Crossover Networks for Loudspeakers

Most loudspeakers use multiple drivers and employ crossover networks to route the appropriate frequency ranges to the different drivers.

Crossover Elements

The capacitor has lower impedance for high frequencies. It acts to block low frequencies and let high frequencies through. 电容器对高频有较低的阻抗。它能阻止低频信号通过，而让高频信号通过。		High-pass filter. 高通滤波器
The inductor has a lower impedance for low frequencies. It acts to block high frequencies and let low frequencies through. 电感器在低频时阻抗较低。它会阻止高频信号通过，而让低频信号通过。		Low-pass filter. 低通滤波器
A capacitor and inductor in series act to block both very high and very low frequencies. 电容器和电感器串联时，能阻止非常高的和非常低的频率。		Band-pass filter. 带通滤波器

Two-Way Crossover

Combinations of capacitors, inductors, and resistors can direct high frequencies to the tweeter and low frequencies to the woofer. This amounts to filter action. A two-way crossover network divides the frequency range between two speakers.

Three-Way Crossover

Combinations of capacitors, inductors, and resistors can direct high frequencies to the tweeter and low frequencies to the woofer. This amounts to filter action. A three-way crossover network divides the frequency range between three speakers.

A capacitor has lower impedance for high frequencies. In series with the high frequency speaker (tweeter), it acts to block low frequencies and let high frequencies through.

The inductor has a lower impedance for low frequencies. In series with the low-frequency speaker (woofer), it acts to block high frequencies and let low frequencies through.