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User Guide
E2003, Shure Incorporated
27B3142 (CE)
Printed in U.S.A.
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SHURE INCORPORATED
KSM109 CARDIOID CONDENSER MICROPHONE
R
Thank you for selecting the KSM109
Over 75 years of audio experience has contributed to making the KSM109
one of the finest microphones available.
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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
4:30 pm, CST. In Europe, call 49-7131-72140. Our web address is www.shure.com.
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0/15 dB
Attenuation Switch
FIGURE 1. THE KSM109
GENERAL DESCRIPTION
The ShureR KSM109 is an end-address condenser microphone with a cardioid
polar pattern. Designed for studio use, yet rugged enough for live applications, the
KSM109 delivers a clear reproduction of the origninal sound source. Its extended
frequency response makes it ideal for recording musical instruments.
FEATURES
S Cardioid polar pattern to reduce the pickup of unwanted sounds
S Ultra-thin, 2.5 µm, 24 karat gold-layered, low mass Mylar
superior transient response
S Class A, discrete, transformerless preamplifier for transparency, extremely
fast transient response, no crossover distortion, and minimal harmonic and
intermodulation distortion
S Premium electronic components, including gold-plated internal and external
connectors
S Two-position switchable pad (0 dB and 15 dB) for handling extremely high
sound pressure levels (SPLs)
R
diaphragm for
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PERFORMANCE CHARACTERISTICS
S Extended frequency response
S Low self-noise
S Can withstand high sound pressure levels (SPLs)
S High output level
S No crossover distortion
S Uniform polar response
S Superior common mode rejection and suppression of RFI (radio frequency
interference)
APPLICATIONS
The KSM109 will produce superior results in any application requiring a high quality
microphone. Typical applications include:
S Close miking of acoustic instruments such as piano, guitar, violins, drums,
and percussion
S Overhead miking of drums and percussion instruments
S Electric guitar amplifiers
S Brass and woodwind instruments
S Orchestras, choirs, and wind ensembles
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 room treatments .
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USING THE KSM109
Mounting the Microphone
To secure the KSM109 to a floor stand or boom, thread the mount onto the
microphone stand and insert the microphone into the mount.
Power Requirements
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The KSM109 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 Ω. When used with modern
microphone preamplifiers rated at about 2500 Ω, the KSM109 provides higher
maximum SPL capability and output clipping level. When the attenuation switch is
set to the –15 dB position, the KSM109 can handle up to 165 dB SPL, and can
output +15 dBV into a load of 5000 Ω or greater.
Setting Attenuation
The attenuation switch on the KSM109 lets you reduce the signal level by up to 15
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 approximately
0.75 meters (2 feet) from sound sources such as a snare drum, or electric guitar
cabinet.
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SPECIFICATIONS
Cartridge Type Permanently Biased Condenser
Frequency Response 20–20,000 Hz (see Figure 2)
Directional Polar Pattern Cardioid (see Figure 3)
Output Impedance 150 Ω (actual)
Attenuation Switch 0 dB or 15 dB attenuation
Phantom Power 48 Vdc± 4 Vdc (IEC–268–15/DIN 45 596),
Current Drain 5.2 mA typical at 48 Vdc
Common Mode Rejection ≥ 50 dB, 20 Hz to 20 kHz
Polarity Positive pressure on diaphragm produces positive
Dimensions and Weight 24 mm (0.950 in.) diameter, 162 mm (6.375 in.) long;
Sensitivity (typical, at 1000 Hz;
1 Pa = 94 dB SPL)
Self–noise (typical, equivalent SPL;
A-weighted (IEC 651))
Maximum SPL@ 1000 Hz
5000 load (Attenuator on)
2500 load (Attenuator on)
1000 load (Attenuator on)
Output Clipping Level*
5000 load
2500 load
1000 load
Dynamic Range
(Attenuator on)
5000 load
2500 load
1000 load
Signal to Noise Ratio** 75 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 the difference between 94 dB SPL and equivalent SPL of self-noise A-weighted.
positive pins 2 and 3
voltage on output pin 2 relative to pin 3
195 grams (6.9 oz.) (see Figure 4)
–41 dBV/Pa
19 dB
150 (165) dB
144 (159) dB
139 (154) dB
15 dBV
9 dBV
3 dBV
133 (136) dB
128 (130) dB
122 (125) dB
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FIGURE 2. TYPICAL FREQUENCY RESPONSE
FIGURE 3. TYPICAL POLAR PATTERNS
24 mm
(0.950 IN)
162 mm
(6.375 IN)
FIGURE 4. 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 KSM109 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
Vinyl Pouch A109ZB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windscreen A3WS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microphone Clip A25D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPTIONAL ACCESSORIES
SHOCKSTOPPERt Shock Mount A55M, A55HM. . . . . . . . . . . . . . . . . . . . . .
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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