The main function of the feedback suppressor in the professional audio
system equipment is to prevent the system from generating feedback and protect
the speaker equipment. Here are some problems and troubleshooting that need to
be paid attention to when adjusting the electronic frequency divider:
1. When using microphones to suppress feedback points, it is best to find a
few microphones that are often used, and constantly change the position of the
microphones 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 detecting 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 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 that 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 the feedback
suppressor will be reset. 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 that your adjustment is perfect and the system will
not generate acoustic feedback, then 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.
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