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According to the datasheet [A], the microphone covers the voice
spectrum, and performs best between 600 and 5000 Hz, with a preference
for the higher frequecies.
Measuring just 9.7 x 9.7 x 5 mm and weighting less than one gram,
it was one of the smallest microphones of its time.
The image on the right shows the 7114, which has a soft optional
sound port that allows the microphone to be housed inside a concealment.
By extending the sound port with a hollow pipe or flexible tube,
it can also be used as a probe microphone, much like the CIA's larger
Type-B.
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The image below shows the Audium T-7114 in comparison with other microphones
of the era. The T-7114 is visible at the bottom right (with the two
yellow wires). At the bottom left is the
Shure MC-30.
At the front centre are the later
Knowles BA-1501
and BA-1502.
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Frequency 600 - 4000 Hz Impedance 2500Ω at 1000 Hz Size 9.7 x 9.7 x 5 mm Weight < 1 gram Material Metal Connection Solder pads
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© Crypto Museum. Created: Wednesday 05 April 2017. Last changed: Friday, 30 May 2025 - 09:40 CET.
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