DPA 4006 Podręcznik użytkownika - Strona 4
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The Free-field Grid, Silver
The Free-field Grid DD0251 on the microphone cartridge is designed
to have a linear on-axis frequency response for free-field applications
(see Fig. 4 for frequency responses measured with the Free-field Grid).
The grid is factory mounted but can be exchanged with the DD0297
Diffuse-field Grid or the UA0777 Nose Cone. Please be extremely
careful not to touch the exposed diaphragm when changing the grids.
The Diffuse-field Grid, Black
The Diffuse-field Grid DD0297 is supplied as standard. It is designed
for diffuse-field recordings, or recordings in the far field. The grid gives
a high-frequency boost on-axis of 6 dB around 15 kHz (see Fig. 5) with-
out adding noise to the recording. This boost gives a linear diffuse-field
(far field) response up to 15 kHz.
The Close-miking Grid (Silver, Trapezoid)
The Close-miking Grid DD0254 is available as an optional accessory.
Due to its high frequency roll-off (beginning at 12 kHz and -3 dB at 20
kHz) it is designed to provide a soft and smooth high-end response,
especially suitable for close miking applications. The response is altered
acoustically without adding any noise or distortion. See Fig. 6 for
frequency response.
The Nose Cone
The Nose Cone UA0777 is available as an optional accessory. As with
the Diffuse-field Grid DD0297, the Nose Cone is simply screwed onto
the microphone cartridge in place of the Free-field Grid DD0251.
When fitted, the Nose Cone gives the microphone a true omnidirec-
tional response even at high frequencies (see Fig. 11) and a linear dif-
fuse-field response (see Fig. 7). These qualities are useful at any dis-
tance for an even tonal balance of sound arriving at all angles of inci-
dence, 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 micro-
phone, which is the reason for normal flat fronted omnidirectional
microphones becoming more and more directional for higher frequen-
cies. There is, however, a slight high frequency boost on axis.
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Acoustic Pressure Equalisers
Available as optional acoustical attachments are also the APEs –
Acoustic Pressure Equalisers. The APEs use diffraction to passively
modify the sound field near the microphone diaphragm, thus changing
the microphone's frequency response and polar response (see Fig. 14
and Fig. 15) without adding any electrical noise to the recording. The
size of the APE determines the acoustical changes of the micro-
phone. The APEs are precision made from a special compact nylon
material and will only fit the Types 4003 and 4006 fitted with the
standard Free-field Grid DD0251. There are three different APEs in
the range: L30B is a Ø 30 mm ball-shaped APE marked with a blue
dot, L40B is a Ø 40 mm ball-shaped APE marked with a green dot,
L50B is a Ø 50 mm ball-shaped APE marked with a red dot. The APEs
can be obtained separately or in the APE L6 Acoustic Modification kit.
See Fig. 17 for how to mount the APEs on the microphone.
The Passive Connection Converter
The PCC4000 Passive Connection Converter is an optional accessory
that makes it possible to run High-Voltage Microphones on standard
48 V phantom power with reduced microphone specs. The maximum
reduction of the microphone SPL handling capability will be 13 dB and
it is possible to drive up to 100 m of cable with the PCC4000 with the
same specifications. Like the High-Voltage Microphones the PCC4000
is transformerless. The input connector is a modified 4-pin female
XLR for connection directly to the microphone. The output is a stan-
dard 3-pin male XLR-connector for connection to standard cables.
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