Shure Headphones KSM141 User Manual

User Guide  
E
2003, Shure Incorporated  
Printed in U.S.A.  
27B3156 (CE)  
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SHURE INCORPORATED  
KSM141 DUAL POLAR PATTERN CONDENSER MICROPHONE  
R
Thank you for selecting the KSM141  
Over 75 years of audio experience has contributed to making the KSM141  
one of the finest microphones available.  
If you have any questions not answered in this booklet, please contact Shure  
Applications Engineering at 847-866-2525, Monday through Friday, from 8:00 am to  
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Rotating  
Polar Pattern Switch  
0/15/25 dB  
Attenuation Switch  
Low Frequency  
Response Switch  
FIGURE 1. KSM141  
GENERALRDESCRIPTION  
The Shure  
KSM141 is an end-addressed condenser microphone with  
mechanically switching dual polar patterns (cardioid and omnidirectional).  
Designed for studio use, yet rugged enough for live applications, the KSM141 can  
withstand extremely high sound pressure levels (SPL). Its low self-noise and  
extended frequency response make it ideal for recording musical instruments.  
FEATURES  
SA mechanical polar pattern switch for highly consistent cardioid and true  
omnidirectional polar patterns. Provides flexibility in a wide variety of recording  
applications.  
R
SUltra-thin, 2.5 µm, 24 karat gold-layered, low mass Mylar diaphragm for  
superior transient response  
SClass A, discrete, transformerless preamplifier for transparency, extremely  
fast transient response, no crossover distortion, and minimal harmonic and  
intermodulation distortion  
SPremium electronic components, including gold-plated internal and external  
connectors  
SSubsonic filter eliminates low frequency rumble (less than 17 Hz) caused by  
mechanical vibration  
SThree-position switchable pad (0 dB, 15 dB, and 25 dB) for handling  
extremely high sound pressure levels (SPLs)  
SThree-position switchable low-frequency filter to reduce background noise  
and counteract proximity effect  
2
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PERFORMANCE CHARACTERISTICS  
SExtended frequency response  
SLow self-noise  
SExceptional reproduction of low-frequency sounds  
SCan withstand high sound pressure levels (SPL)  
SHigh output level  
SNo crossover distortion  
SUniform polar response  
SSuperior common mode rejection and suppression of RFI (radio frequency  
interference)  
MODEL VARIATIONS  
KSM141/SL  
KSM141/SL ST PAIR  
One KSM141 Condenser Microphone Two KSM141 Condenser Microphones  
One A141C Carrying Case  
One A100WS Windscreen  
One A57F Stand Mount  
One A141SPC Carrying Case  
Two A100WS Windscreens  
Two A57F Stand Mounts  
One European-threaded adapter that  
Two European-threaded adapters that  
mates the A57F to European-threaded mate the A57F to European-threaded  
microphone stands  
microphone stands  
APPLICATIONS  
The KSM141 produces superior results in any application requiring a high quality  
microphone. Typical applications include:  
SClose miking of acoustic instruments such as piano, guitar, violins, drums,  
and percussion  
SOverhead miking of drums and percussion instruments  
SElectric guitar amplifiers  
SBrass and woodwind instruments  
SRoom ambience pick-up (guitar amplifier or drums)  
SOrchestras, choirs, wind ensembles  
SLow-frequency instruments such as double bass and kick drum  
NOTE: Sound quality is strongly affected by microphone location and room  
acoustics. To achieve the best overall sound for a particular application, it may be  
necessary to experiment with microphone placement and various room treatments.  
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USING THE KSM141  
Mounting the Microphone  
To secure the KSM141 to a floor stand or boom, thread the mount onto the  
microphone stand and insert the microphone into the microphone clip.  
Power Requirements  
This microphone requires phantom power and performs best with a 48 Vdc supply  
(IEC-268-15/DIN 45 596). It can operate on voltages as low as 11 Vdc, but headroom  
and sensitivity will be decreased slightly.  
NOTE: Most modern mixers provide phantom power.  
Cable Connections  
Use a cable with XLR connectors at each end.  
Load Impedance  
Shure recommends a load impedance of at least 1000 . When used with modern  
microphone preamplifiers rated at about 2500 , the KSM141 provides higher  
maximum SPL capability and output clipping level. When the attenuation switch is  
set to the –25 dB position, it can handle up to 164 dB SPL, and can output +15 dBV  
into a load of 5000 or greater.  
Selecting a Polar Pattern  
To select either the cardioid or omnidirectional polar pattern, rotate the knurled ring  
on the microphone in either direction until you feel a detent. The image of the  
desired polar pattern should be directly above the notch at the base of the ring.  
NOTE: Operating the KSM141 in a non-detent position (no polar pattern selected)  
will produce an unpredictable polar pattern and may adversely affect frequency  
response.  
Cardioid. When this pattern is selected, the microphone picks up sounds  
directly in front of the microphone and is least sensitive to those in back. This is the  
most commonly used pattern in studio recording and live-sound applications. See  
Figure 4.  
Omnidirectional. Picks up sounds from all directions. This pattern is best for  
picking up room ambience and for miking several sources, such as an ensemble  
or multiple singers, simultaneously. The omnidirectional polar pattern exhibits no  
proximity effect. See Figure 4.  
WARNING: Rotating the polar pattern switch produces mechanical noise which,  
when amplified, may damage the loudspeakers. Turn down any loudspeakers or  
mute the microphone at the mixing console before changing the polar pattern.  
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Setting Low-Frequency Response  
A three-position switch on the microphone lets you adjust low frequency response.  
The low frequency filters can be used to reduce wind noise, room noise, and  
proximity effect. Refer to Figure 2.  
