I don't mean to squash anyone's hopes for the RAC, but I've owned many real time analyzers, and to date, NONE have been able to EQ a room better than I can ... at least to my ears. "Flat" is almost never right, and anything else is a judgment call - and I have been very happy with my sonic judgment as far as live sound goes. Now, my life choices .... hmmmm, not as successful. lol
My advice - LISTEN. Try to EQ the room with your eyes closed. Don't look at knobs - just make it sound the way YOU hear it. Define YOUR sound, and your following will decide if it's for them. I've been blessed with an educated following for my entire carreer, and they have always loved my sound....as I do. Be happy.