Global EQ

I have a problem where my sound is pristine at home on my PA and when I go to rehearsal it sounds like a nuclear bomb with way to much treble. I'm afraid to touch my strings! Our sound guy refuses to or cannot fix it. Is there a way to have a global EQ for my output 1 which goes to the PA and not have global EQ on my output 3 which is going to my amp?
 
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