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Originally Posted by David Spearritt Blumlein is also completely fine summed to mono, there are no phase issues. When summing to mono, phase issues arise from left/right phase anomolies not front back. |
I should have been more precise. I remember reading a discussion (don't know if it was here or on the Neumann forum) in which someone had set up a vocal group in a circle around a Blumlein pair. The gist of that discussion was:
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. 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.