Shure Cardioid Condenser Microphone Ksm27 Users Manual

KSM27 to the manual 619f576b-0166-4e82-9a78-b830d3f4fb80

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User Guide

27B3138 (Rev. 2)

E2003, Shure Incorporated Printed in U.S.A.

1

SHURE INCORPORATED

KSM27 CARDIOID CONDENSER MICROPHONE

If you have any questions that are 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.

Thank you for selecting the KSM27

Over 75 years of audio experience has contributed to making the KSM27

one of the finest microphones available.

2

KSM27 BACKKSM27 FRONT

15 dB

attenuator

Low-frequency

response switch

FIGURE 1. KSM27 FRONT AND BACK

GENERAL DESCRIPTION

The ShureR KSM27 is a side-address condenser microphone with a cardioid polar

pattern. Designed for studio use but rugged enough for live applications, the KSM27

has an externally biased 1-inch diaphragm, extremely low self-noise, and an

extended frequency response specially tailored for vocal tracking and instrument

recording.

FEATURES

SCardioid polar pattern – the most commonly used pattern for both studio and

live applications

S1 inch, externally biased, ultra-thin, 2.5 µm, 24 Karat gold-layered, low

mass, MylarR diaphragm provides superior transient response

SClass A, discrete, transformerless preamplifier for transparency, extremely fast

transient response and no crossover distortion, while minimizing harmonic and

intermodulation distortions

SPremium electronic components and gold-plated internal and external

connectors

SSubsonic filter eliminates rumble from mechanical vibration below 17 Hz

SSwitchable 15 dB pad for handling extremely high sound pressure levels (SPLs)

S3-position switchable low-frequency filter helps reduce unwanted back-

ground noise or counteract proximity effect

SIntegrated three-stage “pop” protection grille reduces plosives and other

breath noise

SInternal shock mount reduces handling and stand noise

3

PERFORMANCE CHARACTERISTICS

SExtended frequency response

SLow self noise

SExceptional low-frequency reproduction

SHigh output level

SHigh input SPL capability

SNo crossover distortion

SExtremely uniform polar response

SSuperior common mode rejection and suppression of radio frequency

interference

APPLICATIONS

The KSM27 produces superior results in any application requiring a high quality

microphone. Typical applications include:

SVoice and vocals

SClose-miking of acoustic instruments such as piano, guitar, violins, drums,

and percussion

SElectric guitar amplifiers

SBrass and woodwind instruments

SLow-frequency instruments such as double bass and kick drum

SOverhead miking for drums or percussion

SOrchestras, choirs, wind ensembles

SRoom ambience pick-up (guitar amplifier or drums)

NOTE: Sound quality is strongly affected by microphone location and room

acoustics. To acheive the best overall sound for a particular application, it may be

necessary to experiment with microphone placement and various room treatments.

OPERATING THE KSM27

Mounting

Use the shock mount to secure the KSM27 to a floor or boom stand by threading the

shock mount onto the microphone stand and inserting/threading the microphone into

the shock mount.

Power

The KSM27 requires phantom power and performs optimally with a 48 Vdc supply

(IEC-268-15/DIN 45 596). However, it will operate with slightly decreased headroom

and sensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantom

power. Phantom power can only be transmitted to the KSM27 through a cable

terminated with XLR connectors at each end.

4

Positioning the Microphone

The front of the KSM27 is marked by the R logo. See Figure 1. Position this

side of the microphone toward the sound source to be recorded. The rear of the

microphone is marked by the logo, the low-frequency filter switch and the 15dB

attenuation switch.

Cardioid. Picks up sounds directly in front of the microphone and is least

sensitive to those in back. Cardioid is the most commonly used polar pattern in studio

recording and live-sound applications. See Figure 5.

Selecting Low-Frequency Response

A three-position switch on the back of the KSM27 lets you adjust the low-frequency

response of the microphone. The low-frequency filter settings can be used to reduce

wind noise, room noise or proximity effect. Since the microphone will reproduce

ultra-low frequencies, the rubber isolated shock mount should be used to reduce

low-frequency mechanical vibrations transmitted through the microphone stand.

Flat response. Provides the most natural sound in most applications.

Low-frequency cutoff. Provides an 18

dB-per-octave cutoff at 80 Hz. Helps

eliminate floor rumble and low-frequency

room noise from 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.

