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Model 512 User Guide
27C8114 (Rev. 7) Printed in U.S.A.
©2010, Shure Incorporated
GENERAL
Shure Model 512 combines an efficient “open-air” headphone
with a close-talking dynamic microphone. The unit is unobtrusive,
durable, comfortable, and provides a wide frequency range.
The 512 was designed for sports and news announcing, intercom-
munications systems, and special events remote broadcasting. It
offers convenient hands-free operation, and a lightweight frame
to reduce user fatigue. The unidirectional pickup pattern reduces
unwanted background noise, permitting its use in noisy environ
-
ments. The microphone characteristics are tightly controlled
resulting in consistent response and output, and the headphone
response is tailored to enhance voice intelligibility.
The headband easily adjusts to fit a variety of head sizes and hair-
styles, and the microphone boom can be adjusted to accurately
place the microphone cartridge at the corner of the user’s mouth.
The microphone is supplied with a foam windscreen to reduce
explosive “popping” sounds, and a cable clip to secure the cable
to clothing.
SPECIFICATIONS
MICROPHONE
Type
Dynamic, close-talking
Frequency Response (at 8 mm 5/16 in.)
50 to 15,000 Hz
20 200001000 1000050 100
98765432 98765432
+10
0
–10
Hz
dB
-20
+20
Polar Pattern
Cardioid (unidirectional) response - uniform with frequency,
symmetrical about axis.
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
1000 Hz
4000 Hz
500 Hz
Impedance
Microphone rating impedance is 150 Ohms (200 Ohms actual)
for connection to microphone inputs rated at 19 to 300 Ohms.
Output Level (closed-talked at 1,000 Hz)
Open-circuit voltage -47.0 dB (4.5 mV)
0 dB=1 volt per 100 microbars
Power Level -66.0 dB
0 dB=1 milliwatt per 10 microbars
Hum Sensitivity (typical)
38.4 dB equivalent SPL in 1 millioersted field
Polarity
Positive pressure on diaphragm produces positive voltage on
red lead and pin 2 of connector
.
HEADPHONE
Type
Dynamic, open-air, left side only
Frequency Response
100 to 10,000 Hz, tailored for voice intelligibility.
20 200001000 1000050 100
98765432 98765432
+10
0
–10
Hz
dB
-20
+20
Impedance
300 Ohms at 1,000 Hz