Filed a mixer, there will be a lot of kinds of description method, the most appropriate way to put the mixer as a sound system of the heart, this heart how the circulation of blood, directly affect the stability of the whole system.

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.

1, the mixer signal input

Mixer of the input signals can be broadly divided into low resistance microphone input and high impedance circuit signal input two kinds. Each input can regard it as a conduit all the way, that is if a mixer with multi-channel signal input is like the water flow into the mixer for processing of multiple conduit. We can put the low resistance and high resistance to distinguish as different water pressure or flow rate. 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, so the low impedance mixer in the input channel are built into the amplifier, the low level to the appropriate level. This water to describe the characteristics of high resistance and low resistance signals everyone should be well understood.

2, mixer channel gain adjustment

To input to the audio source in the mixer, the first thing we want to distinguish it is a low resistance or high resistance, then using standard signal lines connected to the tuning stage of right. If you want to let each audio source all the way to achieve perfect sound quality, we need to carefully adjusted. Mixer each input channel is critical gain is important, but it seems that a lot of sound engineer just to gain is simple as a volume knob, this is a mistake. Actually gain is mainly used to control the input signal dynamic range, the maximum gain transferred to no distortion is the largest effective dynamic range, when is the best effect.

3, the adjustment of the mixer channel equalization group

After the gain set, generally will adjust the balance of the mixer channel group the next, adjust the sequence should be from bass part first, then adjust the high part of the. Because only the basis of guarantee the sound, to guarantee the multiple harmonic sound good. Basic adjust all no problem, here I only say some skills. Now professional mixer balanced group with frequency selective adjustment, a lot of sound engineer not flexible use, it is difficult to said all detail, there are some things depends on personal understanding, and I can only simple tell me: for example in a disco music, feel the bass is not strong enough, we can put the disco music channel equalization group's bass frequencies around 200 hz, then use doing moderate adjustment knob to ascend, such efforts in the bass came out; Again like a female dental stand out clearly, we can choose high frequency at around 6000 hz, then moderate attenuation by adjusting knob, that would be appropriate to reduce dental. If the use of flexible, can also use a balanced set of frequency selective function to suppress acoustic feedback, such as general ballroom in 300 hz or so there's a resonance peak, often easy to produce the frequency acoustic feedback, we can to choose the microphone input channel frequency at around 300 hz, and moderate attenuation by adjusting knob, so that it can effectively reduce acoustic feedback. , of course, each producing acoustic feedback frequency is not the same, but whatever the frequency of the acoustic feedback, can be under control by this method is simple, of course, this requires flexible control according to the experience. And to perfect adjustment and avoid acoustic feedback equalizer is needed to use more sections or to adjust the feedback suppressor, in the later surrounding system will be introduced in the article. All in all a mixer, need a sound engineer often begin regulating mixer is balanced group. Often see some sound engineer only know push-pull volume pusher, lazy, or don't know how to go to adjust balance knob, actually in use, can be said to be every moment we all need to adjust mixer, with a song, for example: when the singer to introduce their own stage pieces, we need to turn down the receiver of the bass, turn off the reverberation transferred to moderate or, so we can ensure the definition of the language; When the music sounded singer started to sing, we need to put the receiver bass, otherwise the voice is thin and at the same time the reverberation volume increase to the right; In addition to avoid music singing soprano rob microphone high, we can put the music treble slightly attenuation; But when songs make up, the attention of the audience will be shifted from the singer to the music, so this time we need to increase the high music, the music sound up at the same time, this will be very good, very nature of the music, or no change will be too rigid. And we're going to turn down the volume reverberation time, so that even when the singer in make up suddenly to talk also won't have very miscellaneous reverberation sound; When songs played out between a move to the next period of singing, we'll be turning down the music, attenuation music soprano, pushing big microphone and volume reverberation. At the end of the sung climax, we also need to put the microphone volume is big, then put the music volume moment from small to large, creating a perfect, shock, grand climax effect to the end, of course not all of the songs are suitable for such operation, so the sound engineer need to do is flexible. I feel really want to give expression to mixer for each function in writing, may want to write a thick book, and the effect is not obvious, here our space is limited, I'm just beginning, the way I use for years experience of mixer, concrete aspect depends on individual effort and learning.

