Chapter 1 — Introduction
The Microphones
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
1
−
4
humid environments. Externally polarized microphones are more stable, also at
high temperatures. All can be used with Brüel&Kjær’s
1
/
2
" Microphone Preamplifi-
er Type 2669. The two prepolarized microphones (Types 4188 and 4189) can also be
used with Brüel&Kjær’s Preamplifier Type 2671.
Free-field Response or Pressure-field Response
The four free-field response microphones (Types 4188 to 4191) cover specific IEC
requirements and should be used in sound fields where reflections are negligible.
The two pressure-field response microphones (Types 4192 and 4193) should be used
for measurements in acoustic couplers. They also cover specific ANSI requirements
and can be used in diffuse sound fields.
As Replacements for Traditional Brüel&Kjær Microphones
Table 1.1 shows what traditional Brüel&Kjær microphones (type approval permit-
ting) can be replaced by microphones from the Falcon
Range.
Microphone Specifications
The design and construction of each microphone results in a reliable transducer of
high sensitivity and low temperature dependence. Most of the data given for the
microphones in this handbook are for open-circuit conditions, which means that the
microphone looks into an infinitely high impedance. Table 1.2 summarises the most
important specifications for the microphones in the Falcon
Range. In practice,
however, a microphone is used with a preamplifier which slightly influences the
given responses. When you use a Brüel&Kjær preamplifier (for example,
1
/
2
" Micro-
phone Preamplifier Type 2669), the input impedance is very high (high resistance,
low capacitance), and the loading on the microphone cartridge is insignificant.
Traditional Microphone Falcon
Range
4155 4189
4165 4190
4133/4149 4191
4134 4192
4147 4193
4166
4188
*
/4190
*
/4192
*
4176
4188
*
/4189
*
Table 1.1 Replacement of traditional Brüel&Kjær microphones
with ones from the Falcon™ Range
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