Drizt
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I believe technically yours is not a helmholtz resonantor but a capped quarter-wave resonator. A beer bottle would be an example of a helmholtz resonator.
Quarter-wave resonators are simple to work out but have a narrow bandwidth. It is simply a matter of making a tube of the correct length to match the frequency you want to cancel out.
Helmholtz resonators are more complex but have a wider bandwidth. See here for the forumula -> Helmholtz resonance - Wikipedia, the free encyclopedia
Quarter-wave resonators are simple to work out but have a narrow bandwidth. It is simply a matter of making a tube of the correct length to match the frequency you want to cancel out.
Helmholtz resonators are more complex but have a wider bandwidth. See here for the forumula -> Helmholtz resonance - Wikipedia, the free encyclopedia