Divided into two, the sound is divided into high frequency and low frequency. The demarcation point needs to be higher than 1/2 of the upper limit frequency of the woofer and lower than twice of the lower limit frequency of the tweeter. The general demarcation point is between 2K and 5K. However, this frequency division is not perfect for bass nursing, because bass often needs to be treated separately to get better results, and the cutting distortion of speakers has the greatest influence on bass, so the three-frequency division has gradually become popular in recent years.

Tri-frequency division is to divide the sound into bass, alto and treble, and there are two dividing points. The bass cut-off point is generally below 200Hz, or 120Hz, or even lower, and the treble cut-off point is generally between 2 Hz and 6 khz. In addition, there are a few four-frequency or multi-frequency systems. Obviously, more frequency division numbers are more conducive to sound restoration in theory, but too many frequency division points will increase the overall cost and the actual effect is limited, so the common frequency division numbers are still divided into two and three.

From the perspective of layering, it is definitely better to divide the frequency into three segments, because the average listening frequency of human ears is concentrated in the middle frequency band, and the three-segment frequency division has a separate midrange speaker, which is very suitable.