Position Omni's for Boundary Effect?

Discussion in 'Pro Audio' started by Bob Singleton, Aug 10, 2004.

  1. Is it possible to position an omni mic like an Earthworks or Behringer
    or similar shape, with a standard mic stand, close enough to a wall or
    window to create boundary effect similar to a PZM? Is the gap between
    the surface and the element so critical that the idea is impractical,
    or could one simply put 10 sheets of paper (or something like that)
    between the surface and the mic, then remove it to create the
    appropriate gap?

    Spending way too much time thinking about microphones...

    Bob Singleton
    Singleton Productions, Inc.
    http://singletonproductions.com
     
    Bob Singleton, Aug 10, 2004
    #1
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  2. Bob Singleton

    JoVee Guest

    lay the mic on its side, on the surface

    if indeed you want to position the element looking AT the surface, the gap
    needs to corespond to a wavelength above audibility.
     
    JoVee, Aug 10, 2004
    #2
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  3. Bob Singleton

    Scott Dorsey Guest

    EV used to sell a foam thing called the "Microphone Mouse" for doing just
    that.
    The trick that Crown patented was that they used the gap distance to create
    a rising top octave which in turn compensated for the top octave falloff on
    the capsules they used. You can do something similar on an EV 635A with
    some gaffer tape and actually get some top end on the thing, but you will
    have to remove the windscreen to get the diaphragm close enough to the
    surface.
    --scott
     
    Scott Dorsey, Aug 10, 2004
    #3
  4. Bob Singleton

    Arny Krueger Guest

    The Berhinger ECM 8000 looks like a bad candidate, because the capsule is
    really a 1/4 capsule in a 1/2" casting, so there's a built-in 1/8" gap.

    OTOH, the PZM effect doesn't just go completely away if your spacing is too
    wide, or is the mic isn't an omni.

    For example, sometimes just placing a mic on the floor, or on a table in the
    right place will get you a really good recording.
     
    Arny Krueger, Aug 10, 2004
    #4
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