Shure 512 Headset Microphone User Manual

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, in­tercommunications systems, and special events remote
broadcasting. It o ffers 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 environments. 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
hairstyles, 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.

Model 512 Headset

Microphone User Guide

Polar Pattern

Cardioid (unidirectional) response – uniform with frequen­cy, 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 volt­age on red lead and pin 2 of connector.

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

2002, Shure Incorporated
27B8114 (BL)

HEADPHONE

Type

Dynamic, open-air, left side only

Frequency Response

100 to 10,000 Hz, tailored for voice intelligibility (see Fig­ure 3).

TYPICAL HEADPHONE FREQUENCY RESPONSE

Figure 3

Printed in U.S.A.

Impedance

300 Ohms at 1,000 Hz

Polarity

Positive voltage on cable conductor produces positive
pressure.

Output Level (at 1,000 Hz)

94 dB SPL at ear with 1 mW input

INTERNAL CONNECTIONS

Figure 4

MATERIAL

Cable

2.1 m (7 ft.) attached cables: one 2-conductor shielded
with black 3-pin XLR connector (microphone) and one
single-conductor shielded with 2-circuit phone plug
(headphones).

Headset

Stainless steel and thermoplastic with foam earpads.

Dimensions

See Figure 5.

USING THE MICROPHONE

Snap the microphone boom into the rotating holder below
the left earpiece. Put on the headset and adjust the earpads
to the most comfortable position. The headset is designed
for use with the microphone mounted on the left side. Slide
and twist the microphone boom and rotate its holder until the
microphone is located as close as possible to the left corner
of the mouth (not directly in front). See Figure 6 for ideal
placement.

MICROPHONE PLACEMENT

Figure 6

REPLACEMENT PARTS

Microphone Cartridge R93. . . . . . . . . . . . . . . . . . . . . . . . . .

Headphone Cartridge 90FA2600. . . . . . . . . . . . . . . . . . . .

Pop Filter 90RX1371. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Foam Earpad 49A78A. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OVERALL DIMENSIONS

Figure 5

Net Weight

186 grams (6.5 oz.) including connectors

SHURE Incorporated Web Address: http://www.shure.com
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
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