A sound system including multi-channel wireless speakers according to the present invention, by means of a processor: monitors the state of power supply to each of a plurality of sound output devices arranged in a space; detects, as a result of the monitoring, the position of a first sound output device satisfying a preset state condition among the plurality of sound output devices; selects, on the basis of the detected position, a second sound output device with which to perform a sound compensation operation; and performs a sound compensation operation for the first sound output device by using the selected second sound output device. Accordingly, more optimal acoustics can be continuously provided even when the power supply to a portion of combined/arranged wireless speakers is insufficient.