【 Weak current College 】 (go) expert detailed professional audio troubleshooting Mi-2---Power By 【 China power house network 】

Third, the sound system to operation breakdown "Science and technology people oriented", is not bad, then good, then advanced equipment to people to action is, of course, the people will make mistakes, resulting in the sound system in a number of operational failure is inevitable. We can only strive to learn and strengthen their own, temper their, accumulation of experience, try to avoid human errors caused by the fault.

(A), signal connection problems: on the audio system connection I have been told earlier in the article, then refine it here: 1, onto the playback device and connection: all kinds of sound mixer CD, DVD, MD, deck, with its accompanying wire connection with mixer, generally in high ports. 2 dynamic microphone and cable, capacitor microphone, XLR Plug in general low resistance port. But wireless microphone signal is amplified through the receiver, you need to experiment to know into which of the port. 3. principle the band equipment output signals to plug into high port, but if the line is long, interference, can plug in low resistance signal port. Other sources of signals are can do the following experiment to see what kind of port input is appropriate. If the input to the mixer's line has a problem, it's very troublesome, most afraid of is the line is not bad, but no sound, accompanied by intermittent noise, so the signal line we sound best yourself and connect, do have bottom before maximum avoid failure.

(Ii), device control problems: audio equipment is very wide, for our sound engineer, to put it on each audio equipment are adjusting well, we say that the fault of human action mainly occurs in the performance period, such as: the silent, staccato, transfusion, noise, etc., the following we will explain them vulnerable people-operation breakdown of common audio device:

(A), the mixer: we usually put the mixer analogy into a sound system of the heart or brain, thus producing a mixer is also for operation breakdown of audio equipment, sound mixer for operation breakdown usually manifested as: silent and sound is very small, distorted, sound suddenly big or small, serious and transfusion, visible noise, etc.

1 mixer channel level attenuation switches: sound mixer before the gain knob a 20dB attenuation switch around the level, such as when the CD audio sources from the high-impedance input come in, because the level is high, you may need to press this switch the sound source signal attenuation is only appropriate, but 20dB some sound engineer in the performance if you accidentally press the switch up, that is: the boss is very angry, very serious consequences! now voice signals without attenuation suddenly big 20dB, consequences can be imagined, light all the listeners will be scared out of his chair jumping up to part of the sound equipment will be reimbursed on the spot, so we're on every knob or switch for adjustment must have clear and explicit purposes, do not blindly.

2 a mixer gain adjustment: some sound teacher does not know the importance of channel gain, on the knob readily confused, and sometimes to gain knob to switch off, even while the 20dB level attenuation switch, like this time of how small? far SNR of music and dynamic, and if so it is with the microphone channel adjustment, the singer was only luck was shouting days will not have high extremely penetrating voice; of course there are some sound teacher likes to gain to large, for music, is looked up stiffly, but music singer to laugh a bit a loud like flood broke the dam, was unable to control, high voice becomes like breaking the gong or explosive bean-like noise, because the level is too large-signal has been severely distorted, also in this case the receiver will often return to lose. This shows gain important, maybe it will cause a performance during the accident.

3. adjust the sound mixer balanced group: mixer as the name suggests is used to adjust the sound tone, adjustment or mostly depends on balancing group, said that is straightforward, the is nothing more than high school bass plus several corresponding selected frequency knob, while tone under normal operation does not necessarily have to be very good, but will not show accident occurs, but some of the sound engineer on balance knob sometimes boldly goes, I see this sound engineers will find alarmed, if the bass to the great, the whole amplifier and speaker's burden is greatly increased, may damage the device, the sound can also be easily distorted; if the Alto treble added to very large, the loudspeaker is dangerous, upgrade balance knob to a degree, excessive lifting produces unpredictable failures.

4. adjust the sound mixer AUX: we all know AUX primarily used to send signals to the effects, in a mixer, if we send a signal to AUX6 effects, after effects processing to output a 2-channel signal to a mixer of 23-24-channel, then at 23-24 in the two channels will stop AUX6 knob is turned on, otherwise just after effects processed signal will then flow back into the effects. Thus, AUX and effect between will also form a loop, when the loop level gain exceeds a certain range, it will result in acoustic feedback. In addition, AUX questions before and after the faders to note that the details in my previous article have talked several times.

5, mixer sound like: sound like a knob Hello want to make it as easy, sometimes we use only the total output of left or right channel output volume, then the sound image will note, if you use total output right-channel output signal mixer channel sound like all play to the left, then at this point the silent failures, or just the opposite.

6, listen and mute switch sound mixer: General mixer listens and mute switch is close together, the action must look carefully at the time, often in the press will fault monitoring switch pressed the mute switch, that cause silent failures. Remember there is a disciple, wearing headphones, in principle, all the way to go, he listens to the signal by several channels also accidentally male singers channel mute switch is pressed, the results of his own wearing headphones and enjoy pure sound to the band, the singer was holding a microphone ran over to kick tone control room door operationBe careful, and live sound engineer cannot always wearing headphones, so there is no overall concept.

7, mixer marshalling issues: group to channel the sound is, of course, easy to control, but as the Group button smaller and more, so be sure to carefully, there are times I finished a project after acceptance to the dance hall audio engineer, I put all the musical series at 1-2 formation, singer microphone series in 3-4, when the band is 1-2 group is turned on, when the playback singers CD or MD 1-2 when grouping is turned off, mainly in order to reduce the noise, but at this point a female vocalist microphone sound is very small, only empty effect sound there is no direct sound, I ran to the mixer where a look at the original singer microphone to the addendum to the 1-2 group, said the band in concert at 1-2 group open, now on CD accompaniment is 1-2 Group switched off the microphone female singer sound natural, then I get the female singers that channel 3-4 grouped according to the group by 1-2; failure to exclude, on this aspect of the mistakes I think a lot of audio engineers have had; also some advanced mixer with marshalling mute function, for example, we want to put the sound mixer 1-10 Channel series to marshalling mute 1, when you press the button mute Group 1 total, 1-10 channels are muted. So has this capability a mixer on marshalling mute operation must see clearly.


8. Insert the plug out of the mixer INS Jack: some do not understand this audio in Jack on how to use them, if you accidentally put the plug INS inserted sound mixer out Jack, insert a TS connector of signal cable to the sound mixer that road total output will not sound. This area describes in my previous article also talked. 9, sound mixer interference sources find: sometimes sound mixer, there will be interference noise, all tap channel switch is closed, simply open the total volume of the mixing console, there are a lot of noise out, this time we can put on headphones yilulu listens, and see what all the noise is the sound mixer, or sound mixer yilulu Eagle's input line and even output line, and so on which all the noise to disappear, you find the source of the noise. On how to deal with interference noise in the following article will tell.

9, the Mirage power mixer: 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 may interfere with each other, can make it rain "sand" in General. Now some will open Mirage power mixer makes a lot of current impact sound, so be careful operation above is in operation mixer is prone to failure in some respects, of course, there are some interference problems in the next article. Recently received a lot of friends messages and information, some comrades still want me to write more then pop up, I feel like a woman like long-winded, if someone still does not know that I only have the opportunity taught him! I the original intention of the future or do you want to make easy technical articles to the end, the real-base "working people" service!