DPA 4003 Manual do utilizador - Página 3

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User's Manual

Technical Description

The cartridge

Types 4003 and 4006 are omnidirectional (pressure) microphones which 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: 45mV/Pa and 4006: 10mV/Pa). For optimum stability

the microphone cartridges have undergone a special pre-aging process which

releases all tensions in the materials and stabilizes the polarization voltage.

The preamplifier

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 modified 4-pin XLR-connector (see

Fig. 1 for pin designation). This special powering system enables the micro-

phone preamplifier to handle approximately 10dB higher SPL than similar

microphone types powered 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-frequency handling capability (10Hz to 20kHz ± 2dB). The 4006 is powered

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 possible.