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Originally Posted by pkautzsch As long as the source is in the intended angle of +-45° (ie at the max exactly on axis of one of the mics in the Blumlein setup) everything is fine. |
But summing to mono, gives one single forward facing fig 8, no phase problems there.
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Problems can, however, arise when sound comes quite exactly from the side (+- 90°; some singers in that circle setup, but also room reflections). Then it's picked up by the positive lobe of one mic and equally strong by the negative lobe of the other mic, thus eliminating when mono-ed.
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But this is out of bounds for a Blumlein pair anyway, so its not relevant. There should be no sources in those areas. Room sounds coming in on the side quadrants don't matter either as they are incoherant.