Manual

SCHOEPS GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: [phone] · Fax: [phone]
www.schoeps.de · [e-mail]
Technical Specifications, Electromagnetic Compatibility
Microphone Amplifiers
Amplifier type Powering Current Impedance Low-cut
consumption frequency (-3 dB)
CMC 6U / 6Uxt: 12 V phantom 8 mA 25 Ohms 20 Hz
48 V phantom 4 mA 35 Ohms 20 Hz
(automatic switchover)
CMC 5U: 48 V phantom 4 mA 35 Ohms 30 Hz
CMC 3U: 12 V phantom 11 mA 20 Ohms 30 Hz
Polarity: Increasing sound pressure on the microphone's 0° axis produces a positive-going voltage
at pin 2.
Maximum output voltage: 1 V (at 1 kHz and 1 kOhm load resistance)
Minimum recommended load resistance: 600 Ohms (A load resistance below this value will par-
ticularly reduce the maximum output level.)
The other technical specifications depend on the choice of capsule – see page 12 ff.
Length: 116 mm (incl. 3 mm capsule thread)
Diameter: 20 mm
Weight: 65 – 68 g, depending on type
Surface finish: matte gray (g) or nickel (ni)
1) Keep both the microphone and the cable
away from sources of interference such as
monitors, digital equipment (computers),
RF emitters (mobile phones), power trans-
formers, power lines, SCR dimmers, switch-
ing power supplies etc.
2) Use only high-quality cables with a high
degree of shield coverage.
3) Keep all cables as short as possible.
4) Dress audio cables away from power cables.
If they must cross, it should be at right angles.
5) At the preamp or mixer input, the shield of
the microphone cable should connect to
chassis ground in the shortest way possible.
If necessary, this coupling can be capacitive.
the cable can be. All SCHOEPS cables have
very low capacitance (100 pF/m between the
conductors).
The main risks with excessively long micro-
phone cables are losses at high frequencies
due to cable capacitance, reduced ability to
handle very high sound pressure levels, and
increased likelihood of picking up interference.
No tes on Electromagnetic Compatibility
SCHOEPS CMC microphone amplifiers are
virtually immune to magnetic, electric and
electromagnetic fields. This is particularly true
for CMC 6 amplifiers made since 2004; they
can be recognized by the gold-colored shield
plate in their output connector.
Due to the wide dynamic range of studio
microphones, the smallest signal amplitudes
are in the microvolt (1/1,000,000 Volt) range.
Cable shielding and the grounding scheme of
the preamp or mixer input are also crucial.
Thus no microphone can ever be immune to
all possible disturbances under all circumstances.
But the following suggestions can help to
reduce the likelihood of picking up noise:
7