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The connection of the mixer

Publisher: AdministratorTime:2018-2-3 16:38:12
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Mentioned sound system, of course, we will first think of mixer, mixer, there will be a lot of kinds of description method, the most appropriate way to mixer metaphor as a sound system of the heart, the heart blood circulation, directly affect the performance of the whole system. Image for mixer is just like a big water tank, we have a variety of audio signals like water enter into the big pool, and then in a pool of water flowing in a variety of reasonable processing, and then from various channels, the whole process is so simple. So the connection to the mixer is nothing more than the input and output.

(I) connection of the input part of the mixer:

The input signal of the mixer is generally divided into two types: low impedance microphone signal input and high impedance line signal input. In fact, we can think of the distinction between low resistance and high resistance as the difference between water pressure or flow velocity. Such as the high impedance input level is high, as if the water pressure is very big, the water is urgent, direct input to the mixer in the pool is right, not what's in the middle part to adjust the water pressure and water flow rate; But low impedance input level is low, as if the water pressure is low, the water slowly, direct input to the mixer in the pool is not appropriate, we'll need in a big pond and a water pump, give it more low resistance of low water pressure, flow speed! Therefore, special circuit amplifiers are built into the low resistance input channel circuit of the mixer, and the low level is amplified to the appropriate level. So the characteristics of water use to describe low impedance signals and high resistance signals should be well understood.

Only after the high resistance and low resistance can be distinguished, the correct wire can be selected for the corresponding connection. In general, the input socket of the mixer can be divided into three types:

1, TRS: high impedance input part usually takes 6.35 cm balance input TRS stereo connector, try not to use 6.35 TS tone (sound) joint to make the unbalanced input, and now we use most of the audio source equipment such as: CD, VCD, DVD, MD, MP3, etc, and most of the instruments of the output signals are usually high resistance.

2. XLR: while low resistance is usually used as a balance input with the XLR kanon joint, most of the wired microphones are usually connected to the mixer with a low resistance socket.

3. RCA: if there is a TAPE recording input, it is usually connected by RCA lotus connector.

Mixer signal input part problems need attention: the above has introduced the mixer of the input signal can be roughly divided into low resistance and high impedance input, but all the way to accurately define a particular signal belongs to low resistance or high resistance would need to be flexible. According to the standard, for example, electronic organ, electric bass, electric guitar belongs to the high impedance signal, with a 6.35 input to the mixer can plug, but there are some parts from the stage to the mixer between cable is too long, the line resistance is big, plus the lighting system, make the signal lines of background noise is very big, even if you don't enter any audio signals, this line on the tuning stage when the input channel gain up will have a lot of background noise, as described above: This line is a river, the river sediment has now too much, this time a lot of noise in the line or not to change, and the line on the other side of the instrument at maximum volume has to be increased again, also can only give you so deep is the river water, then how to do? If the input of high impedance signals is equal to the water in the river does not increase, the water quality cannot be changed, and the quality of sound is not changed. If you use a cannon plug to input a signal from a low resistance socket, a little shallow water in the river will be amplified by a low resistance amplifier, so that the water is deep, the water quality is good, and the sound quality is good. It's not very real. You can try it. I do a lot of engineering now, the band basically is to use the cannon to cut from the low resistance input, although the surface looks not standard, but actually also reduce the band noise of frustration. So we need to be flexible and find the best way to work in practice.


(2) connection of the output part of the mixer:

Now the output part of the professional mixer has a lot of intersections, and each has a division of labor, which is not like the input part, although it is relatively simple. Be careful when connecting the output signals. Generally, the main output part of the mixer is the total volume output, volume output, AUX output, etc. In general, the output part of the mixer can be divided into six parts according to the function.

1, marshalling output: if we put the bass speakers by 1-2 marshalling alone to control the volume, then only from the mixer 1-2 marshalling the corresponding output pin output audio signal, most use TRS marshalling output output stereo jack for equilibrium output and, of course, also some use card socket.

2. Main channel output: l-r main channel usually adopts XLR caron balance output, and some small tuning stations can also be replaced by TRS stereo bayonet.

3, AUX output: tuning taichung AUX output is the most commonly used output of vocal effect, the second is used to provide monitoring signal band or singer, of course, open to other USES, such as: the tape, used as auxiliary speakers signal, etc. AUX usually USES TRS stereo socket output signals.

