】 【Weak current College (go) expert detailed professional audio troubleshooting tips (5 )---- Power By】 【China power house network.

(5), the feedback suppressor: feedback suppressor's main function is to prevent the system produces a transfusion, protect the speaker device, following that adjust the electronic divider need to pay attention to some problems and troubleshooting: 1, in the use of microphone for feedback point suppression, it is best to find a few frequently used the microphone, but when you want to continue to transform the location of the handset, you can also place the point when the adjustment of background music or microphone to speak some words, which can make the sound more active, more precise and fast find acoustic feedback frequencies. 2. the system if you have to press the device, also note the compressor for pass-through, and adjust the completed and then restored. Whereas the system of other audio processing equipment such as a mixer, equalizer, Exciter, divider, amplifier, etc, to adjust to normal working condition. 3. takes note of the detection of a system in the feedback suppressor on the music signal and microphone feedback signal detection method of resolution is: turn off all the microphone, the feedback suppressor thread in any of the music signal channel, it is best to put a disco music, constantly increasing volume of this channel, if it is found that the feedback suppressor started working and serious impact on the sound quality, it proves that this feedback suppressor is not perfectly. 4, there is one thing to note: If you have to readjust the feedback suppressor, the on-site performance, do not press the Reset button, as this will give you a previously set all parameters in the clear, the feedback suppressor into just the factory's original state, it is very dangerous, the system will probably appear strong screech, serious but also equipment. 5. some of the feedback suppressor with automatic and manual work mode, if you think you have a perfect adjustment of the system does not occur with acoustic feedback, then you can leave feedback suppressor on manual or lock mode, so that both preserves the device in the original parameters, not because the device error detection and false starts and change the parameters have been adjusted well. 6, there's one more thing: feedback suppressor is impossible both inhibit acoustic feedback and adjusting the sound field, adjust the sound field need to have a dedicated simulation multi-segment room equalizer or professional digital parametric equalizer. Feedback suppressor fault example: 1, a friend and I said that since they there plus a feedback suppressor after the sound becomes very boring, I knew the feedback suppressor, definitely bring good music signal is also used to signal to the "Suppression", I went to the feedback suppressor of memory parameters all clear, restore factory settings, and then put the phone back to lose points after they find again the feedback suppressor in manual mode, this failure is ruled out. Previously a lot of sound Division complaining about the feedback suppressor sound but not after, is actually the above issues. Of course we do not naive to think that with several pieces of feedback suppressor can 100% avoid transfusion, also don't expect current feedback suppressor can 100% tell what is what is microphone music signal feedback sound, the truth is good music signal often give feedback suppressor suppression, and harmful microphone feedback sound but not very good control. There are also some audio system acoustic feedback point too much feedback suppressor per channel 10 several filter is simply not enough. So for feedback suppressor use and evaluation or benevolent see benevolence Moses.

(Vi), digital effects: digital effects is processing, the manufacture of various sound field effects, reverb effect audio peripheral equipment, the following talk when using effects need to be aware of the problem and effects of potential failures: 1, in construction, to artistic and professional, many technicians like the effect is installed inside the Cabinet, this seemingly normal and reasonable, but due to the effect that the most vulnerable to outside interference, the Cabinet of equipment, plus a mixer from the Cabinet to the longer between signal lines, these are serious interference effects, causing effects to the sound mixer in the signal has a lot of noise, serious may all be noise can't use. So when the device is installed, it is best to put the effects on the side of the mixer, but don't and wireless devices such as microphones, drive stacked together. This is convenient, flexible transform what we need; then one of the most important thing is to reduce the interference. I believe there are many audio engineers are not aware of this, we can do the following experiment. 2, there are some effects when we select a good program, you also need to press the "lock" key, otherwise the program numbers have been flashing, indicating that this program has not been activated, then unless we know the original common program, do not blindly to lock another our unknown effects program, because some of the effects programs sound more "terrorist and weird", some programs of the signal output level is also very high, if you accidentally select a program, that may lead to MIC severe transfusion or serious deterioration of the human voice. 3, now most effects transform from one program to another program, the Center is to have a conversion time of the effects have no effect in the output, although only a few seconds, but if you show them transform effect or be aware of, we should try to avoid this phenomenon. 4. effects if action is not at that time, also produces acoustic feedback, this kind of feedback is sustained sound General, unlike the microphone acoustic feedback is short and strong, for example 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. Of course, a sound system that you want to have a good voice effects alone is not enough to handle, you also need to be issued in the system is very good and direct access to the sound, and then combined with the appropriate sound effects, it is only possible to achieve perfect vocal effects.

(VII), professional audio-delay: delay can make through its audio signal delay treatment, some people have calledIt delays. The following talk about using delay-time need to be aware of the problem and delay is prone to failure: 1, in audio system connection delay unit, be sure to notice the object, if the delay in connecting the delay delay unit to get back an object, the consequences would be imagined, this time the sound becomes more procrastination, fuzzy. 2 and now audio system a lot use digital sound processing devices, commonly have 2 to 4 to 6, 8 and 8-in 8 out of several, the brand is also quite many, such as the United States: EV, dbx, ETC, etc, and these branded digital processor feature comparison is complete, all the built-in delay function, but because of the different products of different brands, so adjustment is also not the same. Our United States ETC of digital sound processor DLP4080 as an example, the processor offers 4-channel signal input 8-channel signal output function, in the 4-way input and 8 output channels are all built-in delay function. For example, in a stereo total volume output and Mono total volume output mixer, we can use DLP4080 digital speaker processor time delay function: a 2-way, we will be the main audio signal input to the digital sound processor DLP4080 1-2 input and then assigned to 1-2, and 3-4 output channels, we can take 1-2 output channels available to the main speakers use the main speakers in General is not required to delay processing, so this time 1-2 output channels you don't need to delay adjustment; we can take 3-4 output channels available to secondary speakers use, if the auxiliary speaker distance between the main speaker for more than 20 meters above the sea level, we can consider secondary speaker delay processing, that at this point as long as the DLP4080 3-4 output channels accordingly delay processing. B, we will a mixer in 1-channel Mono total volume output audio signal input to the digital sound processor DLP4080 3rd Road, enter, and then assigned to 5-6 output channels, we can take 5-6 output channels available to bass speakers use, since the bass speaker's voice, inherent delay sense and so are not needed on 5-6 the two channel delay processing. C, we will be the way to a mixer AUX audio signal input to the digital sound processor DLP4080 4-channel input, and then assigned to 7-8 output channels, we can make 7-8 output channels available to stage za, za from actor on the stage, so the closest we can make the appropriate for za, this convenient delay processing actors hear system sounds in other sound box, we simply DLP4080 of 7-8-channel or the 4-way DLP4080 input channel, select the appropriate delay processing. Of course, the above example has 2 Mono signal input, if we pursue what stereo input that can be increasing device, or use the 8-in 8 out of the digital sound processor, but also to take into account the cost of the equipment. Use the digital sound processor to adjust the delay time is fairly simple, flexible, you can completely replace the traditional professions of digitally, as the future popularity of digital audio products, audio engineer to keep on learning the new knowledge.