Blumlein setup

Discussion in 'Location Recording' started by Boneafide, Jun 8, 2005.

  1. Boneafide

    Boneafide Active Member

    In setting up a Blumelin array what happens if instead of placing the mics so that the front of both figure 8's are facing forward, the entire assembly is rotated 90° so that one figure 8 front and one figure 8 back is facing forward? Or if both rear lobes are facing forward 180°?

    Is there just a phase difference or something else happening? What's the best way to correct this besides not doing it?

    Regards,

    Joel
     
  2. David French

    David French Well-Known Member

    With the standard panning of a Blumlein pair, if you rotated the whole assembly 90°, you would end up with all of the ensemble in one speaker and mostly ambience in the other. If you happened to have recorded this way by accident, you could save yourself by treating the pair as MS with the one facing forward as the M and the one facing sideways as the S.
     
  3. Boneafide

    Boneafide Active Member

    If I rotated the array 45 degrees that would be similar to an MS configuration.

    If I rotated the array 90 degrees there would still be two mics turned 45 degrees left and right of center.
     
  4. David French

    David French Well-Known Member

    Whoops! For some reason, in my head, 90°=45°. Oh well. Anyway, to answer the real question, whatever the setup was aimed at would be out of polarity; it would sound very strange, like there was nothing in the center. Inverting the polarity on either mic would fix this.
     
  5. FifthCircle

    FifthCircle Well-Known Member

    If you do that, you will end up with an image that doesn't quite work and is looses half of its information when summed to mono.

    In short, don't do it... You can rotate it 180 degrees with success, but otherwise, that is the only way that it works well. If you rotate 45 degrees, you can make a good mid side setup..


    --Ben
     

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