DPA Microphone Type 4051, Type 4052, Type 4053, Type 3552 User's Manual
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CONTENTS
Technical Description 2
Specifications 8
3552: Compact omni kit, 48V. 11
Care of Microphone 13
Service and Repair 16
War ranty 16
CE Marking 16
USER’S MANUAL
Compact Omnidirectional Microphones Ø16 mm
Included in kit solutions
Type
4051
Type
4052
Type 4053
Type 3552
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TECHNICAL DESCRIPTION
The cartridge
Types 4051, 4052 and 4053 are Omnidirectional (pressure) microphones that use the same microphone capsule as the standard
microphones Types 4003 and 4006 - a 16 mm (0.63 in) 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
15 dB(A) re 20 mPa) and high sensitivity (30 mV/Pa). For optimum
stability the microphone cartridge has undergone a special preaging process which releases all tensions in the materials and stabilizes the polarization voltage.
The preamplifier
The Compact Omnidirectional Microphones use built-in ultra-small,
thickfilm preamplifiers with unity-gain, low noise FET-amplifier technology. The thick-film technology enables the microphone cartridge
to be mounted on an exceptionally compact microphone housing
with the preamplifier mounted directly behind the microphone cartridge. A circuit of passive components in the standard 3-pin XLR
connector adapts the P48 phantom powering, separates the supply
voltage from the audio signal and acts as an impedance balancing
circuit for optimum noise immunity. The preamplifier has a cable
drive capability of up to 100 m (3.94 in) after the XLR-connector
(See Fig. 1 for pin designation).
All microphones come with an individual calibration chart of the selfnoise, sensitivity and the individual frequency response.
Fig. 1. External view of the output socket of the standard 3-pin
XLR-connector used in the Types 4051, 4052 and 4053.
GroundSignal +
Signal -
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2
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Important: The microphones will only operate within their
specifications if powered correctly.
The mechanical design
Types 4051, 4052 and 4053 are acoustically identical, but differ in
their mechanical design. All Compact Omnidirectional Microphones
are delivered with 5 m (16.4 ft) of extremely flexible, high quality
microphone cable as standard. The 4051 cable is side-mounted on the
microphone and the 4052 cable is rear-mounted. The 4053 feature
a co-axial Lemo-connector, for simple and safe attachment mounting of the microphones to DPA Compact Active Poles.
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The Near-field Grid
The Near-field Grid DD0251 on the microphone cartridge is
designed to have a linear on-axis frequency response for near-field
applications (see Fig. 2 for frequency responses measured with the
Near-field Grid). The grid is factory mounted but can be exchanged
with the DD0297 Diffuse-f ield Grid or the UA0777 Nose Cone.
Please be extremely careful not to touch the exposed diaphragm
when changing the grids.
The Diffuse-field Grid
The Diffuse-field Grid DD0297 is supplied as st andard. It is
designed for diffuse-field recordings, or recordings in the far f ield.
The grid gives a high-frequency boost on-axis of 6 dB around 15 kHz
(see Fig. 3) without adding noise to the recording. This boost gives
a linear diffuse-field (far field) response up to 15 kHz.
The Nose Cone
The Nose Cone UA0777 is included in the 3552 kit and is available
as an optional accessory for 4051, 4052 and 4053. As with the
Diffuse-field Grid DD0297, the Nose Cone is simply screwed onto
the microphone cartridge in place of the Near-field Grid DD0251.
When fitted, the Nose Cone gives the microphone a true omnidirectional response even at high frequencies (see Fig. 6) and a linear diffuse-field response (see Fig. 4). These qualities are useful at any
distance for an even tonal balance of sound arriving at all angles of
incidence, e.g. room reverberation or several sound sources placed
around the microphone. The diaphragm is placed in a slot behind
the solid cone and sound waves only have access to the diaphragm
through the side of the Nose Cone. This way the Nose Cone prevents an on-axis, high frequency sound pressure build-up on the
microphone, which is the reason for normal flat fronted omnidirectional microphones becoming more and more directional for higher
frequencies. There is however, a slight high frequency boost on
axis.
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Fig. 2. On-axis and diffuse-field responses of Types 4051, 4052 and
4053 with the Near-field Grid DD0251 fitted.
Fig. 3. On-axis and diffuse-field responses of Types 4051, 4052 and
4053 with the Diffuse-f ield Grid DD0297 fitted.
25
dB
20
15
10
5
0
10 20 Hz 50 100 200 500 1 kHz 2 5 10 20 40D A B C Lin.
5 dB
Diffuse
Fig. 4. Diffuse-field response of Types 4051, 4052 and 4053 with
Nose Cones UA0777 fitted.
25
dB
20
15
10
5 dB
5
0
10 20 Hz 50 100 200 500 1 kHz 2 5 10 20 40 D A B C Lin.
Diffuse
On-axis
25
dB
20
15
10
5 dB
5
0
10 20 Hz 50 100 200 500 1 kHz 2 5 10 20 40 D A B C Lin.
On-axis
Diffuse
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