Unlimited speakers can be divided into main playback speakers according to their uses. Monitor speakers and listen back speakers, etc. Main speaker: generally used as the main speaker of the sound system, it undertakes the primary playback mission. Monitor speaker: It is used for program monitoring in the control room and recording room. It has the characteristics of small distortion, wide and straight frequency response, and little touch up on the signal, so it can most truly reproduce the original appearance of the program.

Recirculation speaker: also known as stage monitoring speaker, it is generally used on the stage or in the dance hall for artists or band members to monitor their own singing or playing sounds. According to the box structure, it can be divided into sealed speakers, inverted speakers, labyrinth speakers, sonic tube speakers and multi cavity resonant speakers.

The most commonly used professional speakers are the inverted phase speakers, which are characterized by wide frequency response, high power, and high sound pressure, matching the type of professional sound system speakers. However, because of their low power, they are rarely used in professional speakers, primarily for household speakers, as long as a small number of monitoring speakers use the closed box structure.

Sealed speakers have the advantages of simple debugging for planning and manufacturing, wide frequency response, good low-frequency transient characteristics, etc., but they have high requirements for the sounder unit. In all kinds of speakers, the inverted and sealed speakers account for the majority of the shares, while the structure of other types of speakers is complex, but the share is small.