In the current issue of MAKE, Vol 30, we have an easy project by William Gurstelle for building a “sound sucker” using a mug, Jello, and hollow stirring straws. The instructions for making it are shown here (click thumbnail image below).
In the article William says:
The sound sucker works on a narrow range of frequencies. My testing showed it most effective a few cycles to either side of 660Hz (depending on the amount of gelatin), and the effect is most noticeable in a room with a wide spectrum of ambient noise frequencies.
We don’t know how the sound sucker works. Can you explain this acoustic phenomenon? If you can, post your explanation here.
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