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TECHNICAL DESCRIPTION

The cartridge

Omnidirectional (pressure) microphones DPA 4004 and 4007 use a

12 mm (0.47 in) diameter prepolarised 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 self noise

of the cartridge is typical 24 dB(A) re 20 μPa and the nominal sensi-

tivity of 4004 and 4007 are 10 mV/Pa and 2.5 mV/Pa respectively.

Due to the size of the cartridge it can handle extremely high SPLs,

has an extended linear frequency response up to 40 kHz and a high

degree of omnidirectionality, even for higher frequencies. For opti-

mum stability the microphone cartridge has undergone a special

pre-aging process which releases all tensions in the materials and

stabilizes the polarisation voltage.

The preamplifiers

Types 4004 and 4007 are acoustically identical, but differ in their

preamplifier powering system. The 4004 is powered with 130 V via

the HMA5000 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 10 dB higher SPL than similar microphone types po-

wered through conventional P48 systems (4004: 168 dB SPL peak

and 4007: 155 dB SPL peak).

Furthermore, the 4004 together with the HMA5000 is a totally

tranformerless system and therefore has an extended low-frequen-

cy handling capability (10 Hz to 40 kHz ± 2 dB). The 4007 is po-

wered via a standard P48 system and is equipped with a high quali-

ty audio transformer and a standard 3-pin XLR-connector (see Fig.

2 for pin designation). Types 4004 and 4007 use state of the art

low-noise preamplifier technology and are driven with unity gain.

All microphones come with an individual calibration chart with the

specifications of self noise, sensitivity and the frequency response.

Ground

Fig. 1. External view of the output connector of the DPA 4004.

Ground

Signal -

Fig. 2. External view of the output connector of the DPA 4007.

Important:

The microphone will only operate within it's specifications if

powered correctly.

Signal

130 V DC

Preamplifier Supply

Signal +