+5  
Flat response. This setting provides  
0
the most natural sound reproduction  
in most applicatons.  
–10  
Low-frequency cutoff. This setting  
provides an 18 dB-per-octave cutoff  
at 80 Hz. It helps eliminate floor  
2
3
4 5 6 789  
1000  
rumble and low-frequency noise  
produced by heating and air  
conditioning systems. This setting  
may also be used to compensate for  
proximity effect or to reduce low  
frequencies that make an instrument  
sound dull or muddy.  
20  
50  
100Hz  
Flat Response  
Low-Frequency Cutoff  
Low-Frequency Rolloff  
Figure 2. Low Frequency Responses  
Low-frequency rolloff. This setting provides a 6 dB-per-octave rolloff at 115 Hz.  
Use this setting to compensate for proximity effect or to reduce low frequencies  
that could make an instrument sound dull or muddy.  
Setting Attenuation  
The attenuation switch lets you reduce the signal level by up to 25 dB without  
altering frequency response. This can prevent extremely loud sounds from  
overloading the microphone. Set the switch to the desired attenuation levels as  
follows:  
0 dB – Move the switch to this position for “quiet” to “normal” sound levels.  
-15 dB – Move the switch to this position when the microphone is approxi-  
mately 0.75 meters (2 feet) from sound sources such as a kick drum, snare  
drum, or electric guitar cabinet.  
-25 dB – Move the switch to this position when the microphone is 4 inches  
(10 cm) or less from extremely loud sound sources such as kick drum, snare  
drum, or guitar cabinets.  
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SPECIFICATIONS  
Cartridge Type  
Permanently Biased Condenser  
20–20,000 Hz (see Figures 3 and 5)  
Cardioid/Omnidirectional (see Figures 4 and 6)  
150 (actual)  
Frequency Response  
Directional Polar Pattern  
Output Impedance  
Attenuation Switch  
0 dB,15 dB, or 25 dB attenuation  
Low Frequency Response Switch  
Flat; –6 db/octave below 115 Hz;  
–18 dB/octave below 80 Hz  
Phantom Power  
48 Vdc± 4 Vdc (IEC–268–15/DIN 45 596), positive  
pins 2 and 3  
Current Drain  
Common Mode Rejection  
Polarity  
4.65 mA typical at 48 Vdc  
50 dB, 20 Hz to 20 kHz  
Positive pressure on diaphragm produces positive  
voltage on output pin 2 relative to pin 3  
Dimensions and Weight  
20 mm (0.8 in.) diameter, 146 mm (5.75 in.) long;  
156 grams (5.5 oz.) (see Figure 7)  
Sensitivity (typical, at 1000 Hz;  
1 Pa = 94 dB SPL)  
–37 dBV/Pa  
14 dB  
Self–noise (typical, equivalent SPL;  
A-weighted, IEC 651)  
Maximum SPL  
5000  
2500  
1000  
W
load (Attenuator on)  
145 (160, 170) dB  
139 (154, 164) dB  
134 (149, 159) dB  
W
load (Attenuator on)  
W
load (Attenuator on)  
Output Clipping Level*  
5000  
2500  
1000  
W
load  
load  
load  
15 dBV  
9 dBV  
3 dBV  
W
W
Dynamic Range  
5000  
2500  
1000  
W
load  
load  
load  
131 dB  
125 dB  
120 dB  
W
W
Signal to Noise Ratio**  
80 dB  
*20 Hz to 20 kHz; THD < 1%. THD of the microphone preamplifier when applied input signal is equivalent to the cartridge  
output at specified SPL.  
**S/N ratio is difference between 94 dB SPL and equivalent SPL of self-noise A-weighted.  
6
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CARDIOID RESPONSE GRAPHS  
60 cm  
FIGURE 3. TYPICAL CARDIOID FREQUENCY RESPONSE  
2500 Hz  
6400 Hz  
10000 Hz  
250 Hz  
500 Hz  
1000 Hz  
FIGURE 4. TYPICAL CARDIOID POLAR PATTERNS  
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7
OMNIDIRECTIONAL RESPONSE GRAPHS  
60 cm  
FIGURE 5. TYPICAL OMNIDIRECTIONAL FREQUENCY RESPONSE  
250  
2500  
500  
6400  
1K  
10K  
FIGURE 6. TYPICAL OMNIDIRECTIONAL POLAR PATTERNS  
20 mm  
(0.8 IN)  
146 mm  
(5.75 IN)  
FIGURE 7. DIMENSIONS  
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CERTIFICATION  
Eligible to bear CE Marking; Conforms to European EMC directive 89/336/EEC.  
Meets applicable tests and performance criteria found in European Professional  
Audio Products EMC Standard EN 55103 (1996); Part 1 (Emissions) and Part 2  
(Immunity). The KSM141 is intended for use in environments E1 (residential) and  
E2 (Light Industrial) as defined in European standard EN 55103. EMC conformance  
is based on the use of shielded interconnecting cable.  
FURNISHED ACCESSORIES  
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A141C  
Case (Stereo Pair) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A141SPC  
Windscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A100WS  
Microphone Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A57F  
OPTIONAL ACCESSORIES  
SHOCKSTOPPERt  
Shock Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A53M  
SERVICE  
For additional microphone service or parts information, please contact the Shure  
Service Department at 1-800-516-2525. Outside the United States, please contact  
your Authorized Shure Service Center.  
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Trademark Notices: The circular S logo, the stylized Shure logo, and the word  
“Shure” are registered trademarks of Shure Incorporated in the United States.  
“SHOCKSTOPPER” is a trademark of Shure Incorporated in the United States.  
“Mylar” is a registered trademark of E.I. duPont de Nemours and Company in the  
United States. These marks may be registered in other jurisdictions.  
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