What is the number of frequency divider?

One can hear the sound frequency range is in between 20Hz — 20kHz, jumbo, use only one speaker is able to guarantee broadcasting 20Hz — 20kHz such wide frequency sound is difficult, because this will technically there all kinds of problems and difficulties. Therefore, in General, high-quality playback systems in order to ensure the reproduction of the sound frequency response and band width, most of the major areas separated by high bass sound playback. And adopts high bass separation type speaker provides sound, they are bound to be on sound isolation by band, the sound according to the frequency of the sound frequency division number is. Sound frequency is largely affected by the speaker of the control, because the vast majority of speakers have their own most suitable frequency range, a real high-quality full-frequency speakers are very rare and extremely expensive price. At the same time in order to overcome the different frequencies of sound speaker distortion caused by the cutting and reduce the same speakers of different speakers sound interference between, you must voice frequency, the sound of different frequency bands will be fed into the different speakers. You can see from the crossover way is divided into two kinds, one kind is an active crossover (PassiveCrossover), or call electronic crossover, or you can call an external crossover, active crossover and a passive crossover (Active Crossover), or call power frequency, or you can call the built-in frequency, passive crossover. Active crossover is a divider is not in the speaker itself, while in power amplifying the voice because at this point until the signal is weak, so easy to sound completely different frequency, the disadvantage is that the appropriate circuit frequency point more fixed, it is not easy and the different speakers, common in high-end and professional audio, with multi-channel power amplifiers, active crossover popularity than previously. Passive crossover is a divider in the speaker, then sound signal has been enlarged, crossover circuit will cause some interference, but speakers can apply to different power amplifier. The most simple frequency is the second frequency, high-frequency and low frequency sound into the crossover point needs to be higher than the maximum frequency of the Bass trumpet 1/2, below the lower limit frequency loudspeaker 2 times the average crossover point between the 2K to 5K. But this crossover is still not enough for bass care, since the bass in order to achieve better results, often requires a separate processing and cut distortion of the speakers on the bass of the greatest and, therefore, becoming more popular in recent three frequency. Three crossover is the sound into the bass, tenor and treble, with two crossover points, the bass frequency point generally 200Hz 120Hz, following, or even lower, treble frequency point usually 2Hz-6KHz. In addition there is also a small amount of four frequency or more crossover system. Obviously more frequency division number theory more conducive to the sound of a restore, but too much crossover point will result in increased overall costs, and actual results improve limited common frequency division number remains second frequency and three frequency.