My take on all this is that DRC can be a very effective complement to room treatments. I have used a DBX PA, a Lyngdorf, and now own a DEQX hdp-4. Used in two different systems all have made an audible improvement to my listening experience. However, the better the speakers and the better the room the less audible improvement is heard as far as equalisation is concerned. That said, the DEQX brings recorded music into focus in a way that equalisers like the DBX cannot. From my experience I would recommend both the Lyngdorf and the DEQX, though the latter, as you know, requires some skill to set up.
