Shure SM51 User Guide

22 2 HARTREY AVEN UE. EVANSTON,

GENERAL: The Model SM51 is a small dynamic

lavalier microphone designed for use in television, motion pictures, radio, which a small, wearable microphone of professional quality is required.

Features include:

l Frequency response optimized for lavalier use.

Will match well, in sound, with stand or desk mounted microphones.

l Small size, lightweight.

l Positive-locking lavalier holder with adjustable

clothing clip.

l Smooth exterior contours and recessed grille for

minimum clothing noise.

l Rugged construction-steel case for strength

and magnetic shielding.

l Cable field replaceable without disturbing car-

tridge.

The versatile “Positive-Lock” lavalier holder provides simple, noiseless adjustment of microphone position and holds the microphone firmly in the selected position. A belt clip is also provided to permit attaching

the cable at the waistband to relieve cable weight and

pull, absorb sudden tugs on the cable, and minimize cable noise.

and similar applications in

ILLIN OIS / AREA CODE 31 2 / 32 8-9 00 0 / CABLE:

FIGURE C

TO WEAR MICROPHONE: Slide microphone

through opening in lavalier assembly (Figure D). While pushing

“cord lock” plunger on right side of lavalier assembly, slide cord into slot--adjust cord length and release plunger.

Engage shirt or blouse with clip. The

clip may be installed on lavalier assembly for right or

left side opening or for vertical “pen clip” use; or may be removed by sliding clip out of slotted retainer.

TO REMOVE MICROPHONE: Disengage

clip-push “Cord Lock” from lavalier assembly slot.

27A372 (5-67)

plunger and remove cord

(OVER)

LAVALIER ASSEMBLY AND BELT CLIP

FIGURE D

Printed in U.S.A.

SPECIFICATIONS:

NET WEIGHT: (Less cable) 2 ounces (58 grams)

TYPE: Dynamic

FREQUENCY RESPONSE: From 70 to 12,000

Hz. Rising Characteristic to 6,000 Hz. See Figure A.

POLAR PATTERN: Omni-directional

IMPEDANCE: Properly matches any low impe-

dance input from 50 to 250 ohms

VOLTAGE SENSITIVITY:

1,000 Hz. response

Open circuit voltage level. . . . . . . . . . .-82.0 db*

Power level . . . . . . . . . . . . . . . . . . .

EIA Microphone Rating

Gm (sensitivity) . . . . . . . . . . . . -153.5 db***

Output level -0.079 millivolt per microbar

*0 db =

** 0 db =1 milliwatt with 10 microbars

***0 db =EIA Standard SE-105, August 1949

1 volt per microbar

-60.5 db**

CABLE: Non-detachable 30-foot, two-conductor

shielded Broadcast type.

CASE FINISH: Non-reflecting gray with stainless

steel grille

DIMENSIONS: See Figure B

SHIPPING WEIGHT: 1½ Pounds (680 grams)

GUARANTEE: Each microphone is guaranteed to

be free from electrical and mechanical defects for a period of one year from date of shipment from fac-

tory, provided all instructions are complied with fully.

In case of damage, return the microphone to the

factory for repairs.

ARCHITECT’S SPECIFICATION: The mi-

crophone shall be the Shure Brothers, Inc. Model SM51

Dynamic Lavalier Microphone or equivalent. The microphone shall be a moving-coil (dynamic) type microphone with a frequency range of 70 to 12,000

Hz. The unit shall have an omnidirectional polar char-

acteristic. The microphone shall be a single impedance microphone having a rating impedance of 150 ohms. The microphone rating Gm (sensitivity) at 1,000 Hz. shall be within ± 3 db of -153 db (EIA Standard

SE- 105, August 1949.)

The microphone shall be provided with a lavalier cord and clip assembly for use as a wearable microphone. The microphone shall be provided with a 30-foot, twoconductor shielded cable. The overall dimensions shall

be 2-15/32 inches (62.7 mm) in length and 13/16

inches (20.6 mm) in diameter.

REPLACEMENT PARTS

The following replacement parts and accessories may

be ordered through your authorized Shure Professional Microphone Distributor or from Shure Brothers, Incorporated.

Description

Cable . . . . . . . . . . . . . . . . . . . . . .

Lavalier Assembly . . . . . . . . . . . . .

Belt Clip . . . . . . . . . . . . . . . . . . .

Swivel Adapter . . . . . . . . . . . . . . .

Shure Part No.

70A2007

A51L

94A240

A57R