Feedback Suppressor--A Common Human Operation Failure in Professional Audio.Qingdao Conference Room

　　The last issue of professional audio common human operation failure, let's talk about the feedback suppressor. The main function of the feedback suppressor is to prevent the system from generating feedback and protect the speaker equipment. The following points need to pay attention when adjusting the electronic crossover. and troubleshooting:

　　1. When using the microphone to suppress the feedback point, it is best to find a few microphones that are often used, and constantly change the position of the microphone during adjustment. You can also put a little background music or speak some words into the microphone during adjustment. This can make the sound field more active, which is more conducive to finding the acoustic feedback frequency accurately and quickly.

　　2. If there is a compressor in the system, pay attention to connecting the compressor directly, and then restore it after adjustment. And other audio processing equipment in the system, such as mixer, equalizer, exciter, frequency divider, effector, etc., should be adjusted to normal working condition.

　　3. Pay attention to check the resolution of the feedback suppressor used in the system to the music signal and the microphone feedback signal. The detection method is: turn off all the microphones, connect the feedback suppressor in series with any channel with music signals, and then the most It is good to play a disco music, and continuously increase the volume of this channel. If you find that the feedback suppressor starts to work and seriously affects the sound quality, it proves that the feedback suppressor is not perfect.

　　4. One thing needs special attention: if you have adjusted the feedback suppressor, do not press the Reset button during the live performance, because this will clear all the parameters you have set before, and reset the feedback suppressor. It has become the original state of the factory, which is very dangerous. The system is likely to have a strong whistle, and even damage the equipment in severe cases.

　　5. Some feedback suppressors have automatic and manual working modes to choose from. If you think your adjustment is perfect and the system will not produce acoustic feedback, you can put the feedback suppressor in manual or locked working mode, so that It not only retains the original parameters in the device, but also does not change the adjusted parameters due to the device's misdetection and mis-start.

　　6. Another point: the feedback suppressor cannot both suppress the acoustic feedback and adjust the sound field. To adjust the sound field, a special analog multi-band room equalizer or professional digital parametric equalizer is required.

　　Feedback suppressor failure example

　　A friend once said that since they added a feedback suppressor, the sound has become very dull. I knew it was the problem of the feedback suppressor, and I must have regarded the normal music signal as a return signal to "suppress" it. So clear all the memory parameters in the feedback suppressor, restore the factory settings, and then find the return input point of the microphone and put the feedback suppressor in the manual working mode, so that the fault is eliminated. Many sound engineers complain that the sound is not good after adding a feedback suppressor, which is actually the above problem.

　　Of course, we should not be naive to think that adding a few feedback suppressors can 100% avoid feedback, and don't expect the current feedback suppressors to be able to distinguish 100% which are music signals and which are microphone feedback sounds. The situation is that the normal music signal is often suppressed beyond recognition by the feedback suppressor, while the harmful microphone feedback sound is not well controlled. There are also some sound systems in which there are too many acoustic feedback points, and the 10 or more filters per channel of the feedback suppressor are simply not enough. Therefore, the use and evaluation of feedback suppressors should be viewed by the benevolent.

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