4
TeChnICal DesCrIPTIOn
The cartridge
DPA 400 and 4006 are omnidirectional (pressure) microphones that use a 16
mm diameter prepolarized condenser cartridge. The cartridge has low self noise
(typical 15 dB(A) re. 0
µ
Pa) and high sensitivity (400 and 4006-TL: 40 mV/Pa
and 4006: 10 mV/Pa). For optimum stability the microphone cartridges have
undergone a special pre-aging process which stabilizes all tensions in the materi-
als as well as the polarization voltage.
The preamplifiers
DPA 400, 4006 and 4006-TL are acoustically identical, but differ in their pre-
amplifier powering system. The 400 is powered with 10 V via the HMA5000
High-Voltage Microphone Amplifier and has a modified 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 powered through conventional P48 systems (400: 154 dB SPL peak and
4006: 14 dB SPL peak). Furthermore, the 400 together with the HMA5000
is a totally transformerless system and therefore has an extended low-frequency
handling capability (10 Hz to 0 kHz ± dB). The 4006 is powered via a stan-
dard P48 system and is equipped with a standard -pin XLR-connector (see Fig.
for pin designation). DPA 400 and 4006 use state of the art low-noise pre-
amplifier technology. The preamplifiers are driven with unity gain to keep noise
as low as possible.
The 4006-TL is equipped with a state-of-the-art transformerless preamaplifier.
All components in this construction are very carefully selected to fulfil the demand
for optimal neutral timbre, tight and focused imaging and extremely low distor-
tion even at very high sound pressure levels. The transformerless design has an
extended low frequency handling capability (10 Hz to 0 kHz ± dB).
The 4006-TL is powered via a standard 48 V Phantom Power supply and has
a standard -pin XLR connector. See Fig. for pin designation. The output is
impedance balanced between pin and pin , with pin carrying the signal.
An attenuator is applied in the output amplifier to prevent overloading of input
sections in the following equipment such as mixing consoles etc. When the button
is pushed in, the output is attenuated by 0 dB.
All microphones come with an individual calibration chart of the selfnoise, sensiti-
vity and individual frequency response.
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