External speaker assembly and audio apparatus

An external speaker assembly, comprising a housing, a speaker unit and a driving circuit;

• wherein the housing comprises a main body in shape of a horn, and a cover plate covering a larger opening of the main body;
• the driving circuit is carried on the cover plate;
• the driving circuit comprises a first terminal, a second terminal, a third terminal and a fourth terminal;
• the external speaker assembly is detachably connected to an audio device;
• when the external speaker assembly is connected to the audio device, a sealed cavity is formed by the housing and a rear cover of the audio device;
• the speaker unit and the driving circuit are received in the sealed cavity;
• the third terminal is connected to a third interface of the audio device to receive power from the audio device;
• the second terminal is connected to a second interface of the audio device to send a feedback signal to the audio device, in such a way that the audio device determines whether it is externally connected to the external speaker assembly at present based on the feedback signal;
• the fourth terminal is connected to a fourth interface of the audio device to receive a control signal from the audio device, and the control signal is configured to control the external speaker assembly to turn on or off;
• the first terminal is connected to a first interface of the audio device to receive an audio signal from the audio device to drive the speaker unit to produce sounds.