What is the purpose of the divider?
Since almost all current speakers adopt the design method of multi-unit sub-band playback, there must be a device that can divide the full-band music signal sent by the amplifier into treble, bass output or treble, midrange, and bass output as needed. In order to connect with the corresponding speaker unit, the crossover is such a device. If the full-band signal is directly sent to the high, medium, and woofer unit without distribution, the part of the "excess signal" outside the frequency response range of the unit will have an adverse effect on the signal restoration in the normal frequency band, and may even cause The tweeter and midrange unit are damaged. From the perspective of the circuit structure, the frequency divider is essentially an LC filter network composed of capacitors and inductance coils. The treble channel is a high-pass filter, which only allows high-frequency signals to pass through and blocks the low-frequency signals; the bass channel is just the opposite, it Only let the bass pass and block the high-frequency signal; the midrange channel is a band-pass filter, except that the frequency between the two crossover points of one low and one high can pass, high-frequency components and low-frequency components will be blocked. In the actual frequency divider, sometimes in order to balance the sensitivity difference between the high and woofer units, an attenuation resistor is also added; in addition, some frequency dividers also add an impedance compensation network composed of resistors and capacitors, the purpose of which is Make the impedance curve of the speaker psychologically flat, so that it can be driven by the power amplifier.