Four part, Direct output directly: more professional mixer in each input channel and a "Direct Direct output pins, the pins can be provided to other equipment used for recording, such as monitoring, each channel mixer is usually use TRS stereo jack output signal. TV station need to live like a performance, the scene also want to live, if have 20 audio signals, then we can put this 20 road audio signal input to the first television mixer, then reuse television mixer in the Direct output socket directly audio signal input to the 20 road mixer in live performance. Now, of course, for the sake of safety is the first 20 audio signals by signal amplification distributor, distribution, good after adjustment, it gave television mixer, live performances, mixer, standby emergency mixer, recording mixer or other equipment, etc.

5. Recording output: the general analog recording output signal socket mostly adopts RCA lotus connector. If it is a digital signal, it may be used in other digital output such as optical fiber and firewire.

6. INS insertion: this socket in the mixer is between the input and output, and it is connected by TRS stereo connector. About INS insert plug out a lot of acoustics division may not be used, it can be a peripheral device is inserted into the mixer one input channel, marshalling channels or main (left and right channels), by inserting channel of the single voice signal processing. When used with three core stereo TRS connector to connect, three core methods from TRS stereo output signal plug head end, got to insert the input devices, and equipment from the output end of the sent signal received three core TRS stereo plug ring end, and then into the mixer. For example, we can use this method to the microphone mixer 1, 2 road insert an equalizer, is equal to 1, 2 microphone the conduit truncation, added a water processor (equalizer), and then input to the mixer, so adjust the sound effect is better.

Above for mixer connection, whether mixer part of input or output, the socket and the signal connection mode is basically used these, just pay attention to the correct connection.

2. Connection of equalizer and pressure limiter:

1, automatic: it is well known equalizer's main function is to adjust voice quality, adjust the sound field and acoustic feedback, so the equalizer in the sound system now is almost indispensable equipment, the current balance of input and output part is the balancing socket, connection is the best balance circuit, XLR connectors can be used, of course, also can use TRS connector balance line.

2. Pressure limiter: the pressure limiter is a device for processing audio signals, which can compress or restrict the dynamic performance of the audio signal. In fact, the main function that we use now when we use the voltage limiter is to make it compress the high level signal so that it can protect the sound equipment of its lower level. Can say in a complete set of audio equipment, in addition to the mixer and the equalizer, pressure limiting device is the most important peripheral devices, so normal press limits should be placed in front of the power amplifier, the back of the other peripheral devices. The connection can be made by using the balance line of the XLR connector or the balance line of the TRS connector.

Iii. Connection of electronic divider:

Electronic frequency divider is to point to to 20 hz - 20000 hz frequency range of audio signal is divided into suitable, several different frequency, and then sent to the corresponding respectively amplifiers, used to drive the corresponding speaker of a peripheral audio equipment. At present, the input part of the electronic frequency divider is relatively simple, but the output part is more complicated: there are high-pitched output, alto output, bass output, etc. In connection the bass signal output and the high frequency signal output must not be confused, or high signal to the bass speaker, bass signal to the high-pitched sound box, thus could no sound came out in the sound system, because the frequency is wrong, maybe will burn out speakers equipment! The electronic divider can use the balance circuit of the XLR connector or the balance line of TRS connector at the connection surface.

Iv. Connection of feedback suppressor

In terms of equipment connection, the balance line of XLR joint or TRS connector is also used. The connection method can be divided into the following three types:

1. In the system of sound system, such as the equalizer and other peripheral devices, the advantage of this connection is that the connection and operation are very simple and suitable for the simpler system. However, the disadvantage is that the connection method can also affect the other source signals through the feedback suppressor when suppressing the microphone feedback.

2, the use of the INS in the mixer channel insert/plug out of the interface, the feedback suppressor concatenated separately in the corresponding channel, the advantage of this connection is: can utmost to adjust feedback suppressor, regardless of will affect other audio source. The disadvantage is: with this connection method, a feedback suppressor can only control 2 channels of the mixer, and the equipment utilization is too low.

