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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 pattern
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 200001000 1000050 100
9876543298765432
+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