SCHOEPS CUT 2 - Handbuch (Seite 3)

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Application Notes
3
Active Variable Low-Cut Filters
CUT 1, CUT 2
– can be screwed onto the CMC, CMD or
M 222 microphone amplifiers of the Colette
modular Series
– very effective suppression of low-frequency
and infrasonic effects of wind and vibration
– user-adjustable variable rolloff
– offsets proximity effect
The CUT 1 or CUT 2 is inserted between the
capsule and the microphone amplifier:
Place the CUT against the front end of the
microphone amplifier. Now turn it first counter-
clockwise (not pressing the parts together) until
you feel a gentle ”click”. You are then at the
beginning of the thread, and can attach the CUT
to the microphone amplifier with normal clock-
wise rotation.
Now proceed in the same way when screw-
ing the capsule onto the CUT.
The CUT filter performs two tasks:
First, it prevents the effect of infrasonic distur-
b ances from being passed on to any succeed-
ing device.
In par ticular, pressure-gradient transducers
(directional micro phones) produce very high in-
frasonic 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) infra-
sonic filter is permanently engaged. It has only
a negligible effect on speech, which is the prin-
cipal field of application for the CUT 1 (cutoff
frequency = 60 Hz). The CUT 2's infrasonic fil-
ter is an octave lower (i.e. 30 Hz), and has no
audible effect on speech pickup whatsoever.
MK CUT
Frequency response of the CUT 1 at various
settings of the control
Frequency response of the CUT 2 at various
settings of the control
The second task is to offset proximity effect
and / or to im prove speech intelligibility in re-
verberant rooms by means of an additional 6
dB/oct rolloff. By turning a re cessed thumb-
wheel 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, below).
Notes: It is expected 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.
For technical reasons the CUTs raise the sen-
sitivity of standard microphone amplifiers by 5
dB, while those marked with “+ 5 dB” will re-
tain 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, a stiffer elastic sus-
pension (A 20 S) is required.
Length: 64 mm, diameter: 20 / 21 mm
Weight: 50 g
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