Juke winding machine manufacturers specializing in the production of audio crossover coil winding machine
The speaker divider is a combined filter that splits the sound signal into frequency bands. For example, the divide-by-2 is composed of a high-pass filter and a low-pass filter. A three-way frequency band adds another bandpass filter. The crossover is the "brain" in the speaker, which is very important for the sound quality.
Overview of speaker dividers
Problems with the use of the crossover The audio technology crossover is an audio device that divides the sound signal into several frequency bands. We know that the frequency range of the sound is between 20Hz and 20kHz. It is hoped that using only one speaker will ensure that a wide frequency sound such as 20Hz-20kHz is difficult to achieve, because this will be technically different. A variety of problems and difficulties. Therefore, under normal circumstances, in order to ensure the frequency response and the frequency bandwidth of the reproduced sound, in the professional range, the high-bass split speaker is mostly used for sound reproduction, and when the high-bass split type speaker is used for sound transmission, It is necessary to use a frequency divider.
Speaker divider structure
The speaker crossover adopts the structure of the following figure, and the specific analysis:
The circuit that connects the tweeter: let the current flow through the capacitor first, block the low frequency, let the high frequency pass, and the horn is connected in parallel with a coil to make the coil generate a negative voltage. This voltage is just a voltage compensation for the tweeter, so it can The sound current is reduced approximately realistically.
Connect the woofer circuit: the current flows through the coil first, so that the high frequency part is blocked, and the low frequency band passes smoothly because the coil is basically not obstructed. Similarly, the woofer is connected in parallel with a capacitor, which is to use the capacitor to generate a high frequency. The voltage is used to compensate for the lost voltage, which is the same as the tweeter.
It can be seen that the characteristics of the capacitor and the coil that are fully utilized by the frequency divider are divided. However, the coil and the capacitor still consume the voltage in the respective blocked frequency bands, so the circuit divider will lose a certain sound, and there are many compensation measures. Because the author has insufficient knowledge, it is difficult to say clearly. The electronic crossover solves this problem. When the sound is input to the power amplifier, the frequency is divided first, and then a special amplifier circuit is used to amplify the different frequency bands, so that the sound distortion is small and the reproduction is realistic. But the circuit is complicated and expensive.
The role of the speaker crossover
1. Make all kinds of speakers work in the most suitable audio segment
Speakers with different diaphragm sizes and materials have different optimal operating bands. The louder the speaker, the better the low frequency characteristics. Therefore, under the same conditions, the 18-inch bass effect is definitely better than the 15-inch bass effect.
The better the rigidity and brittleness of the diaphragm material, the lighter the quality, the better the high frequency characteristics of the sound reproduction. Many tweeters use titanium or indium as the diaphragm material to improve their high-frequency characteristics. The diaphragm of the woofer generally uses materials such as paper, carbon fiber, bulletproof cloth and rubber (edge) to facilitate bass reproduction.
The frequency divider can be used to send high-frequency signals to the tweeters, and the low-frequency signals are sent to the woofer. The high- and low-frequency signals are used in different ways, and the operating band advantages of the respective speakers are utilized as much as possible to ensure the speakers in different working frequency bands. Give full play to make the playback characteristics of each frequency more balanced.
2. Overcome the cutting distortion caused by the vibration amplitude of the speaker diaphragm of different frequencies.
When the speaker is pronounced, its vibrating bass vibration amplitude is large and the high-pitched vibration amplitude is small. Theoretically speaking, the vibration amplitude of the speaker cone is inversely proportional to the square of the reproduction sound frequency, that is, the same speaker diaphragm, the lower the frequency, the larger the amplitude under the action of the signal voltage of the same amplitude, that is, if the frequency increases 10 times, the amplitude will be reduced by a factor of 10, or 100 times.
If we use a single speaker to produce a wide range of frequencies, it is very difficult to have a very wide amplitude of the vibration due to the mechanical properties of the diaphragm. This will inevitably cause distortion of the sound, which will reproduce the sound quality. Affected.
The study found that the cutting distortion has the greatest influence on the bass. When the woofer delivers the bass, as long as there is a high-pitched component, it will inevitably lead to cutting distortion, causing the bass to tremble and tremble. Of course, the distortion of the tweeter will also make the treble hoarse, but it will not affect the bass.
3. Reduce the sound produced between different speakers in the same speaker
Interference phenomenon For high-pitched and woofer speakers in high- and low-pitched speakers, although they operate in different frequency bands, if the full-range signal is sent to the tweeter and woofer without dividing the frequency, it will definitely appear high. When the woofer emits the same sound at the same time, when the same sound of different speakers meets, it is very likely that the sound waves interfere with each other. People who have a little common sense of sound know that once the sound interference occurs, the comb filtering effect appears. A series of problems, such as waves, which affect the good reproduction of sound to varying degrees.
