Professional speakers are basically composed of three parts: speakers, crossovers, and cabinets. According to the number of speakers, it is divided into two units (RCF units) and three units. Another is to make the tweeter and the woofer into one, called a coaxial unit, which looks like one unit from the outside, but is actually still two units.

The frequency divider, as the name implies, divides the frequency band [20--20000Hz] of the audible sound into several frequency bands and sends them to the corresponding speaker units respectively. According to how much the frequency band is divided into, it is divided into high and low

Two-stage is called two-way divided into high, medium and low three-stage called three-way, and so on.

The box is generally made of logs or medium density boards. According to the structure of the box, it is divided into a closed box [without a phase inversion hole, the air inside the box is insulated from the outside], and an inverted box [with a phase inversion hole]. There are also some less common box structures: labyrinth, exponential, negative resistance, horn, etc.

According to the scope of use of speakers, it is divided into: professional box [used for performance, hall, hall, venue, hall sound reinforcement]