First, the main channel music debugging
The contents of main channel music before debugging stage are: low shear and high shear, gain, input and output equalizer limiter, equalizer, volume.
1, the main channel music cut:
This is a very important debugging project in the previous music debugging, debugging is properly related to the overall performance of the music, must not be ignored; low frequency is the basis of sound, the sound of all from the low frequency start.
What are the pros and cons of bass performance? The music will be lost if the lack of bass fullness is thin, if the super bass sound excessive turbid procrastination. If the sound of the music is missing, it will lose strength, and if the bass is too loud, the sound will rumble. And how much of the bass? This has nothing to do with the low cut, only a fool and deaf will be main channel music to low point in low frequency.
Low cut adjustment is also adjusted, but it is a rapid, intuitive and simple manipulation is balanced, low cut-off frequency sharp decay. There are two indicators on the low cut, an attenuation and a low cutoff frequency.
Attenuation refers to the value of each octave sound pressure reduction, such as 30 Hz than the 60 Hz sound pressure of 12dB, then we call it 12dB attenuation per octave. The attenuation of low cut is a fixed value, the production of different levels of the previous. Low frequency cutoff refers to "reach frequency fixed attenuation". For example, when setting a low cut point is 40Hz, is the expression of the 40Hz frequency point than the 80Hz reduced by 12dB, then the 20Hz frequency point is reduced by 80Hz compared to 24db.
How to set the main channel music low cut, there is no a certain value, according to different environments, different speakers were treated. Super bass and bass volume and amount of both speaker (speaker on different large, also related to the environment) (bass reflex accumulation).
There is a need to know is: to replay the sound frequency is low, the need for speaker amplifier power amplifier power margin is greater, when the system match the shortage or sound power to bear ability is not strong, appropriate up low frequency point is a wise, will get better sound performance.
To determine the main channel music low cut frequency but also understand the resonant frequency of the main speakers (often referred to as F0), is the effective bandwidth speaker marked the starting point. Before the main channel music low frequency point in general to choose at this frequency, if the selection is too low, the speaker by their own physical characteristics cannot replay such a low frequency signal, not only a waste of power amplifier reduces efficiency, but also cause serious effects of low-frequency texture speaker unnecessary burden.

Before the main channel music cut adjustment is very simple, some of the more difficult is the basic principle of the above said. Field debugging of main channel music low cut as long as the repeated move up and down the parameters, even debugging novices, just by hearing can easily find the best values.

2, microphone low cut:
The microphone is a kind of special way to deal with the microphone balance, the principle and the music before the introduction of high and low, the operation is quick and easy.
The microphone level cut processing means of various design of first stage not the same, some design is the direct sound and sound effects separately and have high and low cut function, the processing scope is: direct sound low cut the range of 20 - 200Hz, 8KHz - 20KHz high range direct sound; echo sound effect low cut the range of 20 - 250Hz, high acoustic echo effect range of 300 - 20KHz; acoustic reverberation effect of low cut the range of 20 - 1KHz, 4KHz - acoustic reverberation effect of high range 20KHz.
Is there any criterion for the high and low level adjustment? No Because there is no fun to play KTV equipment, but also brings the difficulty of debugging KTV devices. Peers who looked down on the KTV DJ, in fact, do a good job of KTV DJ its difficulty as much as the performance of the DJ. There are no rules that don't mean to come. Collocation KTV debugging to cope with the changing environment and different equipment, all processing techniques must be due to the time and equipment, and situation, but there is a common and regular follow.
For low cut microphone processing, mainly in the following areas:
(1), the microphone straight to the sound of low cut can not cut as far as possible not to cut. Bass is the voice of the foundation, is the best part of the sound, if sound is an ideal environment (only a hypothesis, in fact there is no), no bad standing waves, but very low frequency cut off, the result will only be thin voice.
The low frequency response of the microphone is an important parameter to measure the quality of the microphone, if the low-frequency response of the microphone is straight down, of course, the lower the better. If we can assume that if is excellent low frequency response of the microphone, it has not produced peak and valley in the low frequency region, we have absolutely no reason to force the direct sound microphone as low cut, cut off the only result is the loss of warm, thick vocal trait.
(2) the effect of sound cut must be cut. The direct sound we often referred to as "the sound of the bottom", also called "dry" is the sound foundation; sound effect is removed part of the processing from the direct sound (delay and repetition) and then added to the direct sound on "ornament", also known as "wet sound". The microphone is not only the level before debugging the parameters of debugging sound effects, more important between the sound and the proportion of dry and wet sound overlapping bandwidth. If the proportion of wet and dry wet sound sound sound will be too little, lack of moisture and is straightforward stiff; if the wet sound too much, the sound will be sent false and inadequate.
There are few people pay attention to the dry sound bandwidth overlap, ignore the importance of the problem. The low frequency segment of the microphone should be less effective and more direct sound, so that the voice will appear solid and strong; if the low-frequency sound effect of the microphone too much, the sound will be fat, empty, empty.
I often phone when debugging such processing: direct sound low point hypothesis microphone is 70Hz, then the low point effect sound according to different use of the environment between 110 - 160Hz, will not be low cut and the same frequency of direct sound.
(3) sound environment 150Hz low frequency under standing wave must be cut. Performance of acoustical design KTV on the final sound is critical, even the sound system and excellent in bad environment will be changed. The real customer satisfaction KTV sites is not much, the entertainment boss is not satisfied, the screening equipment repeatedly, but the vast majority of the effect is not ideal, "the curse is caused by the sound environment. Don't say is the design of KTV decoration acoustical general is not reasonable, is designed to do a special test equipment manufacturers KTV room also find some good.
Low frequency standing wave is a common problem of bad sound, low cut is an effective means of fast processing. When we try to feel if the microphone low-frequency sound, you can try to slow down the microphone frequency points slowly move up until it is clear. Low point settings generally sound effects should be set higher than that of the direct sound, so sound cleaner, but also can not deviate too much, otherwise the sound will be dry, lack of fullness.
Again, although the low cut microphone is simple and fast, and have practical effect, but have to say that this is not the best treatment means, alone to deal with low shear acoustic environment could not be achieved very good results, in order to better use of the equalizer is the right way.
3, the microphone at:
The fundamental frequency of the human voice varies from person to person, but the highest is also 1050Hz. More than three octave vocal harmonics to the fundamental frequency is very weak, is talking voice tube reduction to about 8KHz as long as you can basically. Nowadays many people also simulated machine on the old mind, think analog digital effects are more than warm, listen, sing good; simulator effect "low pass" is about 8KHz, and no one will feel high enough.
This is the high effect microphone a parameter setting is not too high, too high will only add some of the spiked edgy sound, especially in some hard to reflect the strong, diffusion difference places. In general, the direct sound high can be set in the 16KH or even lower, high echo effect should not exceed 12KHz, the effect of reverberation to the appropriate higher, at about 15KHz. Direct sound and sound effects of high point set was also noted:
High point higher than the direct sound or sound effects, high frequency sound will lack density, seemed to be very light.
4, auxiliary channel high cut:
Auxiliary channel