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Shure 577B User Manual

Page 2

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CIRCUIT MODIFICATION
To modify the microphone circuit for normally shorted operation,
proceed as follows:
1. Remove the three No. 6 Phillips screws from the back of the

microphone case.

2. Separate the front and back sections of the case, and remove

the press-to-talk switch button.

3. Unsolder or clip the GREEN cable lead from the press-to-talk

switch solder lug.

4. Solder the GREEN cable lead to the GREEN cartridge lead on

the press-to-talk switch solder lug.

5. Replace the press-to-talk switch button in the front section of

the case, then join the case halves together and install the No.
6 Phillips screws removed in Step 1 above.

SPECIFICATIONS
Type

Dynamic, noise-canceling

Frequency Response

100 to 5,000 Hz (see Figure 2)

TYPICAL FREQUENCY RESPONSE

FIGURE 2

Impedance (at 1000 Hz)

Rated at 150 Ω (175 Ω actual) for connection to microphone

inputs rated at 19 to 300 Ω.

Output Level (at 1,000 Hz, 5/16 in.)

Open Circuit Voltage-66.0 dBV/Pa (0.5 mV)

0 dB = 1 volt per 1 Pascal/94 dB SPL

Hum Sensitivity

Equivalent to 32 dB SPL in 1 millioersted field

Operating Temperature Range

-40° to 74° C (-40° to 165° F)

Switch Type

Double-pole, single-throw, leaf-type, push-to-talk

Cable

Non-detachable. 1.8 m (6 ft), neoprene-jacketed coil cord,

four-conductor (two conductors shielded).

Case

Two-tone gray, high-impact ARMO-DUR

®

Dimensions

See Figure 3

OVERALL DIMENSIONS

FIGURE 3

Net Weight

330 grams (11.6 oz)

CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Directive
89/336/EEC. Meets applicable tests and performance criteria in
European Standard EN55103 (1996) parts 1 and 2, for residential
(E1) and light industrial (E2) environments.

SUPPLIED ACCESSORY
Mounting Bracket (3 per kit) .......................................... RK6MB

REPLACEMENT PARTS
Cartridge ........................................................................... R98B
Cable .................................................................................. C117
Switch............................................................................ RK338S

SERVICE INFORMATION
For additional service or parts information, please contact Shure's
Service department at 1-800-516-2525. Outside the United States,
please contact your authorized Shure Service Center.

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

B

d

MICROPHONE

MOUNTING BRACKET

46 mm

36.5 mm

4.7 mm

34.5 mm

10.3 mm

9.5 mm

9.1 mm

(23/64 IN.)

(3/8 IN.)

(1-13/16 IN.)

(1-7/16 IN.)

(3/16 IN.)

(1-23/64 IN.)

(13/32 IN.)

MOUNTING HOLES,
CLEARANCE FOR
No. 8 SCREWS

67 mm

(2-5/8 IN.)

94 mm

(3-11/16 IN.)

45 mm

(1-25/32 IN.)

8 mm

(5/16 IN.)

14 mm

(9/16 IN.)

41 mm

(1-19/32 IN.)

19 mm

(3/4 IN.)

18 mm

(23/32 IN.)

4.8 mm

(3/16 IN.)

SHURE Incorporated http://www.shure.com
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Intl Fax: 847-600-6446
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414
Asia, Pacific:
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055