SCHOEPS MDZ 20 - Handbuch (Seite 3)

Connectors: XLR-3F / XLR-3M
Dimensions: length: 75 mm
max. diameter: 19 mm
Color: Nickel
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
In-Line Attenuators
MDZ 10, MDZ 20
– for phantom- or parallel-powered microphones
– ca. 10 dB / 20 dB constant attenuation
– avoids overloading sensitive inputs
– does not reduce the microphone's signal-
to-noise ratio
When a condenser microphone is connected
to a sensitive input circuit, overload can result.
The MDZ 10 and MDZ 20 in-line resistive pads
reduce the likelihood of such overload when
they are inserted between the end of the
microphone cable and the input of the mixer,
preamp or recorder.
Unlike built-in pad switches in microphones,
or attenuators that fit between the micro-
phone's capsule and amplifier (e.g. SCHOEPS
DZC 10), in-line resistive pads reduce micro-
phone noise to the same degree as they reduce
signals. Using them directly at the input also
offers the advantage of reducing any hum or
interference that may be picked up in the cable.
Using a resistive pad at the microphone end
of a cable is not recommended. This effectively
raises the impedance of the cable to 200 Ohms,
increasing its sensitivity to the pickup of inter-
ference. It also weakens the signal before it
passes through the cable – again making any
interference that much more likely to be audible.
Note: When an MDZ attenuator is used, the
minimum permissible load impedance for a
CMC microphone is reduced from 600 Ohms
to 200 Ohms. This fact is relevant mainly for
any transformer-equipped microphone inputs
that are designed to present a matching
impedance to their signal source – an arrange-
ment that is quite rare.
A more common problem with transformer-
equipped preamp inputs (especially if the trans-
former has a high voltage step-up ratio) is that
their high-frequency response may rise or fall
when the output impedance of a microphone
lies outside the 150-200 Ohm range. In that
case, using an MDZ in-line pad at the input of
the preamp can help to correct its frequency
response as well as helping to avoid overload.
Parallel-powered microphones:
Phantom-powered microphones:
Where to insert the MDZs?
Our recommendations:
e.g. mixer
without
microphone
powering
MDZ powering
e.g. mixer
without
microphone
powering
MDZ powering
e.g. mixer with
built-in micro-
phone powering
MDZ