Iain,
There is a x-over on the sub (albiet from a Bose system controller). Unfortunately for me, the install is all Bose, supplemented by JBL SR-X's on sticks on the stage. I've moved two of the Bose subs to the center of the proscenium, and the other two (dead hung in the ceiling) have been disconnected.
Currently, I have control for all speaker positions in that DX8. Also, all Bose speakers are being processed by Bose system controllers. Near as I can tell, these just apply some EQ and x-over (which I can bypass and do in the DX8 if I so desire).
I do plan on downloading the trial of Smaart to attempt to EQ and make sure delays are properly set (I say try because I have only tried Smaart one other time, and that was several years ago).
FYI, these curves were put in place by a previous Facility Manager. He played pink noise and viewed the results on an RTA, then attempted to flatten the response.
Any tips on improving low-end intelligibility in a concert hall environment?
-Jordan