Weak current College】 【professional mixer using the techniques and issues --- Power By】 【China power house network.

Lift the sound mixer, there will be many describe method, the most relevant is the mixer as a sound system of the heart, the heart and blood circulation, have a direct impact on the stability of the entire system. Blood is the fluid, water is the liquid, the two substances are equally important, the ancient Chinese saying: Avenue of the fleeting ... Mean is the development of everything is orderly, like water of the Nile, endless, never dry ... Here also refers to water that trait to describe the sound mixer mixer is like a large pool of water treatment, and a variety of audio sources as input signals like flowing water into the large pool, and then in the pool for flowed into the water to carry a reasonable deal, then from various different channels stream out, the whole process is so simple.
See here many expert will fall, estimated eyes lenses have to loose, you blame the author in nonsense, get some crooked ways non-academic stuff! but new ideas start always widely questioned how effective it is to rely on the broad audio workers identification! the following author is divided into several parts on a system with a mixer, I told some people more concerned about focus, other basic knowledge you should be very ripe, and no longer.

Mixer functions and operations skills important

1. the signal input: sound mixer mixer of the input signal is generally divided into low impedance microphone signal input and high-impedance line signal input. Enter each one can see it as a water pipe, that is, if a mixer with multi-channel signal input as if there is a lot of water pipes in the water flow to the mixer for processing. The author can put low resistance and high distinction as a water pressure or flow rate. For example: the high-impedance input level, much like the water pressure is very large, the water flow is urgent, entered directly into the mixer this sink is right, do not add any link in the middle to adjust water pressure and water flow; but low resistance input level to low, just like the water pressure is very low, the water flows slowly entered directly into the mixer this sink is not appropriate, authors are required in the large pool of Riga on a pump, low resistance and low water pressure to increase, let the water run faster, so a mixer of low resistance input channels have built-in special circuit amplifier, the low level of zoom to the appropriate level. In this way the characteristics of the water used to describe low resistance and high impedance signals you should be very easy to understand.

2 a mixer channel gain adjustment: to enter into the mixer, audio sources, I have to first decide what it is low resistance or high impedance, and then use the standard signal cable is properly connected to the mixer. If you want to make a per audio sources are perfect sound quality, the author would need careful adjustment. Each input channel mixing console's gain is very important is critical, but a lot of sound Division seems to gain simple as a is a volume knob, so are all wet. In fact, gain mainly used to control the dynamic range of the input signal, usually gain to the distortion is the most effective dynamic range, it is the best effect state. It is difficult to understand, or water to describe it: sound mixer input channel and input line will have a basic background noise, the background noise is like a river sediment, refresh is not eliminated. As you know, when the water is not deep, the flow of water and sediment are the lowest, this is certainly not a good water quality. So that means if you gain adjust the dynamic range, sound source signal is like water and sand are beneath, background noise will pop out when sound is certainly not good; on the contrary when comparing the deep river, flows of water is relatively clear, must have been very good water quality, i.e. gain adjustment of dynamic range is large, more reasonable, so that the sound quality must be very well; of course, even if prevailed, is washed away, Heba river bed to the place, this is equivalent to level signal to distortion, this is not what the sound quality, and also will cause damage to the equipment, nor gain better, to have a degree, the right to do. I want this to describe the role, even if the gain is reproducing the beginner should also be able to understand it.

3. mixer Channel Equalization group adjustment: when the gain adjustment, General next to adjust the sound mixer-channel balanced group, adjust the order should be transferred from the bass part first, then adjust treble section. Because only guarantees the sound of music, can guarantee the sound good times overtone. Basic adjustment it no problem, here I only said a few skills.

