Shure KSM109 User manual

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User Guide
©2005, Shure Incorporated
27C3142 (Rev. 3) Printed in U.S.A.

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SHURE INCORPORATED
KSM109 CARDIOID CONDENSER MICROPHONE
If you have any questions not answered in this booklet, please contact Shure
Applications Engineering at 847-600-8440, Monday through Friday, from
8:00am to 4:30 pm, CST. In Europe, call 49-7131-72140. Our web address is
www.shure.com.
Over 75 years of audio experience has contributed to making the KSM109
one of the finest microphones available.
Thank you for selecting the KSM109.
®

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FIGURE 1. KSM109
GENERAL DESCRIPTION
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
• Cardioid polar pattern to reduce the pickup of unwanted sounds
• Ultra-thin, 2.5 µ m 24 karat gold-layered, low mass Mylar®diaphragm for
superior transient response
• Class A, discrete, transformerless preamplifier for transparency, extremely
fast transient response, no crossover distortion, and minimal harmonic and
intermodulation distortion
• Premium electronic components, including gold-plated internal and externall
connectors
• Two-position switchable pad (0 dB and 15 dB) for handling extremely high
sound pressure levels (SPLs)
0/-15 dB
Attenuation Switch

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PERFORMANCE CHARACTERISTICS
• 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:
• Close miking of acoustic instruments such as piano, guitar, violins, drums, and
percussion
• 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 Ωor 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
* 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.
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),
positive pins 2 and 3
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
voltage on output pin 2 relative to pin 3
Dimensions and Weight 24 mm (0.95 in.) diameter, 162 mm (6.37 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 Ωload
2500 Ωload
1000 Ωload
150 (165) dB
144 (159) dB
139 (154) dB
Output Clipping Level*
5000 Ωload
2500 Ωload
1000 Ωload
15 dBV
9 dBV
3 dBV
Dynamic Range
(Attenuator on)
5000 Ωload
2500 Ωload
1000 Ωload
133 (136) dB
128 (130) dB
122 (125) dB
Signal to Noise Ratio** 75 dB

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FIGURE 2. TYPICAL FREQUENCY RESPONSE
FIGURE 3. TYPICAL POLAR PATTERNS
FIGURE 4. DIMENSIONS
(0.950 IN)
162 mm
(6.375 IN)
24 mm

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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
SHOCKSTOPPER™ Shock Mount. . . . . . . . . . . . . . . . . . . . . .A55M, A55HM
Popper-Stopper™ Windscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS-6
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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SHURE Incorporated http://www.shure.com
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: [phone] U.S. Fax: [phone] Intl Fax: [phone]
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: [phone] Fax: [phone]
Asia, Pacific:
Shure Asia Limited, Phone: [phone] Fax: [phone]