Dbx Live Jacket How Can I Improve The Sound In A Very Live Hall?

How can I improve the sound in a very live hall? - dbx live jacket

I need her to dance in the ballroom of an oval shape to take with a live band at one end. The room is very modern (lots of echo).
I have a PA that a powered mixer and a pair of speakers + EVsx100 covers. He also manages the band instructors.
I wonder if the processor can drive rack dbx DriveRack PA Processor used in this situation and whether it would be no difference in the overall sound. I also wonder if the speaker will help more.
The program includes a call-based dance and violin acoustics.