The acoustic emmission device

An acoustic sound output device is provided to realize a sound field for the taste of a listener by changing directivity of an acoustic wave emitted from a speaker unit by enabling the listener to control the angle of the speaker unit freely. A connection connector(220) is inserted into a connection port of a mobile device, and receives a power supply voltage and an audio signal. A speaker unit(100) outputs an electric signal transferred through the connection connector as an audio signal. A baffle(200) accommodates the speaker unit. A connection unit(210) is installed in the baffle. A wire transmits an electric signal by connecting the speaker unit from the connector.