Chapter 6 — Pressure-field
1
/
2
" Microphone Type 4192
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
BE1378– 12
6
−
9
For applications where the vent is not exposed to the sound field, take care to
ensure proper static pressure equalization to prevent static displacement of the
diaphragm.
The microphone’s low-frequency response is common for all types of sound field.
The microphone’s lower limiting frequency (–3dB) is between 1 and 2Hz with the
vent exposed to the sound field. This is measured during production to ensure that
specifications are fulfilled.
6.3.5 Free-field Response
The microphone’s free-field correction curves are shown in Fig.6.6 and Fig.6.8.
These corrections are added to the microphone’s actuator response obtained using
Electrostatic Actuator UA0033 in order to determine the free-field response at any
angle of incidence. The typical free-field response at 0° incidence with and without
the protection grid are shown in Fig.6.7 and Fig.6.9.
Fig.6.6 Free-field correction curves for the microphone with Pro-
tection Grid DB3421
940798/1e
500 1k 10k 50kFrequency (Hz)
– 5
– 2.5
2.5
Correction (dB)
5
7.5
10
12.5
15
– 10
– 7.5
0
0°
30°
60°
Random
90°
180°
120°
150°
θ°
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