Shure SM18W, SM18 User Guide

SHURE

222

HARTREY AVE , EVANSTON, IL.,

"C]

?ROFESSIONAL PRODUCTS DATA

60204

U.S.A.

AREA CODE 312/866-2200

CABLE: SHUREMICRO

-6-3

SM18B

(Front View)

GENERAL

The Shure Models SM18B and SM18W are inconspicuous, low-profile, foam-encased microphones designed for optimum speech pickup when mounted on an altar, tabletop, podium, or lectern. The brown foam enclosure and cable; the

SM18B has a dark

SM18W has a white foam enclosure and cable. The microphones have cardioid (unidirectional) polar characteristics; they are angled at

10" inside their foam housings to place the cartridge approximately one-eighth inch from the supporting surface. This low-profile design eliminates the

hollow sound associated with tabletop pickup and maximizes the output by using the reflected sound from the tabletop to effectively double the output.

Because surface-reflected sound waves reach the microphones at practically the same time as direct sound

waves, cancellation owing to phase differences between the direct and reflected waves is significantly

reduced, and the two sound waves combine to in-

crease the output by

dB.

The physical and acoustic characteristics of the SM18B and the SM18W make them ideal for use on altars in front of standing clergy or on conference tables where ordinary stand-mounted microphones would be visually distracting. The colors chosen for the foam and cables are designed for maximum unobtrusiveness; the white SM18W will be inconspicuous on a white marble or cloth covered altar; while the brown

SM18B will blend with a

brown wood-finished conference table.

SMl8W

Cardioid polar pattern and 150

(Rear View)

to 10 kHz fre-

quency response for optimum speech pickup Supplied with right-angle three-pin professional

audio connector (male) for ease of hookup

APPLICATIONS

Place the microphone on a table, altar, or lectern. Note that, when viewed from the rear, the circular opening should be nearest the "TOP" of the foam enclosure (see Figure 4). This position ensures that the cartridge is in the optimum position for maximizing speech pickup and minimizing cancellation caused by surface reflections. Aim the front of the foam (the end away from the cable, see Figure 4) toward the

speaker or lecturer.

then be within the

seated or standing speaker will

15"

to 45" angle of maximum pickup

sensitivity. Position the microphone so that it is approxi-

0.9m

mately

ft.) from the mouth of the speaker or

lecturer at any angle up to 45".

SPECIFICATIONS

TY Pe

Dynamic

Frequency Response

150 to 10,000

source, microphone on flat surface (see Figure 1)

Hz,

at 25", Im (39.4 in.) from sound

Microphone Features:

Microphone angled inside foam so cartridge is approximately an eighth inch from supporting surface

Low-profile design eliminates hollow sound caused by phase cancellation in ordinary tabletop pickup

situations

Available with either brown or white foam and matching colored cable to blend with typical surfaces

Designed for altar, conference table, or podium pickup

27A1802

1982,

(BF)

Shure

Brothers

Inc.

+I0

-10

20 50

100

FREWENCY

1p00

HERTZ

TYPICAL FREQUENCY RESPONSE

FIGURE

Printed in

IO.OOO

24000

U.S.A.

Polar Pattern

Cardioid (unidirectional), at Im (39.4 in.) from horizontal sound source, microphone on flat surface (see Figure 2)

.---

50011.

,"HI

........

5kH1

TYPICAL HORIZONTAL POLAR PATTERN

FIGURE

Impedance

Microphone rating impedance is 150 ohms (160 ohms actual) for connection to microphone inputs rated at

19 to 300 ohms.

Output Level

[at 1,000 Hz, 25", lm (39.4 in.) from sound source, microphone on flat surface] Open Circuit Voltage

...........

-75.0 dB (.I8 mV)

0 dB = 1 volt per microbar

Power Level

..........................

-53.0 dB

0 dB = 1 milliwatt per 10 microbars

Phasing

Positive pressure on diaphragm produces positive volt-

age on pin 2 with respect to pin 3 (see Figure 3).

CARTRIDGE CABLE

CODED

/rrn~~.?~

BLACK

CONNECTOR

Net Weight

(less cable)

110 grams (3.9 oz)

Packaged Weight

338 grams (12 oz)

ARCHITECTS' SPECIFICATIONS

The microphone shall be a moving coil (dynamic) type

with a frequency response of 150 to 10,000 Hz measured

1m (39.4 in.), 25" from a sound source and mounted

at on a flat surface. The unit shall have a free field cardioid polar characteristic. The cancellation at the sides shall be 6 dB while the cancellation at the rear shall be 15 to 20 dB. The microphone shall have low impedance with a rated impedance of 150 ohms for connection to micro-

phone inputs rated at 19 to 300 ohms.

The microphone output shall be -53.0 dB where

1 milliwatt per 10 microbars.

0 dB

The microphone shall be designed for use on a flat surface such as an altar or tabletop. The microphone shall be set at

10" from the horizontal in an open-cell

acoustic foam shock mount enclosure that shall be brown

or white. The microphone shall be equipped with a

2.7m (9 ft.) two-conductor shielded cable, either brown or white to match the enclosure. The cable shall be terminated with a right-angle, three-pin professional audio connector (male) designed to mate with Cannon XL

(Q.G.)

series, Switchcraft A3

series, or equivalent con-

nector.

The overall dimensions of the microphone shall be

44.5 mm and 89 mm

The microphone shall be the Shure Model

(1% in.) in height, 47.6 mm (1% in.) in width,

(3% in.) in depth.

SMIBB,

SMIBW, or equivalent.

INTERNAL CONNECTIONS

FIGURE

Cable

2.7m

ft.) two-conductor shielded, small diameter,

attached

(SM18B cable is brown; SMlBW cable is white) with right-angle three-pin professional audio connector (male) designed to mate with Cannon XL

(Q.G.)

series, Switchcraft A3

series, or equivalent con-

nector.

Case

Elliptical shaped open-cell acoustic foam shock mount enclosure white), holds microphone at

with diaphragm approximately 3.2 mm

(SM18B foam is brown; SM18W foam is

10" angle from horizontal

('/a

in.) from

mounting surface.

Dimensions

See Figure

FRONT

SUPPORTING SURFACE

89mm

(3-1/2in!

rTOP

476mm

11-7/81"!

64mm

I-ionln)

CABLE

OVERALL DIMENSIONS

FIGURE 4

REPLACEMENT PARTS

SM18B SM18W

Foam Enclosure RK204F RK205F Cable and Connector Cartridge

......................

Cartridge Case, Top 65A1271 65A1271 Cartridge Case, Bottom

................

............

.............

..........

R105 R105

65A1270 65A1270

C92 C93

GUARANTEE

This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from date of purchase. Please retain proof of purchase date. This guarantee includes

all parts and labor. This guarantee is in lieu of any

and all other guarantees or warranties, express or implied, and there shall be no recovery for any consequen-

tial or incidental damages.

SHIPPING INSTRUCTIONS

Carefully repack the unit and return it prepaid to:

Shure Brothers Incorporated Attention: Service Department 1501 West Shure Drive Arlington Heights, Illinois 60004

If outside the United States, return the unit to your dealer or Authorized Shure Service Center for repair. The unit will be returned to you prepaid.