4, the adjustment of the mixer channel AUX

General tuning stage of adjustment knob is the most balanced group, followed by AUX knobs, term is: auxiliary sends control. Because belongs to auxiliary nature, so a lot of sound engineer did not attach enough importance to it, also did not fully understand its function, remember when studying in Beijing bureau in 97, about the AUX teacher speak for two days, but many classmates is a confused, finally I really couldn't help it, spent two minutes to unlock their confusion, two days after understand a lot of classmates are lamenting the AUX turns out to be so simple! Can't say I at that time, of course, the level above the teacher, it's just that I used A image of the metaphor: I said actually mixer of each input channel is like A big water pipe, water came in and basically divided into A, B two water main: road A water main is: the volume of the mixer this channel pusher, send out through marshalling etc, filed A channel to know the volume is so everyone can; Another B road water main is: the AUX group, the difference is A mixer in the AUX part can be divided into multiple, if A mixer with 4 road AUX, it was like the AUX group this article B water main is divided into 4 road small water pipe flow out again, the principle of it and the pusher, just most of the volume of the AUX switch knob is used to control, and it is A channel of the volume switch with pusher control, like A big pipe even under the water main is divided into A, B two road, and divides A lot of small pipes under them, but out of the water quality is still the same. So we can't only look at things on the surface of differences, they actually function is pretty much the same. See here most of the stereo beginners may be understandable, the most main is actually understand AUX knob and function of the volume of the mixer is so as you can. Will say next AUX group under the specific method of use: AUX is most commonly used for external of vocal effects, we need the voice of the processed with the corresponding AUX switch sent to the effect, after processing to flow back to the radio. This is the basic knowledge, should be the most of the sound engineer, Large mixer AUX would have a pusher before/after conversion, when set in front of the pusher, the passage below the total volume of the volume of the pusher can't control the road AUX. On the contrary it is controlled by the channel of the total volume. AUX other function is for monitoring or recording. Another convenient use is that we can also use the AUX control a bass sound system volume, so need more bass channel can up corresponding AUX, without the need for a big bass volume of the sound source, such as microphone, and their corresponding AUX can open less volume, otherwise easy to generate bass sound feedback.

5, mixer audio-visual balance adjustment

Mixer of audio-visual generally sound engineer all understand, but many are rigid, such as a two channel stereo music signal input to the mixer, most of the sound engineer will bring the two channels of audio-visual knob to the left and the right to the end, that is "stereo", in fact, so the two channels will appear to be floating out voice, weak, weak middle; Played in the middle if the audio-visual knob will feel top end up music voice, very uncomfortable, and the width of the sound is not enough; The best location is on the left channel of audio and video button to clock at 9 o 'clock position to the right channel of audio-visual knob to clock 15 point location, this music can neither blanketed, wide dynamic range, and penetration and better. You can try carefully, principle I wouldn't have analyzed, I only pay attention to practice. Audio and other aspects of the application I also not much said, is the basic knowledge. Actually is often think is the most simple things, to think of it, it is very complicated.

Part 6: mixer the main output adjustment: mixer's main output part refers to the marshalling the volume and total volume. For example, we can put the band made up to 1-2 marshalling; Put the receiver in the 3-4 marshalling; Turn the bass by 5-6 marshalling to control, the secondary speakers by 7-8 marshalling the volume control and so on, in general there are multiple marshalling mixer is better and convenient control. Other marshalling marshalling signals can choose a single output signal or cuts mixer to the master level hybrid control. Other such as channel pusher is very simple, but according to each input channel of pusher, flexible control volume adjustment is simple but very important part of this section, mainly observe various signal input and output signals, there can be a serious distortion.