3, using the INS in the mixer marshalling insert/plug out of the interface, the feedback suppressor concatenated in corresponding marshalling channel, its advantage is: to make up into the organization of the microphone for centralized processing, and will not affect the other sound source. In general, this method can be used to make full use of the feedback suppressor, so it is also the most used connection method at present.

5. Connection of time delay device:

The delay device can delay the audio signal, which is usually used in a system with large acoustic field and multi-group sound amplification. Because in such a system sound made by different location of the speaker, when reach the ears of the listeners have successively into, so as far as possible in order to ensure the consistency of audio-visual, increase the readability of sound, from sound sense of turbidity, edge and drag the end, it is necessary to use relevant processing delay timer. In terms of determining the delay object, which is the delay? In fact, it's easy to understand the following three points:

1. The first is people-oriented, and more and better audio equipment is also for human service. Therefore, in a sound field, we should first base the audience on the audience.

2. The second is based on the main sound source, which is usually the location of the main speaker and the main stage. Ideally, it should be the sound of the main source that goes directly to the ears of the audience. But as a result of sound energy, range, directivity, the homogeneous degree of the sound field sound pressure, so most of the increase in indoor sound reinforcement system now some distance from the audience's auxiliary voice box.

3. The third point mainly refers to the auxiliary sound box which is close to the audience, which is the speaker that may need to be delayed.

In most cases, the first factor was determined, the second factor was determined, and then the auxiliary sound box of the third factor was delayed. The speed of sound is about 340 meters per second, so the delay time is calculated based on the distance between the auxiliary speaker of the third factor and the primary speaker. Know the delay timer delay object can be the right connections, connection is basically like equalizer and other peripheral equipment concatenated in sound system need time delay signal channels, using XLR connectors balance line or the balance of TRS connector line to connect.

Vi. Connection of exciter:

Audio exciter is actually a kind of harmonic generator, which USES human's psychoacoustic characteristics to modify and beautify sound signal processing equipment. The exciter generally has the following three types of connection usage:

1, can be like equalizer and other peripheral equipment concatenated in the sound system needs stimulation signal channels, such as in a mixer, 1-2 marshalling is vocal, if you want to inspire the marshalling vocals, and can plug the actuator using the insert/interface to connect to the 1-2 marshalling channel mixer.

2. If comprehensive processing is to be performed, it is ok to string an exciter in the output channel of the main volume output channel or other grouping of the mixer.

3, the driver can also like effect instrument from AUX sends out signals, and then returns to the mixer, such which some channels need to be incentives can adjust processing, such as how to deal with the strength of the is, so that is more flexible.

The exciter is also connected with the balance circuit of the XLR joint or the TRS connector.

Vii. Connection of digital effector:

Effect is processing, manufacturing all kinds of sound field effect of peripheral audio equipment, commonly used in to deal with vocals, in most of the sound system, if the vocals without effect instrument processing will become no fullness and brightness, namely: dry no moisture. Now the latest effectors use digital processing chips, so we call them digital effectors. Effect is less like equalizer and other peripheral equipment concatenated in sound system, generally from the mixer of AUX sends a signal to the effect of input interface, and then from the effects of the device return signal output interface to the mixer. In terms of signal connection, most of them are connected by the balance circuit of TRS connector, and some of the professional effectors are also connected by the balanced line of XLR connector.

Viii. Connection of amplifier and speaker:

This should be familiar to all of you, just to be careful: the signal line should be used as far as possible to use the balance line, so as to minimize the noise. Many sound engineer like to put all the way or two way signal lines to supply more borne power amplifier, but if more than four amplifiers, or suggest using signal amplifier to separate quantity is enough, no attenuation of signal supply each power amplifier used alone, which reduces system noise, reduce risk, improve signal-to-noise ratio. In terms of power transmission, try to shorten the distance of the speaker line by using a thick, short speaker line and a reasonable cabling, and then pay attention to the positive and negative terminals to avoid short circuit.

Problems to be noted for connection of equipment:

1. Pay attention to the power supply: the audio equipment should be equipped with a special power supply, which should be separated from the power supply of the light, and the light will prefer a lower voltage, but the sound should be standard voltage. With special power supply, there is also a stable and reliable power outlet, which can be used to use "power timing device". Although the cost increases, the stability and ease of use are improved. In short: it is vital to properly and securely connect the power supply of all sound equipment. Also note: some imported equipment.

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