I have had this mixer for two years and really enjoy the sound quality, FX, portability and versatility. Recently I discovered that occasionally a "rushing" noise (the noise floor) will be higher than usual in both my monitor and PA mains. All I need to do to eliminate it is push down firmly on the "AUX" trim for the channel (if it is in my monitor) or the Level knob if it is in the PA mains.
Sometimes, if the "rush" is in the PA mains, it is also eliminated by pushing firmly on the AUX trim on the channels I am using (it is usually only caused by one channel, even though I may have 3 active).
What causes this? I am accustomed to swiveling trim knobs to clean them on many pieces of equipment I have but these channels are used regularly and should not need cleaning.
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