Sound box and sound box system

The invention provides a sound box and a sound box system, and aims to realize a multi-sound-channel wide-sound field playing effect through combination of a plurality of independent sound boxes. The sound box system comprises a primary sound box and a secondary sound box, wherein the primary sound box receives audio data, converts the audio data into a first audio signal, outputs the first audio signal, generate a direct-current voltage signal, and overlaps the direct-current voltage signal with the first audio signal to generate a second audio signal, and transmits the second audio signal to the secondary sound box connected with the primary sound box; and the secondary sound box is connected with the primary sound box or a first secondary sound box, receives the first audio signal including a direct-current part and an alternating-current part, performing alternating current-direct current separation on the first audio signal to obtain a first direct-current voltage signal and a second audio signal, determines a target regulation parameter according to the voltage of the first direct-current voltage signal and a corresponding relationship stored in a memory, regulates the second audio signal according to the target regulation parameter to obtain a third audio signal, and outputs the third audio signal.