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While I understand helmholtz resonators and the idea of wave canceling, every example that I can think of (specifically noise cancellation) is done in a controlled/defined volume. How does this apply or what would be the effectiveness of this in an unbounded/uncontrolled volume? I apologize if this is somewhat archaic but my knowledge of fluid dynamics is rusty.
I also wonder about the energy needed to not only perpetuate the required speed but also the volume needed to have any affect on low pressure void.
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