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Topic: get better frequency response from an electret mic? (Read 1 time) previous topic - next topic

MarkT

By electret do you mean an actual microphone or an electret mic insert?  The latter won't have much bass response without the right acoustic housing.
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winner10920

Just an element, what kind of housing do u mean?

MarkT

An actual microphone body - this is where the cleverness resides, not just the transducer - like an ear the microphone collects and focuses sound onto the transducer, has a frequency response and has a directional sensitivity.  I think this is quite a specialised area of acoustics (good microphones are extremely expensive, which is a hint).

In theory an electret is supposed to just respond to the air pressure in front of the diaphram (and the thin diaphram makes its mass less important than that of the air), but in practice sound waves are refracted and deflected by the housing and resonate at frequencies determined by the geometry of the sensor.  Also the same sound pressure tends (at low frequencies) to move the whole microphone, not just the diaphram - this is why good microphones are heavy, extra mass is added to prevent this.
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