing channels, processing settings to assign to the processing channels that are for use by the signal processor in independently processing each of the audio signals in each of the processing channels prior to combining said audio signals; and the audio system is configured to change the processing settings for a processing channel in response to a change in the identity of the audio signal assigned to that processing channel; wherein each of the processing settings defines filtering characteristics of one or more filters of an equalisation sub-block used by the signal processor in independently processing each of the audio signals to adapt a frequency response of the audio signal, such that each of the audio signals is subjected to equalisation processing according to its type and/or source and/or quality. a signal processor having a finite maximum number of processing channels, said finite maximum number being at least two; and an audio controller unit configured to dynamically assign each of a plurality of audio sources to separate ones of the processing channels of the signal processor in response to requests received by the audio system to reproduce the audio signals from the audio source, wherein: the audio system is configured to be simultaneously connected, via the audio controller, to a number of audio sources that exceeds the maximum number of processing channels; each of the audio signals are labelled so that the audio system is capable of determining an identity of the audio signal wherein the identity of the audio signal comprises information relating to the type and/or source and/or quality of the audio signal and wherein the identity is determined by reading an identifier contained in a header of a digital audio signal; the signal processor is configured to automatically select, in dependence upon the identity of each of the audio signals assigned to the processing channels, processing settings to assign to the processing channels that are for use by the signal processor in independently processing each of the audio signals in each of the processing channels prior to combining said audio signals; and the audio system is configured to change the processing settings for a processing channel in response to a change in the identity of the audio signal assigned to that processing channel; the audio system is configured to be simultaneously connected, via the audio controller, to a number of audio sources that exceeds the maximum number of processing channels; each of the audio signals are labelled so that the audio system is capable of determining an identity of the audio signal wherein the identity of the audio signal comprises information relating to the type and/or source and/or quality of the audio signal and wherein the identity is determined by reading an identifier contained in a header of a digital audio signal; the signal processor is configured to automatically select, in dependence upon the identity of each of the audio signals assigned to the processing channels, processing settings to assign to the processing channels that are for use by the signal processor in independently processing each of the audio signals in each of the processing channels prior to combining said audio signals; and the audio system is configured to change the processing settings for a processing channel in response to a change in the identity of the audio signal assigned to that processing channel; wherein each of the processing settings defines filtering characteristics of one or more filters of an equalisation sub-block used by the signal processor in independently processing each of the audio signals to adapt a frequency response of the audio signal, such that each of the audio signals is subjected to equalisation processing according to its type and/or source and/or quality.