The mixer is also called mixing console, it will be multi input signal amplification, mixing, distribution, sound modification and sound effect processing, is an important equipment for broadcasting and recording program of modern radio, stage sound amplification and audio production system. Mixer is equivalent to a sound system of the heart, the blood circulation of the heart, a direct impact on the stability of the whole system. In order to achieve the most stable sound system, in addition to understand some of the important functions of the console, the operation skills are also very important.
1, mixer signal input: in previous articles have been introduced, the mixer input signal is generally divided into low resistance microphone signal input and high resistance line signal input two. Specifically. Now we use the cable dynamic microphone and microphone signal is low, but because of the wireless microphone microphone receiver amplifier have high resistance signal; and various audio playback devices such as DVD, CD, VCD, LDMD, MP3, tape recorders are high impedance signal; and a variety of instruments such as electronic organ, electric bass and other standards are high impedance signal, but in some special cases can also use low resistance input port.
2, mixer channel gain adjustment: to enter the mixer in the sound source, we first have to distinguish it is low resistance or high resistance, and then use the standard signal line is connected to the mixer. If you want to make each sound source to achieve the perfect sound quality, we need to carefully adjust the. The mixer gain for each input channel is a very important and very critical, if only to gain a lot of sound simple as a volume knob is wrong, in fact, the gain is more important to control the dynamic range of input signal, the effective dynamic range is the biggest gain to the maximum distortion. That is the best in the state. Here I used to describe the characteristics of water: the mixer input channel and the input line will have a basic background noise, the background noise is like the sediment in the river, is not eliminated. You know, when the water is not deep, flowing water is mixed, water sure this is not good. That is to say if the gain is too small, open dynamic range, audio signal is like water Nishajuxia, background noise will come out, then the sound is certainly not good; on the contrary when the water is deep, the flow of water is relatively clean, water quality must be very good, that is to say open the appropriate size and gain a large dynamic range, so sound quality must be very good; of course, if the gain is too open, as if the waters prevailed, even the dam have washed away, the river were ripped off, this is equivalent to the signal to distortion, this time of course, what is not sound. Will cause damage to the equipment, so it is not gain better, to have a degree, the fit is good. I would like to describe the role of the gain, even the sound beginners should be able to understand it.
How to adjust the gain here is simple brief introduction: A, microphone gain adjustment: whether dynamic microphone, microphone or wireless microphone, in the mixer access, we can use the corresponding mixer channel monitoring signal or PEAK overload indicator to adjust the gain, the specific method is to first press the need to adjust the microphone channel monitor button, a hand holding a microphone to speak loudly, on the other hand slowly increase the microphone where the channel gain, while observing the console monitor signal lights, signal lights to be 0-4dB, the gain of the microphone is basically a good tune. If the mixer no monitoring signal lights, it can observe the channel PEAK overload indicator, when we speak loudly when the lights occasionally lit, then gain the knob down slightly, then the channel gain is basically good tune. It should be noted that the voice of professional singers are generally larger, we should pay attention to observation, if necessary, appropriate to close small gain. While some may be wireless microphone respectively with low resistance and high resistance ports port two methods after the test to gain to the best, generally the microphone gain adjustment between the knob is 11 similar to the clock in the -14 point range. Gain adjustment for B, for DVD, CD, MD, tape recorders and other audio playback device should be flexible, these devices are basically through high resistance input to the mixer, gain adjustment method and microphone, monitor the use of signal indication channel or PEAK overload indicator to adjust. But DVD and CD sound, gain generally adjusted between 9 similar to the clock in the -11 point range; some of the MD sound signal is too small can be up to 10 -12 points; some smaller signal recorder can be opened to about 11 -14 points position. Gain adjustment method and microphone gain adjustment method, C instrument is the same, but note that some instruments with high impedance signal input signal gain feel enough, it should be replaced with a low impedance input, because the instrument itself large noise, and between the stage and the mixer is connected with the distance too far the line is longer, the line will have the noise, so it can gain from the experience of these instruments had 12 points, otherwise you will hear the obvious noise, so we can use the appropriate port to connect the low resistivity instrument. To sum up, the tuning range of the tuning knob is basically at 9 -14 point, which is beyond the range of the signal.
3: mixer channel equalization group adjustment: when the gain is adjusted, the general next to adjust the balance of the mixer channel set, the order of the adjustment should be the first part of the tune from the bass, and then adjust the treble part. Because only to ensure the sound of the basic sound, in order to ensure a good number of sound sound. The basic adjustment we should be no problem, here I just say a few tips. Now the equilibrium group of professional mixer general with a frequency adjustment, using a lot of sound not flexible, all said with very difficult, some things depend on the individual's perception, I can only say simple: for example, in disco music, feel the bass is not enough, we can put the bass frequencies where the disco music channel a balanced group selected at around 200Hz, and then a modest boost by adjusting knob, this bass efforts came out. Of course, if you feel the bass efforts too, sound too hard, not full, so we can put the music channel bass frequencies in about 200Hz, and then add the channel attenuation equalizer LOW bass volume properly, then the music will reduce the strength and increase the hardness, fullness. Another example of a female singer DENTALIZATION obviously very outstanding, we can put the frequency in about 6000Hz, and then with moderate attenuation knob, so that it will be appropriate to reduce the dental. If the use of flexible, can also use the frequency selection function balanced group to suppress acoustic feedback, such as general ballroom around 300Hz will have a resonance peak, often prone to the frequency of acoustic feedback, we can put the microphone input channel selection frequency of about 300Hz, and then with moderate attenuation knob, so can effectively reduce acoustic feedback, increase the clarity of voice. Of course, the frequency of sound feedback generated by each sound field is not the same, but no matter what the frequency of the acoustic feedback, you can use this simple control, of course, this need to be flexible to control according to experience. If you want to adjust the sound field and to avoid acoustic feedback is the need to use professional multi - stage equalizer or feedback suppressor to adjust, in the future will be described in detail. In short, in a mixer, the need for the sound of the division is often adjusted to balance the console. Often see some sound engineers only know the volume fader to push and pull, or do not understand more hands to adjust the balance knob in the show, can be said that every time we need to adjust the mixer, with a song for example: when the singer to the stage to introduce their repertoire, we need to take the microphone the bass off small, the reverberation to moderate or turn off, so as to ensure the clarity of language; when the music sounded the singer began to sing, we need to increase the microphone bass sound will appear thin, otherwise, with the right to increase the volume reverberation; in order to avoid singing music treble treble to grab the microphone, we according to the needs of the high music
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