Mixer, the multi-channel input signal amplification, mixing, distribution, sound quality modification and sound processing. It is a sound system of the heart, the heart of the blood circulation how, directly affect the stability of the entire system.

1 signal input

The mixer's input signal is roughly divided into low-impedance microphone signal input and high-impedance line signal input. Each input can be regarded as a water pipe, that is, if a mixer has multiple signal input is like a water pipe to the mixer for the same treatment. The distinction between low resistance and high resistance can be seen as a difference in water pressure or velocity. For example: high-impedance input level is high, as if the water pressure is large, the water is more urgent, directly into the mixer to the pool on the right, do not have any links in the middle to adjust the water pressure and water flow; but Low resistance input level is low, as if the water pressure is very low, the water is very slow, directly into the mixer this pool is not appropriate, need to add a large pool in the pump, the low resistance of the low pressure to It is increased, so that the water speed to speed up, so the mixer's low resistance input channels are built-in dedicated circuit amplifier, the low level to the appropriate level. So that the characteristics of water to describe the low resistance signal and high impedance signal we should be a good understanding.

2 channel gain adjustment

To enter the sound source in the mixer, first of all to distinguish it is low resistance or high impedance, and then use the standard signal line connected to the correct mixer. If you want to make every source of sound to achieve the perfect sound quality, you need to carefully adjusted. Mixer The gain of each input channel is very important and very important, but a lot of sound division seems to just put the gain simply as a volume knob only, so it is wrong. In fact, the gain is mainly used to control the input signal dynamic range, the general gain to the maximum distortion is not the maximum effective dynamic range, and the best effect of the state. This is more difficult to understand, or water to describe it: the mixer's input channel and input line will have a basic background noise, the background noise is like the river bottom of the sediment, can not be eliminated. We all know that when the river is not deep, the flow of water is the bottom of the sand, so the water quality is certainly not good. So that if the gain adjustment of the dynamic range is insufficient, the sound source signal is like a muddy under the water, the background noise will suddenly come out, then the sound quality is certainly bad; the contrary when the river is relatively deep, The flow of water is relatively clear, the water quality is certainly very good, that is, adjust the dynamic range of the larger, more reasonable, so the sound quality is certainly very good; of course, if the water is vast, even the dam are washed away, the river gave Overturned, and this is equivalent to the level signal to the distortion, and this time not to mention what sound quality, but also damage to the equipment, so the gain is not the bigger the better, to have a degree, I would like to describe the role of this gain, even if the audio beginners should be able to understand it

3 channel equalization group adjustment

When the gain is adjusted, the general next step is to adjust the mixer channel of the equilibrium group, and adjust the order should be started from the bass part of the tune, and then tune the treble part. Because only to ensure the sound of the basic sound, in order to ensure a good sound many times overtones. The basic adjustment we no problem, where the author only said a few tips on things.

Now the professional mixer of the equilibrium group are generally selected with a frequency adjustment, a lot of audio division will not be flexible use, to all that detailed is difficult, some things rely on personal understanding, I can only simply talk about＆#58 Said that in the release of high music, the feeling of bass is not enough, you can put the high frequency of music in the channel balance group of bass frequency selected at 200Hz or so, and then adjust the knob with a modest increase, so that the bass strength came out; A female singer's teeth are obviously very prominent, you can select the high frequency frequency of about 6000Hz, and then use the adjustment knob for moderate attenuation, so that will be appropriate to reduce the teeth of the. If the use of flexible, you can also use the balanced group of frequency selection function to suppress acoustic feedback, such as the general dance hall around 300Hz will have a formant, often the frequency is easy to produce acoustic feedback, you can enter the microphone input channel frequency of about 300Hz , And then use the adjustment knob for moderate attenuation, so that you can effectively reduce the sound feedback. Of course, each sound field produces the frequency of acoustic feedback is not the same, but no matter what the frequency of sound feedback, you can use this method under simple control, of course, this need to be based on experience to flexible control, but also to adjust the sound field and avoid Acoustic feedback is required to be adjusted with a professional multi-stage equalizer or feedback suppressor.

In short, a mixer, the need for sound division often hands-on adjustment is the mixer's balance group. Often see some sound division only know that push and pull the volume fader, too lazy or do not know how to adjust the balance knob, in fact, in use, it can be said that all the time need to adjust the mixer.