I assume the G91a has a center channel out as well as the 1/1 etc. (I'm using an older meridian) Go to the left/right speaker with the digital lead and a comm from the front out then go out from the left/right to the other speaker. (make sure to tell the speaker if its a left or a right- see the manual) Then go to the center chan with a seperate digital lead in the center out and a comm its the digital leads that are important the comms can be chained.
