A method of configuring an audio system comprising one or more speaker units, comprises: transmitting radio signals from at least a first location indicating a first speaker unit position, and from a second location indicating a second speaker unit position or a user position; receiving the signals at an antenna of the audio system; calculating an angle of arrival of the signals at the antenna; calculating the relative positions of the first and second locations based at least partially on the angle of arrival; and configuring the audio system based on the relative positions of the first and second locations.