Shure SM18W, SM18 User Guide

Polar Pattern

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

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-,"HI

........ 5kH 1

TYPICAL HORIZONTAL POLAR PATTERN

FIGURE 2

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", l m (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 voltage on pin 2 with respect to pin 3 (see Figure 3).

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CARTRIDGE CABLE CONNECTOR

,BLACK '

INTERNAL CONNECTIONS

FIGURE 3

Cable

2.7m (9 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 series, Switchcraft A3 (Q.G.) series, or equivalent connector.

Case

Elliptical shaped open-cell acoustic foam shock mount enclosure (SM18B foam is brown; SM18W foam is white), holds microphone at 10" angle from horizontal with diaphragm approximately 3.2 mm ('/a in.) from mounting surface.

Dimensions

See Figure 4.	4 7 6 m m
	1 1 - 7 / 8 1 " !
	6 4 m m
r T O P	I - ionln)

FRONT

8 9 m m

C A B L E

( 3 - 1 / 2 i n !

2 7 m

SUPPORTING

SURFACE

OVERALL DIMENSIONS

FIGURE 4

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 at 1m (39.4 in.), 25" from a sound source and mounted 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 microphone inputs rated at 19 to 300 ohms.

The microphone output shall be -53.0 dB where 0 dB = 1 milliwatt per 10 microbars.

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 series, Switchcraft A3 (Q.G.) series, or equivalent connector.

The overall dimensions of the microphone shall be 44.5 mm (1% in.) in height, 47.6 mm (1% in.) in width, and 89 mm (3% in.) in depth.

The microphone shall be the Shure Model SMIBB, SMIBW, or equivalent.

REPLACEMENT PARTS
	SM18B	SM18W
	-	-
Foam Enclosure . . . . . . . . . . . . . . . .	RK204F	RK205F
Cable and Connector . . . . . . . . . . . .	C92	C93
Cartridge . . . . . . . . . . . . . . . . . . . . . .	R105	R105
Cartridge Case, Top . . . . . . . . . . . . .	65A1271	65A1271
Cartridge Case, Bottom . . . . . . . . . .	65A1270	65A1270

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 consequential 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.