Low-Frequency Rolloff. Provides a 6

dB-per-octave rolloff filter at 115Hz. Use this

to compensate for proximity effect or to

reduce low frequencies that could make an

instrument sound dull or muddy.

20 100050 100 98765432

+5

0

–10

Hz

dB

Low-Frequency Cutoff

Low-Frequency Rolloff

Flat Response

FIGURE 2. LOW FREQUENCY RESPONSES

5

Setting Attenuation

The attenuation switch on the back of the KSM27 reduces the signal level from the

cartridge by 15 dB without altering the frequency response. This can prevent

extremely high SPLs (ie. close miked drums and guitar cabinets) from overloading

the microphone. To activate attenuation, move the switch to the “-15 dB” position.

0 dB – Use this switch for “quiet” to “normal” sound levels.

-15 dB – Use this switch position when in close proximity with extremely loud

sound sources such as kick drum, snare drum, or loud guitar cabinets.

Integral Pop Filter

The KSM27 grille consists of 3 separate mesh layers that act as an integral pop filter

which helps reduce wind and breath noise. Depending on the performer, an external

pop-protection screen or windscreen (See Figure 3) may be necessary when

close-miking vocalists.

FIGURE 3. PS–6 POPPER STOPPERT POP FILTER

Load Impedance

Shure recommends a load impedance of at least 1000 Ω. When used with modern

microphone preamplifiers (rated at 2500 Ω), the KSM27 provides higher maximum

SPL capability and output clipping level. When the attenuation switch is set to the

–15 dB position, the KSM27 can handle sound pressure levels of up to 152 dB and

output +15 dBV into a load of 2500 Ω or greater.

6

SPECIFICATIONS

Cartridge Type Externally Biased Condenser

Frequency Response 20 to 20,000 Hz (see Figure 4)

Directional Polar Pattern Cardioid (see Figure 5)

Output Impedance EIA Rated at 150 Ω (140 Ω actual)

Attenuation Switch 0 or 15 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 5.4 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 53.0 mm (2.08 in.) maximum body diameter,

156.2 mm (6.15 in.) long; 642 grams (22.6 oz.)

(see Figure 6)

Sensitivity (typical, at 1000 Hz;

1Pa = 94 dB SPL) –37 dBV/Pa

Self–noise (typical, equivalent SPL;

A–weighted, IEC 651) 14 dB

Maximum SPL at 1000 Hz

2500 Ω load (Attenuator on)

1000 Ω load (Attenuator on)

137 (152) dB

132 (147) dB

Output Clipping Level*

2500 Ω load

1000 Ω load

7 dBV

1 dBV

Dynamic Range

2500 Ω load

1000 Ω load

123 dB

118 dB

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.

7

60 cm

20 200001000 1000050 100 98765432 98765432

+10

0

–10

Hz

dB

FIGURE 4. TYPICAL FREQUENCY RESPONSE

FIGURE 5. TYPICAL POLAR PATTERNS

FIGURE 6. DIMENSIONS

156,2 mm

(6.15 IN.)

50,8 mm

(2.00 IN.)

53,0 mm

(2.08 IN.)

150,1 mm

(5.90 IN.)

8

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 KSM27 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.

N 108

FURNISHED ACCESSORIES

ShureLocktRubber Isolated Shock Mount A27SM. . . . . . . . . . . . . . . . . . . . . .

Protective Velveteen Pouch A27VB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPTIONAL ACCESSORIES

ShureLocktBlack Swivel Adapter A32M. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Aluminum Carrying Case A32SC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Windscreen A32WS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Popper StoppertPop Screen PS–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Padded, Zippered Carrying Bag A32ZB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REPLACEMENT PARTS

Rubber Rings for Shock Mount (contains four) RPM642. . . . . . . . . . . . . . . . . . .

Replacement Foam for Carrying Case 29A2284. . . . . . . . . . . . . . . . . . . . . . . . .

SERVICE

For additional microphone service or parts information, please contact the Shure

Service department. Outside the United States, please contact your Authorized

Shure Service Center.

Trademark Notices: The circular S logo, the stylized Shure logo, and the word

“Shure” are registered trademarks of Shure Incorporated in the United States.

“ShureLock” 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.

Patent Notice: Patent Des. 400,540 Des. 447,131