Shure KSM27 Bedienungsanleitung

User Guide

27D3138 (Rev. 6) Printed in U.S.A.

SHURE INCORPORATED

KSM27 CARDIOID CONDENSER MICROPHONE

Thank you for selecting the KSM27

O v e r 7 5 y e a r s o f a u d i o e x p e r i e n c e h a s c o n t r i b u t e d t o m a k i n g t h e K S M 2 7

one of the finest microphones available.

If you have any questions that are 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.

FIGURE 1. KSM27 FRONT AND BACK

GENERAL DESCRIPTION

The Shure®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 extend-

ed frequency response specially tailored for vocal tracking and instrument recording.

FEATURES

• Cardioid polar pattern - the most commonly used pattern for both studio and live

applications

• 1 inch, externally biased, ultra-thin, 2.5

m, 24 Karat gold-layered, low mass, Mylar

diaphragm provides superior transient response

• Class A, discrete, transformerless preamplifier for transparency, extremely fast

transient response and no crossover distortion, while minimizing harmonic and

intermodulation distortions

• Premium electronic components and gold-plated internal and external connectors

• Subsonic filter eliminates rumble from mechanical vibration below 17 Hz

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

• 3-position switchable low-frequency filter helps reduce unwanted background noise

or counteract proximity effect

• Integrated three-stage “pop” protection grille reduces plosives and other breath

noise

• Internal shock mount reduces handling and stand noise

KSM27 BACKKSM27 FRONT

Low-frequency

response switch

15 dB

attenuator

PERFORMANCE CHARACTERISTICS

• Extended frequency response

•Lowselfnoise

• Exceptional low-frequency reproduction

• High output level

• High input SPL capability

• No crossover distortion

• Extremely uniform polar response

• Superior common mode rejection and suppression of radio frequency

interference

APPLICATIONS

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

crophone. Typical applications include:

• Voice and vocals

• Close-miking of acoustic instruments such as piano, guitar, violins, drums, and

percussion

• Electric guitar amplifiers

• Brass and woodwind instruments

• Low-frequency instruments such as double bass and kick drum

• Overhead miking for drums or percussion

• Orchestras, choirs, wind ensembles

• Room ambience pick-up (guitar amplifier or drums)

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

tics. To acheive the best overall sound for a particular application, it may be neces-

sary 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 termi-

nated with XLR connectors at each end.

Positioning the Microphone

The front of the KSM27 is marked by the 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 sen-

sitive 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 re-

duce wind noise, room noise or proximity effect. Since the microphone will repro-

duce 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 condition-

ing systems. This setting may also be

used to compensate for proximity effect or

to reduce low frequencies that make an in-

strument 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.

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 ex-

tremely 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.

20 100050 100

98765432

–10

Flat Response

Low Frequency Cutoff

Low Frequency Rolloff

FIGURE 2. LOW FREQUENCY RESPONSES

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 STOPPER™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.

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 difference between 94 dB SPL and equivalent SPL of self-noise A-weighted.

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 Ωactual)

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), posi-

tive 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 posi-

tive 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 Ωload (Attenuator on)

1000 Ωload (Attenuator on)

137 (152) dB

132 (147) dB

Output Clipping Level*

2500 Ωload

1000 Ωload

7 dBV

1 dBV

Dynamic Range

2500 Ωload

1000 Ωload

123 dB

118 dB

Signal to Noise ratio** 80 dB

FIGURE 4. TYPICAL FREQUENCY RESPONSE

FIGURE 5. TYPICAL POLAR PATTERNS

FIGURE 6. DIMENSIONS

60 cm

20 200001000 1000050 100

9876543

876543

+10

–10

180°

150°

120°

90°

60°

30°

150°

120°

90°

60°

30°

–20 dB

–15 dB

–10 dB

–5 dB

+5 dB

180°

150°

120°

90°

60°

30°

150°

120°

90°

60°

30°

–20 dB

–15 dB

–10 dB

–5 dB

+5 dB

250 Hz

500 Hz

1000 Hz 10000 Hz

6400 Hz

2500 Hz

156,2 mm

(6.15 IN.)

150,1 mm

(5.90 IN.)

50,8 mm

(2.00 IN.)

53,0 mm

(2.08 IN.)

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.

FURNISHED ACCESSORIES

ShureLock™Rubber Isolated Shock Mount . . . . . . . . . . . . . . . . . . . . . . A27SM

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

OPTIONAL ACCESSORIES

ShureLock™Black Swive Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A32M

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

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

Popper Stopper™Pop 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 Shure's Ser-

vice department at 1-800-516-2525. Outside the United States, please contact your

Authorized Shure Service Center.

N 108

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