When it comes to audio systems, of course we will first think of mixers, mixers, there will be a lot of descriptions, the most appropriate is to compare the console to the heart of a sound system, how this heart blood circulation, Directly affect the performance of the entire system. In terms of image, the mixer is like a large water treatment tank. We input a variety of sound source signals into the large pool like water, and then properly handle the inflowing water in the pool, and finally from various Flowing through different channels, the whole process is as simple as that. Therefore, the connection to the mixer is nothing more than: input and output are two parts.
First, the input and output part of the connection:
(1) The line connection of the input part of the mixer:
The input signal of the mixer is roughly divided into two types: low-resistance microphone signal input and high-resistance line signal input. In fact, we can regard the distinction between low resistance and high resistance as the difference between water pressure and water flow speed. For example, the high-impedance input level is high, as if the water pressure is very high, the water flow is more urgent, and it is suitable to input directly into the pool of the mixer. It is not necessary to add any link in the middle to adjust the water pressure and water flow rate; The low-impedance input level is low, as if the water pressure is very low, the water flow is very slow, and it is not suitable to directly input it into the pool of the mixer. We need to add a pump in the large pool to low-resistance low water. Press it to increase it and let the water flow speed up! Therefore, a special circuit amplifier is built into the mixer's low-resistance input channel line to amplify the low level to an appropriate level. The characteristics of water use to describe low-resistance signals and high-resistance signals should be well understood.
Only after clearing the high resistance and low resistance can the correct wire be selected for the corresponding connection. In general, the input jacks of the mixer can be basically divided into three types:
1, TRS: high-impedance input part usually use 6.35cm TRS stereo connector for balanced input, try not to use 6.35 TS mono (sound) connector for unbalanced input, and now most of the audio playback devices we use such as: CD, The output signals of VCD, DVD, MD, MP3, etc. and most instruments are usually high impedance signals.
2, XLR: And low resistance is usually balanced input with XLR card connector, and now most wired microphones are usually connected to the mixer with a low-resistance jack.
3. RCA: If some mixers have TAPE recording input, it is usually connected with RCA lotus* connector.
The problem that the mixer's signal input part needs to pay attention to is that the input signal of the mixer has been generally divided into low-resistance and high-resistance inputs, but how to accurately define whether a certain signal is low-resistance or high-resistance requires flexibility. For example, according to the standard, the keyboard, electric bass, electric guitar, etc. are high-resistance signals. It is only necessary to input the 6.35 connector to the mixer. However, in some places, the connection line from the stage to the mixer is too long. Large, coupled with system interference such as lighting, the noise floor of this signal line is already very large. Even if no source signal is input, the gain of the input channel of this line will be increased when the mixer is turned on. The big noise floor is as described above: this line is a river, and now there is too much sediment in this river. At this time, the noise in this line is still unchangeable, and the line is over there. The volume of the instrument has been turned to the maximum and can no longer be increased, that is, the river can only give you so much water, so what should I do? If the input with high resistance signal is equal to the increase of water in the river, the water quality can not be changed, and the sound quality can of course not be changed. If the signal is input from the low resistance jack with a plug, the shallow water in the river will pass through the low resistance amplifier. The magnification is so deep, the water quality is good, and the sound quality is good. It doesn't seem to be true, everyone can try it. I have done a lot of work now, the band basically uses a card socket to input from low resistance, although the surface looks irregular, but it is actually a helpless way to reduce the band noise. So we still have to be flexible and look for the best way to work in practice.
(2) The line connection of the output part of the mixer:
Now the output section of the professional mixer has a lot of sockets, and each has a division of labor, unlike the input section, although the socket is many, it is relatively simple. Therefore, be careful when connecting the output signals. Usually, the main output part of the mixer refers to the total volume output, the grouping volume output, the AUX output, etc. In general, the output part of the mixer can be divided into six parts according to the function:
1. Group output: If we separately control the volume through the 1-2 group, then we can only output the audio signal from the corresponding output jack of the mixer 1-2 group. Most of the output ports of the group output adopt TRS. Stereo jacks are used for balanced output, and of course some are used for cassette jacks.
2, the main channel output: LR main channel usually uses XLR card balance output, some small mixers are also replaced with TRS stereo jack.
3, AUX output: AUX output in the mixer is most commonly used to output to the vocal effects, followed by the * signal for the band or singer, of course, for other purposes, such as: recording, used as an auxiliary speaker Signals, etc. AUX typically uses a TRS stereo jack to output signals.
4, Direct direct output part: more professional mixers each input channel also has a "Direct direct output" jack, this jack can be provided to other devices for recording, *, etc., usually every channel of the mixer The signal is output using the TRS stereo jack. For example, a performance TV station needs to be broadcast live, and the scene should be broadcast live. If there are 20 channels of audio signals, then we can input these 20 channels of audio signals into the mixer of the TV station first, and then use the Direct direct output in the TV station. The jack re-enters the 20-channel source signal into the mixing console of the live performance. Of course, for safety now, the 20 channels of the source signal are first adjusted and distributed through the signal amplification distributor, and then sent to the TV station mixer, live performance mixer, standby emergency mixer, recording mixer or other. Equipment, etc.
5, recording output: the general analog recording output signal socket mostly use RCA lotus * connector. If it is a digital signal, it may use other digital output methods such as fiber optic and firewire.
6. INS plug-in jack: This jack in the mixer is between the input and output. It is connected by a TRS stereo connector. A lot of sound engineers may not use it for inserting and inserting INS. It can insert a peripheral device into an input channel, group channel or main (left and right channel) channel of the mixer, and separately sound signals to the inserted channel. Process it. Use TRS big three-pin stereo connector for connection by outputting the signal from the TRS big three-pin stereo plug head to the input of the device to be inserted, and then sending the signal from the output of the device to the TRS big three core The loop end of the stereo plug then flows into the mixer. For example, we can use this method to insert an equalizer into the microphones of the mixer 1 and 2, which is equivalent to cutting off the water pipes of the 1 and 2 microphones, adding a water processor (equalizer), and then inputting to The mixer makes it better to adjust the sound.
The above is the connection of the mixer. Regardless of whether it is the input part or the output part of the mixer, the sockets and signal connections used are basically these types, but the connection should be correct.
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