| One possible theory?
Hey glad to see that others have noticed this too ... I use small AB config a lot and noticed this phenomenon. I put it down to the following:
The Omnis become progressively directional as frequency increases. At higher frequencies they are almost cardiod and therefore are only "accepting" these sounds from the front of the mic whereas at lower frequencies, they are accepting sounds from all around. In smaller rooms this is immediately noticeable above and beyond the room modes. So the room reflections are an essential part of this.
In open air venues where there is no side and back reflection my guess is that the spaced omnis will not exhibit this behavior. This is just a guess.
I could be really, really off on all this so please feel free to ignore and move on with your discussion.
Baithak
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