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Thread: Ribbon Mic Frequency Response

  1. #11
    Tommy Yonley is offline Gold Club Member (1000+ posts)
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    I have another data point on the frequency response. Look at the data sheet for the coles 4038: http://www.wesdooley.com/pdf/4038C.pdf

    The frequency response is flat to 10kHz then drops steadily to (what looks like) beyond 40 kHz. There is no "null". To me, this suggests that in this case 1.) something other than the ribbon its self is limiting the high end frequency response and 2.) the frequency response limit of the ribbon its self in this case must be very high.

    - Tommy

  2. #12
    Wireline's Avatar
    Wireline is offline 3D VIP 2004, '05, '06, '08, '09, '10
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    I like it just fine...as long as I keep in mind its limitations...

    For my needs, works GREAT on vintage horns, some violas and cellos, and as a great voiceover mic...often as a lead vox mic for male baritones and/or female altos....kinda cool on acoustics (although I am drifting away from this usage)

    used it as an drum overhead on dozens of occassions as well...

    Kinda stinks on lead guitars (to me)...

    As far as 'cheap'...where are you finding them? I've half way looked for another, and can't seem to locate any.
    Ken Morgan
    2010 3d VIP

  3. #13
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    Originally posted by Tommy Yonley:

    However, read the following:

    "More typical designs would have a -3dB point between 10kHz and 20kHz. This is achieved by making the path-difference from the front of the ribbon to the back of the ribbon as small as practical."

    So if all we are talking about is the ribbon, why wouldn't they just say "to get the best high frequency response, make the ribbon as small as possible". Why do they talk about the "path difference"?


    - Tommy[/QB]
    You also have to take into account the ribbon motor in this path (the hunk of metal that the magnets are typically attatched to. This will make the path from front to back longer than just the ribbon. This was especially the case in some older ribbon mic designs, as the performance of magnets was not as good.

    If you leave more gap between the ribbon and the magnets, your performance drops significantly.

    Regards

    ju

  4. #14
    Tommy Yonley is offline Gold Club Member (1000+ posts)
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    According to http://www.k-bay106.com/market.htm

    As far as I can tell, they are pretty much the cheapest RCA ribbon you can get.

    - Tommy

  5. #15
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    Default

    Quote Originally Posted by 3daudioinc View Post
    That's not how I read it.

    Look closely at this:

    Then the pressure wave arriving at the back of the microphone is 360 degrees out of phase....

    So the limitation in upper frequency is the thickness (thin-ness) of the ribbon.
    How did I not notice this before? 360 degrees out-of-phase? Wouldn't that put it back IN phase?
    Lynn Fuston
    3D Audio

    Making beautiful music SEEM easy since 1979.

  6. #16
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    Quote Originally Posted by 3daudioinc View Post
    How did I not notice this before? 360 degrees out-of-phase? Wouldn't that put it back IN phase?

    No it wouldn't. But you know that. ;-)
    Andreas Lassak
    SoundDesign Studio

    It's maddening: As soon as I make it right - it suddenly works!

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