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TECHNICAL DESCRIPTION
The cartridge
Types 4003 and 4006 are omnidirectional (pressure) microphones
that use a 16mm diameter prepolarized condenser cartridge. The
diaphragm is a nickel foil which has been coated with an ultra-thin
polymer layer for optimum corrosion resistance. The microphone
housing is of German silver, an alloy with a high content of nickel to
match the stable thermal qualities of the diaphragm. The cartridge
has low self noise (typical 15dB(A) re. 20µPa) and high sensitivity
(4003: 40mV/Pa and 4006: 10mV/Pa). For optimum stability the
microphone cartridges have undergone a special pre-aging process
which stabilizes all tensions in the materials as well as the polariza-
tion voltage.
The preamplifiers
Types 4003 and 4006 are acoustically identical, but differ in their
preamplifier powering system. The 4003 is powered with 130V via
the HMA4000 High-Voltage Microphone Amplifier and has a modi-
fied 4-pin XLR-connector (see Fig. 1 for pin designation). This special
powering system enables the microphone preamplifier to handle
approximately 10dB higher SPL than similar microphone types pow-
ered through conventional P48 systems (4003: 154dB SPL peak
and 4006: 143dB SPL peak).
Furthermore the 4003 together with the HMA4000 is a totally
transformerless system and therefore has an extended low-fre-
quency handling capability (10Hz to 20kHz ± 2dB). The 4006 is pow-
ered via a standard P48 system and is equipped with a standard 3-
pin XLR-connector (see Fig. 2 for pin designation). Types 4003 and
4006 use state of the art low-noise preamplifier technology. The
preamplifiers are driven with unity gain to keep noise as low as pos-
sible.
All microphones come with an individual calibration chart of the self
noise, sensitivity and the individual frequency response.
2
1
Ground
2
Fig. 1. External view of the output socket of the Type 4003.
Important:
The microphone will only operate within it' s specifications if
powered correctly.
Ground
1
Signal -
Fig. 2. External view of the output socket of the Type 4006.
4
Signal
3
130 V DC
Preamplifier Supply
2
Signal +
3
3
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