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SCHOEPS

GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050

www.schoeps.de · [email protected]

Troubleshooting

22

English

Wind Noise and Windscreens

Air motion (wind, vocal “popping” on sung
or spoken consonants, motion of the micro-
phone on a boom arm, or air currents due to
heating or air conditioning systems) can cause
noise that should always be dealt with. Even if
it doesn't cause overload, it will detract from
the clarity of sound. A wind or pop screen
should be used, but should be chosen carefully
to avoid changing the microphone's charac-
teristics too much. Many screen types that are
effective at reducing wind noise also have a
tendency to reduce a microphone's direction-
ality and/or its high-frequency response. Basket-
type windscreens mainly cause some uneven-
ness in the frequency response, while foam
windscreens mainly tend to dampen high fre-
quencies.

Vibration

If noise from mechanical vibration is going to
reach a stand- or boom-mounted microphone,
a shock mount (elastic suspension) should be
used, and a loop of slack cable isolated and
tied off so that it does not become another way
for vibra tions to reach the microphone. Unlike
a windscreen, a shock mount will not affect
the characteristics of a microphone. In many
kinds of work it is well justified to use a shock
mount ”by default”.

Overload

If transient or continual overload occurs, or
seems likely to occur, it is useful to think of the
complete set of equipment used for a record-
ing or broadcast as a succession of ”stages”.
The signal should then be attenuated (its level
decreased) at the input to the first stage of
equipment that might be overloaded. Reducing
the gain at any earlier stage would add unnec-
essary noise, while reducing it at a later stage
would not solve the problem.

A condenser microphone itself represents at

least two stages – the capsule and the ampli fier.
The only sound pressure that could overload a

SCHOEPS

microphone capsule (150+ dB SPL)

would also damage human hearing almost
instantly; in practice our capsules are rarely
over loaded except by explosions or direct

Foam windscreen W 140 

(included accessory)

Fure-type windscreen “Softie”, 12 cm dia.

Basket-type windscreen WSR CMIT U with
Connbox included;
below: WSR CMIT U with WJ CMIT
Windjammer (must be ordered separately)

Windscreens for the CMIT 5 U:

Rycote “Softie Lyre Mount”
(40 cm long XLR-3 cable
included);
available as of June 2009

Содержание CMIT 5 U

Страница 1: ...Guide Table of Contents page Features accessories 15 Applications 17 Filters 18 Starting up 19 Phantom powering 20 Hints on avoiding interference 21 Troubleshooting 22 Care and maintenance 24 Technica...

Страница 2: ...lobe shaped polar pattern The CMIT 5 U stands out for its interference tube which takes effect at a relatively low frequency without the pickup pattern becoming too narrow at high fre quencies its exc...

Страница 3: ...ammer must be ordered sepa rately Further a microphone with a figure 8 direc tional pattern is needed the CCM 8Lg Connbox WSR MS CMIT LU basket type wind screen WSR DMS CMIT LU basket type windscreen...

Страница 4: ...ligibility The SCHOEPS CMIT 5 U offers a built in switchable high frequency boost of this kind 2 2 The polar patterns of shotgun micro phones often have multiple narrow lobes of sensitivity These can...

Страница 5: ...noise The filter below 300 Hz 6 dB oct is a gentle roll off that compensates for proximity effects elevation of low frequencies by directional microphones in near field use They also pro tect against...

Страница 6: ...for example Filters cut out high frequencies picked up by the cable e g from mobile phones The microphone amplifier of the CMIT 5 U has a transformerless class AB output stage without condensers This...

Страница 7: ...tom power available but only an unbalanced input probably even unpowered If the latter is the case a standalone P48 supply with balanced in ouputs should be used before this input If the input has got...

Страница 8: ...interference such as monitors digital equipment computers RF emitters mobile phones and other per sonal communication devices that emit radio frequency energy power transformers power lines SCR dimmer...

Страница 9: ...does not become another way for vibrations to reach the microphone Unlike a windscreen a shock mount will not affect the characteristics of a microphone In many kinds of work it is well justified to...

Страница 10: ...too high and avoiding noise on the other sensitivity too low Ideally a mixer or preamp should not add any noise of its own to a microphone s signals but a dB or two of hiss is better than gross distor...

Страница 11: ...noises can result from the condensation of moisture In this event the microphone should be given between 30 and 60 minutes to warm up and will then generally perform flawlessly If this treatment does...

Страница 12: ...4 V phantom Current consumption 4 4 mA Maximum output voltage 1 3 V at 1 kHz 1 kOhms Output impedance 50 Ohms Recommended load impedance 600 Ohms or greater Dimensions Length 251 mm Diameter 21 mm Wei...

Страница 13: ...en the permitted tolerances this current should be between 5 9 and 8 5 mA DC for P48 Note Well designed phantom power supplies must tolerate at least a temporary short circuit without damage an unbala...

Страница 14: ...tomer in Germany or to our representative if you are a customer outside Germany Prior to sending your defective product for repair please contact your local dealer or dis tributor for instructions In...

Страница 15: ...n Not responsible for errors or omissions Subject to change without notice 131202 Technik Schall SCHOEPS GmbH Spitalstr 20 D 76227 Karlsruhe Durlach Germany Tel 49 0 721 943 20 0 Fax 49 0 721 943 2050...

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