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Old 8th August 2019
Lives for gear

Regardless of the plane of the Blumlein pair, the included angle is still 90 deg in that plane.
There will also be some pick-up “above” and “below” the plane but this will roll off quickly away from the plane as fig8’s have the highest directivity/side-rejection of any mic pattern.
This can be useful in reducing bleed from nearby sound sources. Also bleed from any sound sources ( and esp. those with primarily low frequencies) located in the anti-phase regions will also tend to be reduced.
(eg I was micing a choir in the chancel of a church with organ pipes on either side of the chancel in the ideal spot where I wanted to place my Soundfield mic to capture the choir. As expected the organ bleed was quite substantially reduced with a Blumlein decode vs xy cardiod decode. The organ and ambience were captured with other mics at the front of the Nave.

Last edited by Folkie; 8th August 2019 at 02:58 PM.. Reason: correct last word to “Nave”