Highpass Filter - AKG C 451B Mode D'emploi

audible distortion. To minimize the risk of getting
audible distortion, use the preattenuation switch
on the microphone shaft to switch in 10 dB (1:3)
or 20 dB (1:10) of preattenuation.
Low-frequency rumble
or wind noise such as
air conditioning rumble,
traffic noise, structure-
borne noise, etc. that
usually pass unnoticed
may become a clearly
audible nuisance on a
recording.
To minimize
frequency noise, you can switch in the highpass
filter. Depending on the spectra of the wanted
and unwanted signals, set the highpass filter
switch on the microphone shaft from flat (1) to a
corner frequency of 75 Hz (2) or 150 Hz (3). In
either position, the slope of the filter is
12 dB/octave (1:4) downward.
Clean the surface of the microphone body with
(methylated) spirits or alcohol.
1. Wash the windscreen in mild soap suds.
2. Allow the windscreen to dry.
You can use the windscreen again as soon as
it has dried completely.
–
—
˜
low-
3 Application
3.5 Highpass
Filter
Fig. 5: Highpass
filter switch.
Refer to fig. 5.
4 Cleaning
4.1 Body
Surface
4.2 Internal
Windscreen
17