Just to clear up some confusion that people have about these types of systems.
They CANNOT take away reverb-only add it.
So the room has to be close to "dead" to begin with, THEN you can add reverb as needed.
I have installed several of my "redneck versions" we used to call "Beaverbs"
One that worked out very well was to "copy" the acoustics of a large room to a small room.
There was a 2500 seat Church that had a replica of the choir loft in the choir room. But since there was no "rest of the room", when the choir practiced-it was quite different than when they sang in the Sanctuary.
So I took a lot of acoustical measurements (using TEF polar ETC) to find out where the reflections were--the level of them-the response etc, then put speakers in the right places in the choir room and added the reverb and reflections in the right places.
While not perfect-it was scary close-and MUCH less expensive than the real system.
As I used to say-I am not trying to fool European acousticians-just some Southern Baptisits---------