Blumlein

At first glance, the Blumlein technique looks a little bit like XY - that is, two mics as close together as possible angled off center by 45 degrees each for a total angle of 90 degrees. And if the mics were cardioid (uni-directional) that would be true. However, Blumlein requires that the pattern of the mic be figure 8. This technique is characterized by sharp imaging and spacious ambience. In the right spot, this technique can sound great all by itself. But the right spot can be hard to find. Another consideration with Blumlein is the size (angle) of the ensemble being recorded. Everything generating "performance sound" should fall between the relatively narrow 90 degree angle of the forward-facing pickup pattern. If a source were to be far off to one side of the stage it might have phase problems because the rear-facing pickup pattern of a Blumlein pair is in opposite phase from the forward-facing pattern. Additionally, if Blumlein is too close, left and right sources may sound TOO hardly panned. If Blumlein is too far away, they will seem more centered, but there could be too much ambience.

Blumlein can sound great a few feet out from piano (or any reasonably stationary instrument/small enselble) when getting extra ambience is desirable. Can work for larger ensembles if ensemble does not exceed the 90 degree angle of the front quadrant of the stereo pair.

Accent mics may be used.