What is the function of a circuit board in the speaker?

A circuit board in the speaker should be an audio frequency divider (frequency division circuit), which generally exists in a multi-unit passive speaker.

The crossover is the "brain" in the speaker, which is very important to the quality of the sound.

The music signal output by the power amplifier must be processed by each filter element in the frequency divider to allow the signal of a specific frequency of each unit to pass. Only by scientifically, reasonably and rigorously designing the frequency divider of the speaker can we effectively modify the different characteristics of the speaker unit and optimize the combination, so that each unit can maximize its strengths and avoid weaknesses, and fully exert its due potential, so that the frequency response of each frequency band can be changed. Only when the sound is smooth and the phase of the sound image is accurate can the music played by the high, middle and low bass be clearly layered and well-timed, and the clear, comfortable, wide and natural sound quality effect can be achieved.