acoustic Pressure equalizers
Available as optional acoustical attachments are also the APEs – Acoustic
Pressure Equalizers. The APEs 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. 14 and Fig. 15) without
adding any electrical noise to the recording. The size and shape of the APE
determines the acoustical changes of the microphone. The APEs are precision
made from a special compact nylon material and will only fit the DPA 400
and 4006/4006-TL fitted with the standard DD051 Free-field Grid. There are
four different APEs in the range: L0B is a Ø0 mm ball-shaped APE marked
with a blue dot, L40B is a Ø40 mm ball-shaped APE marked with a green dot,
L50B is a Ø50 mm ball-shaped APE marked with a red dot. The APEs can be
obtained seperately 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 1 dB and it is possible to drive up to 100 m
(8 ft) 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 out-
put is a standard -pin male XLR-connector for connection to standard cables.
7
Summary of Contents for 4003
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