Now professional mixer balance group is generally much better with a selected frequency adjustment, audio engineer will not be flexible in use, all that more difficult, some things will depend on the individual's perception, I can simply say: for example in disco music, feel the bass inadequate, I can put disco music which channel equalization group bass frequency selected on the left and right, and then use 200Hz knob for moderate intensity, this bass came out; again such as a singer of teeth tone is obviously very prominent, the authors were able to make high-frequency frequency selected on the left and right, and then use 6000Hz knob for a moderate amount of attenuation, appropriate to reduce the sound of teeth. If the use of flexible, you can also use a balanced group of selected frequency function to suppress acoustic feedback, such as General Ballroom in around there will be a 300Hz formant, often prone to this frequency, the authors are sound feedback can put the microphone input channel of the frequency selected on the left and right, and then use 300Hz knob for a moderate amount of decay, so you can effectively reduce acoustic feedback. Of course each sound field produces acoustic feedback frequency is not the same, but no matter what the frequency of acoustic feedback, you can use this simple control, of course, this requires experience to flexible control. But also the perfect adjustment of the sound field and prevent acoustic feedback is needed to use professional multi-segment equalizer or feedback suppressor to adjust, and later the surrounding system article is a detailed introduction. All in all a sound mixer, audio engineers often manipulative adjustment is a balanced set of a sound mixer. Often see stereo master faders only know sliding volume, too lazy or ignorant many hands-on to adjust the balance knobIt is used, it can be said is that every time I have needed to adjust the sound mixer to a song as an example: when the singer to the stage to introduce their performance repertoire, I need the microphone bass down to reverb to moderate or turned off so that you can guarantee the clarity of the language; when music plays singer began singing, I would need to increase the microphone, the sound of the bass will become thin, at the same time the volume increases to the appropriate reverb; in addition when singing in order to avoid the music treble snatched the microphone treble, the author can put music treble attenuation slightly; however, when the song Intermezzo, the audience's attention from the singer was transferred to the music, so this time I had a need to increase the treble of the music, while the music it up a bit, which is very good, very natural highlight music, otherwise no change would be too inflexible. But at this point I had to put down the reverb, so even if the singer in the Intermezzo suddenly speak nor a hybrid mix of sound; a section when the song Intermezzo finished began singing the next paragraph, the author who is going to turn down the music, the attenuation music treble, large microphone and reverb sound volume. The climax of the last song, I also need to put the microphone volume up a bit, and then the music volume instantaneously from small to larger, making a perfect, shock base.more climax effect to do at the end, of course, not all songs are suitable for such an operation, so do the sound engineers need is flexibility. I think the real to the mixer for each feature by writing out, you might want to write a thick book, and the effect is also not necessarily obvious, here I have space constraints, I just hope, that the author has experience using a mixer, concrete aspects depends on personal effort and learning.

4. adjustment of the sound mixer channel AUX; mixer adjustment knob on various is generally the most balanced group, then there is the AUX knob, terminology is called: auxiliary sends control. As is the secondary nature, many sound engineer on it enough attention, did not fully understand its capabilities, remember was in Beijing in 1997, learning about the AUX teacher for two days, but many students still confused, I really couldn't, it took two minutes to unlock them two days of confusion, and so after a lot of classmates see the exclamation that the AUX was so simple! certainly cannot be said that this writer that time level above the teacher, but I used a figuratively: the author said, in fact, every input mixer channel is like a big water pipes, the water flow in and basically divided into A and B are two mains: a A way mains is the volume of the sound mixer this channel faders, marshalling, etc., send out, lift the channel volume faders everyone would know; a B road mains is: AUX group, different is a sound mixer, AUX section can be divided into multiple, if a mixer with 4-channel AUX, it was like this the AUX Group B road, mains and divided into 4-channel small tap water pipe and flow out of it and the following principles, fader is simply the most AUX volume switch is used to control knob, and it's a channel channel volume switch is only with faders control, much like a big pipes even if the following into A, B two mains, and they are following and a lot of small pipes, the water flows out but still the same. So I have not only look at the differences between the surface of things, in fact, their functionality is similar. See here the most audio beginner might be is understandable, the most important thing is to understand the knob, and AUX Mixer volume faders functions the same way. Next to speak next AUX group specific use: General AUX is the most used to add voice effects, I have need of processed sound with the corresponding AUX switch sends to the effect that, after processing and flow back into the atmosphere. This is the basics, most of the sound engineer should be; the large-scale mixer will have faders AUX General before/after conversion, when set in front of the fader channel following total volume faders has no way to control the volume of this road, AUX; on the contrary it is the total volume of control channels. Other function AUX is available for listening or recording. Another easy-to-use is the author who can also be used to control an AUX audio system with subwoofer level, this requires more bass channel can turn up the corresponding AUX, without the need for large subwoofer level of sound sources, such as a microphone, and their corresponding AUX can rarely some volume, otherwise easily lead bass sound feedback. Generally understood the principle to AUX by analogy, I also do not more.

5, a mixer of balance adjustment: a mixer of the General sound engineer are understood, but a lot are rigid understanding, such as a two-channel stereo music signal input to the mixer, most audio engineer will put the two channel sound like a knob to the left and to the right to play to the end, this is the "stereo", in fact, in this case the two channel sound will appear very flowing, intermediate hair deficiency, Gravis; if the sound like knobs are hitting the Middle will find music sound top-end, sorry, but the width of the sound is not enough; the best location is the left channel of the knob to the clock of the 9 o'clock position, the right channel of the knob to the clock of the 15 points, this music will not be waving and wide dynamic range, dynamics, and penetrating and well. You can carefully on the principle of the author is not analyzed, I only pay attention to practice. Sound like other aspects of the application author does not say, are the basics. In fact, often the most simple things, come to think of it is very complex.

6, the mixer main output section of the main adjustments: sound mixer output part refers to the volume and the volume group. For example, I can put the band prepared to 1-2 formation; the microphone series to-3-4 grouping; the bass by 5-6 Group of volume control, auxiliary speaker by 7-8 marshalling of volume control, etc., in short, there are multiple grouped mixer better facilitate control. Additional marshalling can choose separate output signal or the marshalling signals entry into the master volume mixerHybrid control. Other such as channel faders etc. is very simple, but to each input channel of the flexible control volume faders, this part of the adjustment is simple but very important, mainly observe the signal input and output level signal, there can be serious distortion.

