DPA 4017 User Manual page 6

Filters
DPA 401 7 features two switching filters which are controlled at the switching ring,
and a permanent third order high pass filter at 50 Hz (See fig. 3).
Switching filters
High boost: When the switching ring is turned on, the filter is on, giving +4 dB
at 8 kHz (shelving). It is recommended for any high frequency loss caused by use
of third party manufacturer's windshield. Use DPA WINDPAC® to avoid any high
frequency attenuation.
Bass roll-off: By turning the switching ring on, the filter is on, giving a first order
(6 dB/oct) bass roll off below 300 Hz. This decreases unwanted low frequency
disturbance from handling and wind noise. Furthermore, it can be used to tune
the desired amount of bass in a voice, as the bass response of the microphone
is influenced by the proximity effect. Short distances to a performer will usually
require the bass roll-off filter to be switched on to compensate for the low fre-
quency rise.
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