The sound column is a speaker group consisting of a number of identically used speakers mounted in a linear arrangement in a surgical housing. The plane of the sound column is a plane or a curved surface, and the axes of the speakers can be at an angle or on the same plane in the sound column. The acoustic interference phenomenon in the arrangement makes the directivity sharper on a plane extending along the axis. The sound can be sent very far, and the sound field can be obtained evenly at a distance, which improves the efficiency of the sound reinforcement system, prevents whistling and reduces echo, and is suitable for occasions such as squares and halls.
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