Ivan,
Sounds like you have a good amount of experience with these systems. I am trying to keep an open mind with this approach, but my experience has not been positive. I am adhearing to all of the rules when assigning inputs, and I understand well the principles behind the design and proper utilization of one of these rigs. But I still am not happy with the results. I do believe that the installer's calibration and set-up is perhaps flawed and contributing to my ill perceptions.
The main thing that bugs me is if you adhere to the bussing principles you are essentially setting up 3 discrete mixes. For the sake of keeping this simpler we can call it 2 discrete mixes, a ctr mix & a L/R mix. As instructed in the AES papers, (
http://www.sound-technology.com/Research2/Multichannel%20Mix ing%20AES01.pdf), nothing is to be bussed to multiple mixes, everything is discretely bussed to either ctr, L or R. With Kick, snare, percusiive instruments, lead vocals going to the ctr mix and all other instruments discretely going to L or R (everything must be double mic'd and discretley assigned to L or R), you now have 2 programs that are completely different in their respective content.
So it is absoultely essential that all 3 speaker clusters have a perfect balance (SPL & freq response) of each of these mixes, otherwise you end up with multiple programs coming from multiple locations. When I walked through the listening field, and placed myself in proximity to one of the L or R clusters I could distinctly hear a program content (my L or R mix) that was different than the program content that I was receiving from the Ctr cluster, and vice versa. Yes I can hear some of the Ctr in the L or R and I can hear some of the L & R in the Ctr, but not a seamless blend in such a way that the individual mixes were indiscernable. So now I not only have multiple sources arriving at my ear, I also have mutiple programs arriving at my ear. This is chaotic nonsense.
The fact that these systems are so highly susceptible to misuse since they require exact adherence to source mic'ing principles and signal routing, and furthermore take the uptmost precision in the installation & proper deployment of such systems is enough reason to dismiss them as incapable of providing consistent reproduceable results in a church environment that is going to involve multiple users who are most often not skilled enough or of the volunteer nature. I would have a hard time sleeping at night if I was advocating the use of, selling and installing these systems in churches. The end product when it is not dialed up with exact precision will be far worse than any mono rig, or alternating L/R rig. That point can not be argued.
B. Parenteau
Showmix