I run only a DCX for my line arrays. I don't need more EQ ability. Why don't you try a simple setup first [DCX only] and try to extract the most out of your array before adding another piece of gear? A Parametric EQ is more precise than any graphic equializer as it allows you to change the frequency, gain and Q. It's good to zero in on problem areas but the graphic EQ might have more control over the wider spectrum if the whole audio system is out of whack. If the DCX isn't enough, add another EQ.