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Acoustic Frequency Hole - How does this work?

  1. May 18, 2010 #1
    Acoustic "Frequency Hole" -- How does this work?

    Here is a project proposal that I read:

    I decided to give it a try and I made this project and it works.
    But I don't seem to understand why and how this works. Can someone explain this phenomenon?

  2. jcsd
  3. May 19, 2010 #2
    Re: Acoustic "Frequency Hole" -- How does this work?

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