An audio processing device (1; 20; 21) comprising: at least one connector (2, 7), suitable for receiving an input sound signal corresponding to a plurality of audio channels; a processing module (5, 6) suitable for determining at least one signal intended for a loudspeaker (12, 13) as a function of said sound signal, the device further including a detection module suitable for detecting the proximity of another similar audio processing device and the processing module is suitable for determining said signal intended for the loudspeaker as a function furthermore of a number of other detected device(s); the detection module being suitable for estimating the distance between the device and at least another detected device, the processing module being suitable for determining the signal intended for the loudspeaker as a function of said estimated distance, said determination of the signal done by the processing module (5, 6) comprising: i. selecting a channel from among a plurality of audio channels of the input sound signal as a function of the estimated distance between the device and another detected device; or ii. combining different audio channels of the input sound signal as a function of the estimated distance between the device and another detected device; or iii. selecting frequencies of said combination; the device being characterized in that when the estimated distance between the device and another detected device is inferior to a threshold distance, each device operates in independent mode. at least one connector (2, 7), suitable for receiving an input sound signal corresponding to a plurality of audio channels; a processing module (5, 6) suitable for determining at least one signal intended for a loudspeaker (12, 13) as a function of said sound signal, the device further including a detection module suitable for detecting the proximity of another similar audio processing device and the processing module is suitable for determining said signal intended for the loudspeaker as a function furthermore of a number of other detected device(s); the detection module being suitable for estimating the distance between the device and at least another detected device, the processing module being suitable for determining the signal intended for the loudspeaker as a function of said estimated distance, said determination of the signal done by the processing module (5, 6) comprising: i. selecting a channel from among a plurality of audio channels of the input sound signal as a function of the estimated distance between the device and another detected device; or ii. combining different audio channels of the input sound signal as a function of the estimated distance between the device and another detected device; or iii. selecting frequencies of said combination; i. selecting a channel from among a plurality of audio channels of the input sound signal as a function of the estimated distance between the device and another detected device; or ii. combining different audio channels of the input sound signal as a function of the estimated distance between the device and another detected device; or iii. selecting frequencies of said combination; the device being characterized in that when the estimated distance between the device and another detected device is inferior to a threshold distance, each device operates in independent mode.