公共广播分室内用箱和室外用箱，一般用来做背景音乐使用，户外多以塑胶假山、音柱等其他各异的造型为主。公共广播的防水处理主要就是箱体塑胶处理，室内使用吸顶喇叭较多，多用在商场，酒店，医院，学校，政府等公共场所。由本身喇叭结构决定，加上公共广播多是定压，这样整体功率不会很大，声压相对较小，动态也小，仅供满足背景音乐的效果。
Public broadcasting can be divided into indoor box and outdoor box, which are generally used for background music, and outdoor box is mainly made of plastic rockery, sound column and other different shapes. The waterproof treatment of public broadcasting is mainly box plastic treatment. There are many ceiling speakers used indoors, which are mostly used in shopping malls, hotels, hospitals, schools, governments and other public places. It is determined by the structure of the loudspeaker itself, and the public broadcasting is mostly constant pressure, so the overall power is not large, the sound pressure is relatively small, and the dynamic is also small, only to meet the effect of background music.