Mixer use issues

1 mixer signal input section need to be aware of the problem: it has introduced the input signal is generally divided into low resistance and high-impedance input, but how to define a way to signal is low resistance or high resistance requires flexibility. For example, in accordance with standard electric piano, electric guitar, etc. belong to the high-impedance signals, to use 6.35 plug can only be entered into the mixer, but in some places, from the stage to the connection between the mixer is too long, the line of resistance, together with the lighting system interference, so that the signal line background noise is very large, even if you do not enter any audio source signals, in a mixer on this line the input channels of the gain on metropolis has a lot of noise, as described above: this line is a river that now this river sediment has too much, nor is this line in the noise a lot or not convertible, and the line side of the instrument's sound volume is way up and no longer increases, the river can only give you the deep water, what should we do? if you are using high-impedance input signal is equal to the water in the river water is not without increased, sound quality can be changed, of course, no way to change; if you use the card you unplugged from low resistance Jack input signal, the river of shallow water will be after amplification of low resistivity amplifier so that the depth of water, water quality, sound quality is fine. That seems not quite true, everyone can try. I now do a lot of work, the band are all used the card Lennon interface from low resistance type, although not standardized, but is in fact reduce the band noise. So audio workers need to be flexible, pragmatic, practical search for the best way to work.

2. AUX sections need to be aware of the problem: I know there are faders AUX front/rear conversion, standards compliance, listens to signal to the stage with faders sent before, but in General or in the performance of which faders and sent. AUX signal used to listen to the stage as an example: I have two computers with AB CD machine took turns playing music, when A single music out I would pull down this road, you can turn off the volume faders sound, then the road B volume faders to push up. But at this point A single CD player could play disc, still in play, then if it is sent after using faders AUX signal, stage speakers, will not have A CD out of the sound, but if it is sent before using faders AUX signal, stage speakers will be the voice of A single CD sent, so the stage speakers up at the same time have A, B two CD machine voice, singer there is no way to listen to, although this time the master volume on the outside and is not affected. Therefore even send some author AUX auxiliary are also carefully adjusting.

3. Group allocation problems: marshalling areas need to be aware of the problem is quite simple, since all marshalling of volume can separate output without switching into the master volume, which requires the author to group the careful, for example: I used 5-6 Group to control the volume, bass sound mixer on most of the input channels of the Group 5-6 can continue, but if you are going to seriously, the microphone channel or press the microphone channel 5-6 Group produces bass sound feedback; it is now 5-6 group I have from behind the output independent output signal, and it is no longer passed the total volume output sound mixer, which is 5-6 marshalling to the total volume of the mixing console switches no longer pressed.

4, illusion power: most of the mixer will have within a 48 volt phantom power, which can be used to promote a variety of capacitor microphone, but because it is from the microphone line transmission of electric current, so always check the phone line, that line, otherwise the line contact when it makes a lot of current impulse sound. There is also a phenomenon that is: If you use a mixer with a battery of capacitor microphone, do not open the phantom power, otherwise they interfere with each other, make it rain "sand" in General.

5. recording input: most of the audio input channel mixer is a simple control and then directly through the sound mixer total volume output, so carefully, do not produce malfunction, suddenly the voice of the audio channel from the master volume on a mixer.

6, output level: the authors are aware of the standard level is recording 0dB, but actual performance generally exceeded in many or even reached + 10 dB, so don't see red light is a great start, but in real use, slightly exceeding the signal level is reasonable, then out of the sound effects are also the best. There is one thing to note is that when the peak indicator reaches + 4dB, rear and its corresponding output volume level before reaching 0dB 0.775 volts.

7, some functional buttons: in addition to important adjustment knob on the sound mixer are multi-functional knob, button, or switch, for example: positive and negative phase transitions button, high removal or low removal button, button, before and after conversion Fader Mute button, buttons, etc., some monitoring is often used by authors who are skilled, not often used in understanding the basis of its basic functionality, do not go to regulate them, lest we produce misoperation.

8, headphones and sound field effects: a lot like Master Chief has been tuned with headphones, headphones are very important, but the headset voice after all and onsite voice vary greatly, so I'm going to listen to the scene. Not unrealistic, wishful thinking to headphones as a point of reference, when you want to know in the sound recording, the headset can be used as a standard; in the scene when the headset is just a tool, but the standard is the author of the ear, to listen to the scene.

Where some of the important functions of a mixer and operational skills are also essential is said to have, there is one thing to declare: this technical article is to look at the broad underlying audio workers; thoseAdvanced theory, high-tech, let people see the clouds fog article is expert characters to the expert or experts look after all, the basis of! majority, they sound workers more need is easy technical articles!