An audio system comprising: a plurality of speakers (110, 120, 130) configured to output multichannel audio signals; an interface configured to receive a plurality of test tone signals from each speaker of said plurality of speakers (110, 120, 130); a channel determiner configured to analyze the plurality of received test tone signals to determine locations of the plurality of speakers, and generate a determination result based on the determined locations; a switch configured to sequentially output a test tone as a sound signal to the plurality of speakers, generate a channel mapping and map channels through which the multichannel audio signals are output to respective output terminals to which the speakers are connected according to the determination result; and an output unit comprising said output terminals to which the speakers are connected and configured to be randomly connected to the plurality of speakers, and output the multichannel audio according to the channel mapping performed by the switch, the system characterized in that: one of the plurality of speakers is a center speaker that includes a plurality of microphones (110a, 110b) configured to receive the test tone sequentially output from the plurality of speakers (120, 130), thereby generating said plurality of test tone signals, whereas others of the plurality of speakers do not include a microphone, and the channel determiner is configured to use timing of when the test tones are received at one of the microphones (110a, 110b) to determine the locations of the others of the plurality of speakers in relation to the center speaker. a plurality of speakers (110, 120, 130) configured to output multichannel audio signals; an interface configured to receive a plurality of test tone signals from each speaker of said plurality of speakers (110, 120, 130); a channel determiner configured to analyze the plurality of received test tone signals to determine locations of the plurality of speakers, and generate a determination result based on the determined locations; a switch configured to sequentially output a test tone as a sound signal to the plurality of speakers, generate a channel mapping and map channels through which the multichannel audio signals are output to respective output terminals to which the speakers are connected according to the determination result; and an output unit comprising said output terminals to which the speakers are connected and configured to be randomly connected to the plurality of speakers, and output the multichannel audio according to the channel mapping performed by the switch, the system characterized in that: one of the plurality of speakers is a center speaker that includes a plurality of microphones (110a, 110b) configured to receive the test tone sequentially output from the plurality of speakers (120, 130), thereby generating said plurality of test tone signals, whereas others of the plurality of speakers do not include a microphone, and the channel determiner is configured to use timing of when the test tones are received at one of the microphones (110a, 110b) to determine the locations of the others of the plurality of speakers in relation to the center speaker. one of the plurality of speakers is a center speaker that includes a plurality of microphones (110a, 110b) configured to receive the test tone sequentially output from the plurality of speakers (120, 130), thereby generating said plurality of test tone signals, whereas others of the plurality of speakers do not include a microphone, and the channel determiner is configured to use timing of when the test tones are received at one of the microphones (110a, 110b) to determine the locations of the others of the plurality of speakers in relation to the center speaker.