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Intermittant Big Noise

I am a new to this forum.
I am using Soundcraft Si Expression Mixer.
There is noise problem during operation. It does not happen always. Sound Level and Noise suddenly jump up and disappeard immediately or several minutes later. I have checked sound level later, but I did not find any problem.
Have anybody experienced this kind of problem? If soeeone experienced before and found the cause of problem, would you let me know?
Thanks in advance.


  • I just bought a Soundcraft ui24r and channel 13 is unusable because of the noise on it--unless you want to eq out all the treble. Very frustrating. Obviously my mixer is different than yours and the root of the problem is different, but we both have Soundcraft mixers that are not functioning 100% correctly.

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