After setting the frequency dividing circuit, the treble and woofer respectively obtain their own best working frequency sound signals, and the frequency range of sounds between them is hardly covered, except for a small amount of interference in the speaker crossover point and the crossover cross area. The interference of frequency sounds no longer exists.
The reason why the frequency interference phenomenon exists in the crossover point and the crossover crossover area is very simple, because the frequency division attenuation rate of the frequency divider cannot be made infinite, in the crossover intersection area, especially at the crossover point, the tweeter and the bass. The speaker will have the sound of the other band at the same time, and the sound interference phenomenon is inevitable. Therefore, the higher the frequency division attenuation rate of the frequency divider, the smaller the frequency division intersection area, and the smaller the sound interference of the speaker.
Speaker crossover features
There are two main types of frequency dividers: one is the passive crossover (PassiVe Crossover), also known as the power divider; the other is the active crossover (Active Crossover), also known as the electronic crossover.
1, passive crossover
The passive crossover is a built-in frequency divider for the speaker. It consists of a capacitor and an inductive filtering network. The frequency divider is set between the power amplifier and the speaker. This crossover divides the full-range audio power signal directly from the power amplifier into bass and treble or bass, midrange and treble, and distributes the divided signals to the speakers of each band in different frequency bands. In the full-frequency high, low or high, medium and low-frequency active crossover speakers, the frequency division task is completed by the passive frequency dividing circuit.
The advantages of passive crossover are: firstly, the structure is simple, the cost is low, and it is installed with the sound, and it needs to be adjusted and easy to use. Secondly, it is easier to connect the system. Just input the full-frequency signal to the power amplifier and connect the amplifier to the speaker. Together, you can achieve full-range playback. Third, you need less power amplifiers. Generally, one amplifier can carry two full-frequency passive crossover speakers, so the system cost is lower.
The disadvantage is that the crossover network has to bear a lot of power and current applied to the speaker, so a larger volume of inductance is used, and since the inductance parameter is directly related to the speaker impedance, the impedance of the speaker is a function of frequency. Deviation from the nominal value is large, so the error is large, and the calculation is difficult. Secondly, after the power audio signal output by the power amplifier passes through the capacitor and the inductive filter, the distortion of the capacitance and the inductance is inevitable, and the sound is distorted. Thirdly, the audio power signal output from the power amplifier will cause loss of power signal after each capacitor and inductor device, so the power signal loss of passive frequency division is large; finally, the frequency division attenuation rate cannot be made too high. Generally, the maximum 12dB/octave is too large, and the interference in the crossover crossover area is too large. This is because the way to improve the frequency division attenuation rate of the passive frequency divider is to increase the capacitor or inductor, that is, the filter order, but increase the capacitor or inductor. The number of devices means that the signal distortion and power loss increase, and the result of increasing the frequency division attenuation rate is brought about. His more problems.
As the name suggests, passive crossover is a kind of “frustration”: the frequency division method, the full-frequency power signal output by the power amplifier has to be divided, and the frequency division will lead to a series of problems, so it can only be forced to divide the power signal. . In order to reduce system cost, civil speakers all adopt passive frequency division. Professional speakers are very different from those of civilian speakers in terms of requirements, listening subjects and users. Therefore, in addition to passive crossover speakers, there are also active crossover speakers.
2. Active frequency divider
The active frequency divider is a device that divides the full-frequency audio weak signal, and is generally composed of an active electronic circuit frequency division system. The frequency division system is located in front of the power amplifier, and the full-frequency audio is weakly divided. The bass, treble or bass, midrange, and treble signals are sent to their respective power amplifiers, and then output by the power amplifier to the bass, treble or bass, midrange, and tweeter. This method is called active crossover. In the case of weak signals, a low-power electronic active filter can be used to achieve frequency division.
Each speaker unit of the passive crossover speaker has its own power signal interface. Some high- and low-bass discrete speakers can have active crossover and passive crossover. These speakers are equipped with active crossover. (Active) and passive crossover (Passive) switch, the switch on some speakers is also equipped with a locking mechanism to avoid accidental misalignment. When using the active crossover mode, be sure to turn the crossover mode switch to the "Active" side, and connect the treble amplifier to the Hi2h input and the bass amplifier to the Low input.
The advantages of active frequency division are many. First, due to the use of weak signal electronic line signals for frequency division processing, the sound signal loss is small, the distortion is small, and the reproduction sound quality is good. Second, the frequency division attenuation rate can be made higher than the passive frequency division. It is easy to reach 24dB/octave, the crossover crossover area is much smaller than the passive crossover, and the interference between the high and low volume sounds in the crossover crossover area is basically overcome; the third is good adjustability, electricity The sound index is high.
