Shure SM81 Handleiding

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MODEL SM81

UNIDIRECTIONAL CONDENSER MICROPHONE

The Shure Model SM81 is a high-quality, unidirectional

condenser microphone designed for studio recording, broad-

casting, and sound reinforcement. Its wide frequency re-

sponse, low noise characteristics, and low RF susceptibility

have made it a standard for applications involving acoustic in-

struments, especially guitar, piano, and cymbals.

The SM81 is ruggedly constructed. It operates on phantom

power and performs over a wide range of temperatures and hu-

midity conditions. It is furnished with a swivel adapter, attenua-

tor-switch lock, foam windscreen, and case for carrying and

storage. Other accessories are available.

Model SM81 Features

•20 Hz to 20 kHz frequency response

•Flat response curve for accurate reproduction of sound

sources

•Low noise and high output clipping level

•Low distortion over a wide range of load impedances

•Cardioid polar pattern, uniform with frequency and symme-

tric about axis, providing maximum rejection and minimum

coloration of off-axis sounds

•Low RF susceptibility

•Selectable low-frequency response: flat, 6 or 18 dB/octave

rolloff

•0 dB/10 dB lockable attenuator switch

•Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)

•Rugged steel construction for durability

•Field-usable over wide range of temperature and humidity

conditions

SPECIFICATIONS

Type

Condenser (electret bias)

Frequency Response

20 to 20,000 Hz (see Figure 1)

20200001000 10000

50 100

98765432 98765432

+10

0

–10

Hz

dB

1 METER

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Polar Pattern

Cardioid (unidirectional) response—uniform with

frequency, symmetrical about axis (see Figure 2)

150o

120o

150o

120o

180o

30o

60o

90o

30o

60o

90o

–5 dB

–10 dB

–15 dB

–20 dB

0

500 kHz

100 Hz

1 kHz

150o

120o

150o

120o

180

o

30o

60 o

90o

30 o

60o

90o

–5 dB

–10 dB

–15 dB

–20 dB

0

2 kHz

5 kHz

10 kHz

TYPICAL POLAR PATTERNS

FIGURE 2

Output Impedance

Rated at 150 Ω (85 Ω actual)

Recommended minimum load impedance: 800 Ω (May

be used with loads as low as 150 Ω with reduced clip-

ping level)

Output Configuration and Connector

Balanced, transformer-coupled output; male XLR con-

nector

Sensitivity (at 1,000 Hz)

Open Circuit Voltage–45 dBV/Pascal (5.6 mV). . . . . . . (1 Pascal = 94 dB SPL)

Clipping Level (at 1,000 Hz)

800 Ω Load –4 dBV (0.63 V). . . . . . . . . . . . . . . . . . . . . . .

150 Ω Load–15 dBV (0.18 V). . . . . . . . . . . . . . . . . . . . . .

Total Harmonic Distortion

Less than 0.5% (131 dB SPL at 250 Hz into 800 Ω load)

Model SM81 User Guide

27B2916 (BJ)

E2002, Shure IncorporatedPrinted in U.S.A.

Product specificaties