DPA 4003 User Manual page 6

User's Manual
Technical Description
Acoustic Pressure Equalizers
Available as optional acoustical attachments are also the APE's – Acoustic
Pressure Equalizers. The APE's use diffraction to passively modify the sound
field near the microphone diaphragm, thus changing the microphone's
frequency response and, in particular, the polar response (see Fig. 11 and Fig.
12) without adding any electrical noise to the recording. The size and shape
of the APE determines the acoustical changes of the microphone. The APE's
are precision made from a special compact nylon material and will only fit
the Types 4003 and 4006 fitted with the standard Nearfield Grid DD0251.
There are four different APE's in the range: L30B is a Ø30mm ball-shaped
APE marked with a blue dot, L40B is a Ø40mm ball-shaped APE marked with
a green dot, L50B is a Ø50 mm ball-shaped APE marked with a red dot and
the L110C is a cylinder-shaped APE, 110mm long and marked with a yellow
dot. The APE's can be obtained as single units or in two different equalizer
kits: APE L4 contains 4 different APE's and APE L8 contains 2x4 different
APE's. See Fig. 14 for how to mount the APE's on the microphones.
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 13dB and it is possible to
drive up to 100m 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 standard 3-pin male XLR-connector for
connection to standard cables.
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