KSM109
User Guide
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0/15 dB
Attenuation Switch
FIGURE 1. THE KSM109
GENERAL DESCRIPTION
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The Shure 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
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Cardioid polar pattern to reduce the pickup of unwanted sounds
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Ultra-thin, 2.5 µm, 24 karat gold-layered, low mass Mylar diaphragm for
superior transient response
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Class A, discrete, transformerless preamplifier for transparency, extremely
fast transient response, no crossover distortion, and minimal harmonic and
intermodulation distortion
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Premium electronic components, including gold-plated internal and external
connectors
Two-position switchable pad (0 dB and 15 dB) for handling extremely high
sound pressure levels (SPLs)
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PERFORMANCE CHARACTERISTICS
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Extended frequency response
Low self-noise
Can withstand high sound pressure levels (SPLs)
High output level
No crossover distortion
Uniform polar response
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:
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Close miking of acoustic instruments such as piano, guitar, violins, drums,
and percussion
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Overhead miking of drums and percussion instruments
Electric guitar amplifiers
Brass and woodwind instruments
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
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
20–20,000 Hz (see Figure 2)
Cardioid (see Figure 3)
150 Ω (actual)
Frequency Response
Directional Polar Pattern
Output Impedance
Attenuation Switch
Phantom Power
0 dB or 15 dB attenuation
48 Vdc 4 Vdc (IEC–268–15/DIN 45 596),
positive pins 2 and 3
Current Drain
Common Mode Rejection
Polarity
5.2 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
24 mm (0.950 in.) diameter, 162 mm (6.375 in.) long;
195 grams (6.9 oz.) (see Figure 4)
Sensitivity (typical, at 1000 Hz;
1 Pa = 94 dB SPL)
–41 dBV/Pa
Self–noise (typical, equivalent SPL;
A-weighted (IEC 651))
19 dB
Maximum SPL*
(Attenuator on)
5000 W load
2500 W load
1000 W load
150 (165) dB
144 (159) dB
139 (154) dB
Output Clipping Level*
5000 W load
15 dBV
9 dBV
3 dBV
2500 W load
1000 W load
Dynamic Range
(Attenuator on)
133 (136) dB
128 (130) dB
122 (125) dB
5000 W load
2500 W load
1000 W 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.
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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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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.
E2002, Shure Incorporated
Printed in U.S.A.
27A3142 (BF)
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