Specifications

44
Other Accessories for the Modular System
COLETTE
modular
CUT 2g
Variable Low-Cut Filters
CUT 1, CUT 2
– can be screwed onto the CMC, CMD or M 222
microphone amplifiers
– very effective suppression of low-frequency and
infrasonic effects of wind and vibration: 24 dB/oct
below 60 Hz (CUT 1) or below 30 Hz (CUT 2)
– user-adjustable variable rolloff
– offsets proximity effect
The CUT 1 or CUT 2 is inserted between the capsule
and the microphone amplifier. The CUT filter performs
two tasks:
First, it prevents the effect of infrasonic disturb ances
from being passed on to any succeeding device.
In par ticular, pressure-gradient transducers (direc-
tional micro phones) produce very high infrasonic signal
levels when exposed to wind. These can saturate an
input trans former or an amplifier stage even before the
audible por tion of the disturbance becomes noticeable.
To avoid this, a very sharp (24 dB/oct) infrasonic filter
is permanently engaged. It has only a negligible effect
on speech, which is the principal field of application
for the CUT 1 (cutoff frequency = 60 Hz). The CUT 2's
infrasonic filter is an octave lower (i.e. 30 Hz), and has
no audible effect on speech pickup whatsoever.
The second task is to offset proximity effect and / or
to im prove speech intelligibility in reverberant rooms
by means of an additional 6 dB/oct rolloff. By turning
a re cessed thumbwheel the user can vary the frequency
at which this begins to have an effect, and thus tailor
the low-frequency response as required. Its turnover
frequency can be continuously varied between 30 Hz
(CUT 2) or 70 Hz (CUT 1) and 600 Hz (see response
curves, above right).
Of course it is to be ex pected that filters such as the
CUTs will affect the naturalness of the sound picked
up by the microphone. But in many cases the CUTs
(in combi na tion with the appropriate windscreen) are
the only means by which an acceptable recording can
be made at all.
The CUTs raise the sensitivity of standard microphone
amplifiers by 5 dB, while those marked with “+ 5 dB”
will retain their increased sensitivity.
As an aid to properly seating the windscreens W 20
and W 20 R1, the diameter of the CUTs have a slight
step near their front ends.
Since the weight of a micro phone increases with the
addition of a CUT, the stiffer elastic suspension A 20 S
is required.
Dimensions: length: 64 mm, diameter: 20 / 21 mm
Weight: 50 g
Surface finish: matte gray (g) or nickel (ni)
Frequency response of the CUT 1 at
various settings of the control
Frequency response of the CUT 2 at var-
ious settings of the control