An audio processing apparatus comprising: a digital-analog conversion unit; an input switch unit (S1, S21), wherein the input switch unit (S1, S21) is controlled based on a control unit, the audio processing apparatus further comprising an extended left audio output terminal; an extended right audio output terminal; a sub-room left audio output terminal; a sub-room right audio output terminal; and an output switch unit (S2, S3), wherein the digital-analog conversion unit is adapted: to receive input of an extended left audio signal and an extended right audio signal in a digital format, and to output the extended left audio signal and the extended right audio signal in an analog format thereby providing a supply of the extended left audio signal and the extended right audio signal in an analog format, or to receive input of a sub-room left audio signal and a sub-room right audio signal in the digital format, and to output the sub-room left audio signal and the sub-room right audio signal in the analog format thereby providing a supply of the sub-room left audio signal and the sub-room right audio signal in an analog format; wherein the input switch unit is adapted to switch between a supply of a combination of the extended left audio signal and the extended right audio signal to the digital-analog conversion unit and a supply of a combination of the sub-room left audio signal and the sub-room right audio signal to the digital-analog conversion unit, and wherein the output switch unit (S2, S3) is adapted to switch between on the one hand both the supply of the extended left audio signal output from the digital-analog conversion unit to the extended left audio output terminal and the supply of the extended right audio signal output from the digital-analog conversion unit to the extended right audio output terminal and on the other hand both the supply of the sub-room left audio signal output from the digital-analog conversion unit to the sub-room left audio output terminal and the supply of the sub-room right audio signal output from the digital-analog conversion unit to the sub-room right audio output terminal. a digital-analog conversion unit; an input switch unit (S1, S21), wherein the input switch unit (S1, S21) is controlled based on a control unit, the audio processing apparatus further comprising an extended left audio output terminal; an extended right audio output terminal; a sub-room left audio output terminal; a sub-room right audio output terminal; and an output switch unit (S2, S3), an extended left audio output terminal; an extended right audio output terminal; a sub-room left audio output terminal; a sub-room right audio output terminal; and an output switch unit (S2, S3), wherein the digital-analog conversion unit is adapted: to receive input of an extended left audio signal and an extended right audio signal in a digital format, and to output the extended left audio signal and the extended right audio signal in an analog format thereby providing a supply of the extended left audio signal and the extended right audio signal in an analog format, or to receive input of a sub-room left audio signal and a sub-room right audio signal in the digital format, and to output the sub-room left audio signal and the sub-room right audio signal in the analog format thereby providing a supply of the sub-room left audio signal and the sub-room right audio signal in an analog format; to receive input of an extended left audio signal and an extended right audio signal in a digital format, and to output the extended left audio signal and the extended right audio signal in an analog format thereby providing a supply of the extended left audio signal and the extended right audio signal in an analog format, or to receive input of a sub-room left audio signal and a sub-room right audio signal in the digital format, and to output the sub-room left audio signal and the sub-room right audio signal in the analog format thereby providing a supply of the sub-room left audio signal and the sub-room right audio signal in an analog format; wherein the input switch unit is adapted to switch between a supply of a combination of the extended left audio signal and the extended right audio signal to the digital-analog conversion unit and a supply of a combination of the sub-room left audio signal and the sub-room right audio signal to the digital-analog conversion unit, and wherein the output switch unit (S2, S3) is adapted to switch between on the one hand both the supply of the extended left audio signal output from the digital-analog conversion unit to the extended left audio output terminal and the supply of the extended right audio signal output from the digital-analog conversion unit to the extended right audio output terminal and on the other hand both the supply of the sub-room left audio signal output from the digital-analog conversion unit to the sub-room left audio output terminal and the supply of the sub-room right audio signal output from the digital-analog conversion unit to the sub-room right audio output terminal.