Shure SM81 Bruksanvisning

Shure mikrofon SM81

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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)

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

20 200001000

10000

50 100

98765432

+10

–10

1 METER

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Polar Pattern

Cardioid (unidirectional) response—uniform with

frequency, symmetrical about axis (see Figure 2)

150

120

150

120

180

–5 dB

–10 dB

–15 dB

–20 dB

500 kHz

100 Hz

1 kHz

150

120

150

120

180

–5 dB

–10 dB

–15 dB

–20 dB

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 Incorporated

Printed in U.S.A.

Produktspecifikationer

Varumärke:	Shure
Kategori:	mikrofon
Modell:	SM81
Gränssnitt:	XLR-3
Modell:	Scenmikrofon
Mikrofonfrekvens:	20 - 20000 hz
Produktens färg:	Metallisk
Vikt inkl. förpackning:	740 g
Mikrofonvikt:	230 g
Mikrofon känslighet (utnivå):	-45 dB
Strömförbrukning:	1.2 mA
Signal/brusförhållande (SNR):	78 dB
Mikrofon, riktning:	Riktad
Mikrofon ingångsimpedans:	150 Ω
Mikrofonmått (D x H):	23.5 x 212 mm