"wall of sound" with delay (avid venue)

hello everyone !!!

The situation is this: we are on the stage of a theater of medium size and indoors, the arrangement of the ensemble consists of two files, the rear where there are to the

left a string quartet, at the center an accordion and on the right the percussions, in the front row two classical guitars amplified with microphones now: the front row is two meters and 50 from the rear row (so just as an example). The Question: to give the feeling that the sound arrive simultaneously i'll give a different delays of x ms to microphones of the rows so the sounds(delayed) of the back row and front comes "simultaneously" to the public through the sound system, but this delay that I gave will it go to the monitors (aux) of the musicians ?? how can i avoid that this delay come through the monitors ??? I unfortunately do not have a digital mixer, so I ask to you.

thanks and sorry for my English

I am attaching a picture of the channel strip software for digital mixers and Venue of the delay in question