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Model 515SBGX, 515SBG-18X and

515SBG-18XF User Guide

©

2009 Shure Incorporated

27E2974 (Rev. 

9

)

Printed in U.S.A.

GENERAL

The Shure Models 515SBGX, 515SBG-18X, and 515SBG-18XF 
microphones are low-impedance dynamic microphones designed 
to be mounted on flexible goosenecks or fixed pips. Optimized fre-
quency response and a unidirectional (cardioid) pickup patter

n

 

makes them ideal for language labs, paging applications, and base 
station communications. They are also recommended for use as 
talkback or cuing microphones in TV, film, and recording studios. 
Because of their low impedance, these microphones retain their 
level and response characteristics even when long lengths of cable 
are used.
All three models are supplied with a push-to-talk button and a 
four-conductor cable (two conductors shielded).

Features

• Frequency response optimized for announcing, narration, and

paging applications

• Cardioid pickup pattern symmetrical about axis 
• Neodymium magnet for high signal-to-noise ratio
• Shock-mounted cartridge for quiet operation and low stand/han-

dling noise

• Tough diecast locking grille and handle
• Built-in push-to-talk button controls microphone circuit and relay

or control circuit

• 45.7 cm (18 in.) gooseneck and mounting flange supplied

(515SBG-18X and 515SBG-18XF only)

VARIATIONS

MODEL 515SBGX: 

Does not include gooseneck or mounting

flange

MODEL 515SBG-18X:

 Includes gooseneck and 76.2 mm (3 in.)

diameter mounting flange

MODEL 515SBG-18XF

: Includes gooseneck and 44.4 mm 

(1-3/4 in.) diameter mounting flange 

SPECIFICATIONS

Type

Dynamic (moving coil)

Frequency Response

80 to 15,000 Hz (see Figure 1)

TYPICAL FREQUENCY RESPONSE

FIGURE 1

Polar Pattern

Cardioid (unidirectional). Effective rejection of sound at rear of mi-
crophone is uniform at all frequencies, while front pickup charac-
teristics are uniform about axis (see Figure 2). 

TYPICAL POLAR PATTERN

FIGURE 2

Impedance

150 

Ω 

rated (180 

Ω 

actual)

Output Level (at 1,000 Hz)

Open Circuit Voltage: -57 dBV/Pa* (1.4 mV)

*1 PA = 94 DB SPL

Phasing

Positive pressure on diaphragm produces positive voltage on

RED cable relative to BLACK cable lead

515SBGX

515SBG-18X

20

20000

1000

10000

50 100

9

8

7

6

5

4

3

2

9

8

7

6

5

4

3

2

+10

0

–10

Hz

dB

-20

+20

1 cm

(3/8 in.)

.06 cm

(2 ft.)

150

o

120

o

150

o

120

o

180

o

30

o

60

o

90

o

30

o

60

o

90

o

–5 dB

–10 dB

–15 dB

–20 dB

0

10000 Hz

6400 Hz

2500 Hz

150

o

120

o

150

o

120

o

180

o

30

o

60

o

90

o

30

o

60

o

90

o

–5 dB

–10 dB

–15 dB

–20 dB

0

1000 Hz

500 Hz

250 Hz

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