You are quite correct. Speaker arrays (same drivers outputting same frequencies) are best avoided except in the bottom two octaves (assuming one cherishes precision). You get lobes in response as well as comb filtering of certain frequencies which makes the audible response much more variable than a point source.
As I stated earlier, the issue is the relationship of the driver spacing to the wavelength. In the bottom end, the wavelengths are large enough that the relative placement of the drivers is inconsequential. I was surprised at the resistance to this issue here as I thought it was a fairly well-known matter.
All I know, is that where I have set it up, it sounded fantastic. Not sure of the physics behind it, but the 2 MMG's emitting the center works very well in a home theater I set up for someone in my neighborhood, who didn't want to give up his MMG's.
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