27B8114 (BL)
2002, Shure Incorporated
Printed in U.S.A.
GENERAL
Shure Model 512 combines an efficient “open-air” head-
phone with a close-talking dynamic microphone. The unit is
unobtrusive, durable, comfortable, and provides a wide fre-
quency range.
The 512 was designed for sports and news announcing, in-
tercommunications systems, and special events remote
broadcasting. It offers convenient hands-free operation, and
a lightweight frame to reduce user fatigue. The unidirection-
al pickup pattern reduces unwanted background noise, per-
mitting its use in noisy environments. The microphone char-
acteristics are tightly controlled resulting in consistent
response and output, and the headphone response is tai-
lored to enhance voice intelligibility.
The headband easily adjusts to fit a variety of head sizes and
hairstyles, and the microphone boom can be adjusted to ac-
curately place the microphone cartridge at the corner of the
user’s mouth. The microphone is supplied with a foam wind-
screen 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 (see Figure 1)
TYPICAL MICROPHONE FREQUENCY RESPONSE
Figure 1
Polar Pattern
Cardioid (unidirectional) response – uniform with frequen-
cy, symmetrical about axis (see Figure 2).
TYPICAL POLAR PATTERNS
Figure 2
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 volt-
age 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 (see Fig-
ure 3).
TYPICAL HEADPHONE FREQUENCY RESPONSE
Figure 3
Model 512 Headset
Microphone User Guide
