When playing music, it is difficult to cover all frequency bands with only one speaker due to the capacity and structural limitations of the speaker.If the entire frequency band is sent directly to the tweeter, mid-frequency, and woofer, the “excess signal” that is outside the frequency response of the unit will adversely affect signal recovery in the normal frequency band, and may even damage the tweeter and mid-frequency. Therefore, designers must divide the audio frequency band into several parts and use different speakers to play different frequency bands. This is the origin and function of the crossover.

The crossover is also the “brain” of the speaker, which plays an important role in the quality of sound quality. The crossover “brains” in the amplifier speakers are critical to the sound quality . Audio output from the power amplifier. It must be processed by the filter components in the crossover to allow the signals of specific frequencies of each unit to pass. Therefore, only by scientifically and rationally designing the speaker crossover can the different characteristics of the speaker units be effectively modified and the combination optimized to make the speakers. Unleash the maximum potential, making the frequency response of each frequency band smooth and the sound image phase accurate.

From the working principle, the crossover is a filter network composed of capacitors and inductors. The treble channel only passes high-frequency signals and blocks low-frequency signals; the bass channel is the opposite of the treble channel; the mid-range channel is a band-pass filter that can only pass frequencies between the two crossover points, one low and one high.

The components of the passive crossover are composed of L/C/R, that is, L inductor, C capacitor, and R resistor. Among them, L inductance. The characteristic is to block higher frequencies, as long as the lower frequencies pass, so it is also called a low-pass filter; the characteristics of the C capacitor are just the opposite of the inductance; the R resistor does not have the characteristic of cutting frequency, but is aimed at specific frequency points and The frequency band is used for correction, equalization curve, and sensitivity increase and decrease.

The essence of a passive crossover is a complex of several high-pass and low-pass filter circuits. Passive crossovers seem to be simple, with different designs and production processes. It will make the crossover produce different effects in the speakers.