The frequency divider is to distinguish the sound signals of different frequency bands, respectively give amplification, and then send them to the speakers of the corresponding frequency bands for playback. In high quality sound reproduction, electronic crossover processing is required. The crossover is a kind of circuit device in the speaker, which separates the input analog audio signal into different parts such as treble, midrange and bass, and then respectively sends them into the corresponding high, medium and low woofer units for playback. The reason for this is that no single speaker can perfectly reproduce the full frequency of the sound. The crossover is the "brain" in the speaker, which is very important for the sound quality. The music signal output by the power amplifier must be processed by the filter wave component in the frequency divider to allow the signals of specific frequencies of each unit to pass. It is necessary to scientifically design, rationally and rigorously design the frequency divider of the speaker to effectively modify the different characteristics of the speaker unit, optimize the combination, so that each unit can develop its strengths and avoid weaknesses, and exert its potential as much as possible to make the frequency response of each frequency band change. Smooth, accurate phase of the sound image, in order to make the music played by high, medium and low sounds clear, co-ordinated, clear, comfortable, wide and natural sound quality. In a speaker system, people refer to the box, frequency dividing circuit, and speaker unit as the three major parts of the speaker system, and the frequency divider is the "brain" in the speaker. The frequency dividing circuit can restore the speaker system with high quality. Electroacoustic signals play an extremely important role. Especially in the middle and high frequency parts, the role played by the frequency dividing circuit is more obvious. Frequency division Regardless of the type of frequency divider's main functions and tasks, of course, it is still divided. Since there are many types of speakers, what function is used in the system, and the frequency dividers are still flexible. The frequency dividers that are commonly used now have a divide by 2, a divide by 3, and a divide by 4. More than 4 divides is too complicated and meaningless. The frequency divider can reasonably perform power distribution of each unit so that the units have an appropriate phase relationship to reduce the acoustic interference distortion of each unit during operation. Protection speaker The operating frequency of different speakers is different. Generally speaking, the larger the aperture, the better the low frequency characteristics and the lower the frequency dive. The crossover can provide the optimal operating frequency required by different speakers to compensate for the acoustic defects of the unit in a certain frequency band, so that various speakers can work more reasonably and safely. Therefore, in addition to the crossover task, the frequency divider has the most important functions of its normal use: to protect the speaker equipment. Increase the level of sound If there are many different types of speakers in an audio system, and there is no crossover, there will be a lot of overlapping and repeating parts between different speakers. The sound interference will become very serious and the sound will become Unclear. If the frequency system is used in the audio system to make a reasonable frequency division, so that different speakers are in the best working condition, the sound frequency range between different speakers will be almost never repeated, and the interference of sound waves will be reduced. The sound will become extraordinarily clear and the tone will be better and more layered. From the circuit structure point of view, the frequency divider is essentially an LC filter network composed of a capacitor and an inductor coil. The high-pitched channel is a high-pass filter, which only allows high-frequency signals to pass through and blocks low-frequency signals; the bass channel is just the opposite, it only allows The bass passes through to block the high-frequency signal; the mid-range channel is a band-pass filter, except that the frequency between the two low-high and high-frequency points can pass, and both the high-frequency component and the low-frequency component are blocked. In the actual crossover, sometimes in order to balance the sensitivity difference between the high and low woofer units, attenuating resistors are added; in addition, some frequency dividers also include an impedance compensation network composed of resistors and capacitors. Make the impedance curve of the speaker more flat to facilitate the amplifier drive. Since most of the current speakers use a multi-cell sub-band playback design, there must be a device that can divide the full-band music signal sent by the power amplifier into high-pitched, low-pitched or high-pitched, mid-range, and low-range outputs as needed. In order to connect with the corresponding speaker unit, the frequency divider is such a device. If the full-band signal is directly sent to the high, medium, and low-range units without distribution, the portion of the "excess signal" outside the range of the unit's frequency response will adversely affect the signal reduction in the normal frequency band, and may even make The treble and midrange units are damaged. Power divider: located behind the power amplifier, set in the speaker, through the LC filter network, the power audio signal output by the power amplifier is divided into bass, midrange and treble, respectively sent to their respective speakers. The connection is simple and convenient to use, but the power consumption, the audio valley point, the cross distortion, the direct relationship between the parameters and the speaker impedance, and the impedance of the speaker is a function of the frequency, which deviates greatly from the nominal value, so the error Also larger, not conducive to adjustment. Electronic crossover: A device that divides the audio weak signal. It is located in front of the power amplifier. After dividing the frequency, each independent audio amplifier is used to amplify each audio frequency band signal and then sent to the corresponding speaker unit. Due to the small current, it can be realized with a smaller power electronic active filter, which is easier to adjust, reduce power loss, and interference between speaker units. The signal loss is small and the sound quality is good. However, this method uses an independent power amplifier for each path, which has high cost and complicated circuit structure, and is applied to a professional sound reinforcement system. Shenzhen Kaixuanye Technology Co., Ltd. , https://www.iconline-kxy.com
Power divider 
Electronic crossover