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I had this problem at one point too. The much better fix would be to use the speaker matrix processor on one of your FX channels — do it the right way across the whole system instead of fixing it for just your effects.. Set your mains up as L/R/Sub, then use the speaker processor to spread the L/R/Sub signal to L/C/R/Sub. Information about it is in your manual, but in case you don’t have it go here and look at the bottom of the 2nd and top of 3rd pages https://www.allen-heath.com/UK/CategoryDocuments/iLive_Rack_FX_Emulations_rev3.pdf.