Omnidirectional mic - small hole in the capsule?

FAQ #2609 Updated October 23, 2008

Question:

I am studying Media Technology, microphones are the topic at present, was wondering if you could help me with a question? What is the purpose of the equalizing hole in the capsule of an omnidirectional mic?

Answer:

It is called a barometric leak. It equalizes the air pressure on both sides of the diaphragm. It serves the same function as the Eustachian tubes in the human ear.

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