An audio system for a vehicle having seat positions (18, 20, 22, 24), said audio system comprising: a set of at least one microphone (602, 604, 606, 608) capable of detecting audio signals; a set of respective loudspeaker arrays (26, 27, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56) each mounted at respective locations with respect to one of a plurality of seat positions and coupled to a microphone of the set of at least one microphone so that the audio signals drive the set of respective loudspeaker arrays to radiate acoustic energy; wherein the set of at least one microphone comprises a first microphone (602, 604, 606, 608) mounted in the vehicle with respect to a first seat position of the plurality of seat positions where an occupant can be seated so that the first microphone detects speech from the first said seat position and outputs signals corresponding to the detected speech; and processing circuitry between the set of at least one microphone and each loudspeaker array of said set of respective loudspeaker arrays, wherein, for the first seat position, the processing circuitry receives the signals corresponding to the detected speech from the first seat position and drives one or more respective loudspeaker arrays of the set of respective loudspeaker arrays at each other seat position (20, 22, 24) of the plurality of seat positions to radiate acoustic energy corresponding to the detected speech, and wherein the processing circuitry processes signals that drive the set of respective loudspeaker arrays at said each other seat position and that correspond to the detected speech so that each loudspeaker array of said set of respective loudspeaker arrays at said each other seat position directionally radiates first acoustic energy to its seat position and directionally radiates second acoustic energy to the first seat position and so that the second acoustic energy is less than the first acoustic energy; characterised in that at least one loudspeaker array of the set of respective loudspeaker arrays located at a second seat position of the plurality of seat positions is aligned between the second seat position and the first seat position, and wherein the processing circuitry is arranged for selectively driving only said at least one aligned loudspeaker array to radiate acoustic energy corresponding to the detected speech to the second seat position. a set of at least one microphone (602, 604, 606, 608) capable of detecting audio signals; a set of respective loudspeaker arrays (26, 27, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56) each mounted at respective locations with respect to one of a plurality of seat positions and coupled to a microphone of the set of at least one microphone so that the audio signals drive the set of respective loudspeaker arrays to radiate acoustic energy; wherein the set of at least one microphone comprises a first microphone (602, 604, 606, 608) mounted in the vehicle with respect to a first seat position of the plurality of seat positions where an occupant can be seated so that the first microphone detects speech from the first said seat position and outputs signals corresponding to the detected speech; and processing circuitry between the set of at least one microphone and each loudspeaker array of said set of respective loudspeaker arrays, wherein, for the first seat position, the processing circuitry receives the signals corresponding to the detected speech from the first seat position and drives one or more respective loudspeaker arrays of the set of respective loudspeaker arrays at each other seat position (20, 22, 24) of the plurality of seat positions to radiate acoustic energy corresponding to the detected speech, and wherein the processing circuitry processes signals that drive the set of respective loudspeaker arrays at said each other seat position and that correspond to the detected speech so that each loudspeaker array of said set of respective loudspeaker arrays at said each other seat position directionally radiates first acoustic energy to its seat position and directionally radiates second acoustic energy to the first seat position and so that the second acoustic energy is less than the first acoustic energy; characterised in that at least one loudspeaker array of the set of respective loudspeaker arrays located at a second seat position of the plurality of seat positions is aligned between the second seat position and the first seat position, and wherein the processing circuitry is arranged for selectively driving only said at least one aligned loudspeaker array to radiate acoustic energy corresponding to the detected speech to the second seat position.