None of the shortcomings of active crossover is related to sound quality. The main problems are: First, high cost and large investment. Since the active crossover mode is high and the bass is separately used with separate power amplifiers, there are many power amplifiers, such as one-to-two distributed speakers to be driven by two amplifiers; the second is to add an electronic crossover, which makes Connection and adjustment aspects increase the difficulty of use.
I am Dongguan Juke Industrial Development Co., Ltd., our company is a transformer automation production equipment supplier.
The following are the company introduction of our company and some transformer automatic production equipment supplied by our company. If you need to purchase or customize the transformer automatic production equipment, please contact our company and contact us for purchase or customization. Thank you.
Dongguan Juke Industrial Development Co., Ltd. is a professional automation workshop production line solution provider for high frequency transformer peripheral equipment.
Juke Industry is dominated by Taiwanese technology, and all raw materials are selected and processed in strict accordance with Taiwan Standard Huai, and with the excellent technology and professional services to create maximum value for customers, and determined to become the world's high-frequency transformer automation equipment program The leading brand.
Juke Industry adheres to European standards, and its product series include: transformer inserting machine, ei type transformer inserting machine, transformer EI inserting machine, transformer core inserting machine, transformer automatic casing machine, automatic through insulation casing machine，transformer core assembly machine, transformer Magnetic core assembly rubberizing machine, (automatic magnetic core assembly + wrapping tape + test + wobble plate), Transformer Winding Machine，transformer automatic winding machine, transformer coil automatic winding machine, Transformer Core Automatic Winding Machine，CNC automatic winding machine, CNC coil winding machine, single axis CNC Winding Machine, Coil Spindle Winding Machine，Single Shaft Winding Machine, Single Shaft Winding Machine, Double Shaft Winding Machine, Multi-axis Winding Machine, 6/8/16/12 Axis Automatic Winding Machine, 6/8/16/ 12-axis automatic transformer winding machine, Single Spindle Winding Machine，automatic winding + tape machine, (USB charger automatic film wrapping machine), automatic taping machine，Transformer Automatic Taping Machine，automatic coil taping machine，transformer core taping machine，automatic rubberizing machine, semi-automatic tape machine, transformer double pressing automatic rubberizing machine, transformer magnetic ring Inductor double press automatic laminating machine, vacuum pressure impregnation process for transformers，vacuum impregnation machine, (with single and double cylinder difference: automatic single cylinder vacuum impregnation machine, double cylinder automatic vacuum impregnation machine), Vacuum pressure impregnation electric motor equipment，vacuum pressure impregnation (vpi)，transformer automatic flip soldering machine, transformer flip soldering machine, Double-head soldering machine, automatic soldering machine and semi-automatic welding Tin machine (also called flip soldering machine),Transformer Angular Soldering Machine， magnetic ring inductor pulling and forming machine, magnetic ring inductor automatic foot machine, automatic locking screw machine, double Y-axis coordinate automatic locking screw machine, automatic dispensing machine, desktop automatic Dispenser, full vision COB dispensing machine, transformer filling vacuum defoaming machine, transformer copper foil adhesive machine, computer cutting wire stripping machine, transformer comprehensive tester, automatic constant temperature oven, infrared tunnel furnace, ultraviolet curing oven, Baking line，Transformer assembly production line，core automation production line and other high-frequency transformer peripheral automation equipment, products are widely used in high and low frequency transformers, ballasts and motor manufacturers. In order to meet the needs of the market, in 2008, an branch of Yixiu District, Anqing City, Anhui Province, formed a group of professional and technical personnel to provide quality services to customers.
The following is the contact information of our company. If you need to purchase or customize the products listed above, you need to buy or customize the transformer automatic production equipment. You can contact our company and contact our business staff for purchase or customization. Thank you.
Company Name: Dongguan Juke Industrial Development Co., Ltd.
Contact: Phone / WeChat: 18819603799
Manufacturer Tel: 0796-89870552
Company website: http://tc.huiyuecn.com
Address: Room 406, 4th Floor, Jupiter Industrial Park, Jufeng, No. 53 Shangnan Road, Shangjiao Community, Chang'an Town, Dongguan City
HUIYUECNautomation main product series: transformer magnetic core automaticwinding machine, automatic tape machine, automatic vacuum impregnationmachine, automatic flip soldering machine, and so on,Products are widely used in high and low frequency transformers, inductors, ballasts and motor manufacturers.Transformer manufacturers prefer a one-stop solution.