SCHOEPS LC 120 - Handbuch (Seite 3)

SCHOEPS GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050
www.schoeps.de · [email protected]
3
English
Active Low-Cut Filters
LC 60 U (60Hz), LC 120 U (120Hz)
– for phantom-powered microphones, in par-
ticular CCM C OMPACT C ONDENSER
M
ICROPHONES
and CMC microphones of the
Colette modular system
– for standard phantom power, 12 V or 48 V
These electronic filters can be inserted any-
where in the microphone cable path. With a
rolloff of 18 dB/octave, the LC 60 U suppresses
low-frequency acous tic interference (e.g. wind
noise, or solid-borne infra sonic noise such as
handling noise during boom operation) with-
out detracting from the sound quality of voice
recordings. Under extreme conditions the
LC 120 U can be used, though it may have an
audible effect on the sound of a voice. Both
filters can help prevent overloading the input
circuit to which a micro phone is connected
– a problem which occurs more often than
many people realize.
The specifications of the SCHOEPS micro-
phones
(sensitivity, noise, source impedance) remain
nearly unchanged with the LC.
These low-cut filters are suitable not only for
SCHOEPS microphones but also for phantom-
powered microphones of other manufacturers,
provided that they have a current consumption
of at least 2 mA. Other wise the maximum
sound pressure level would be reduced.
Please note:
The use of two LC in series is possible, partic-
ularly with SCHOEPS microphones, but is not
recommended. When combining two identical
filters, the resulting slope would be 36 dB/oct.
The cutoff frequency would be raised, and
the maximum output level with 12-Volt oper-
ation would be lowered. In no case should
three LC be cascaded, especially if the micro-
phones have less than 4 mA current consump-
tion.
Frequency in Hz
Technical Specifications:
Filter: in-line low-cut, Butterworth,
18 dB/octave
Cut-off frequency (-3 dB):
LC 60 U: 60 Hz,
LC 120 U: 120 Hz
A maximum of two filters may be used in
series, which would then result in a
36 dB/octave slope.
Output impedance: 40 Ohms at 1 kHz with
SCHOEPS CCM compact microphones or
CMC microphones of the Colette modu-
lar system
Gain: 0 dB
Maximum output voltage: ca. 1 V when 4 mA
current is being drawn
Diameter: 20 mm
Length. 94 mm
Surface finish: nickel
Weight: 90g