Shure 548, 548SDY, 5488 User Guide

I

222 HARTREY

D

MICROPHONES

AREA CODE 3121866-2200 - CABLE: SHUREMICRO

@

TWX: 910-231-0048 TELEX: 72-4381

AVE..

EVANSTON.

AND

ELECTRONIC

IL.

60204 U.S.A.

COMPONENTS

1

:/ET

MODELS 548,548SDY

UNIDYNEO IV

SERIES

and

5488

I

UNIDIRECTIONAL DYNAMIC MICROPHONES

GENERAL Microphone Features:

The

UNIDYNE@ IV Models 548, 548SD, and 5488 are
dual-impedance unidirectional dynamic microphones
shipped connected for low-impedance operation. The
units provide wide range reproduction of music and
voice and can be effectively used outdoors and indoors.

The UNIDYNE
entertainers in high quality theater-stage sound sys­tems and recording, as well as in critical public-address
systems such as those used in political conventions
and legislatures, convention halls, hotels, public audi­toriums, stadiums, cathedrals and churches.

The UNIDYNE
directional pickup pattern that provides an effective
solution to feedback problems in reverberant locations,
permits best utilization of space in small studios,
facilitates orchestral placement,
wanted background noise. the microphone

The UNIDYNE
metal case and a shock-mounted cartridge, insensitive
to handling noise or mechanical vibration.

Models 548 and
microphones or they can be stand-mounted with the
supplied
designed for applications where
quired; Model 548SD is equipped with a magnetic reed indoors or outdoors
On-Off switch. Model
attached swivel assembly for stand-mounting.

A25B slip-in swivel adapter. Model 548 is

IV is ideal for use by professional

IV has an exceptionally uniform uni-

and excludes un-

IV features an extremely rugged all

548SD can be used as hand-held

a

switch is not re- . Versatile-for use in the hand or on a stand-

5488 has an On-Off switch on the

Unusually effective cardioid (unidirectional) pickup
pattern reduces feedback (annoying loudspeaker
"squeals") and prevents echoing (boominess) that
sometimes occurs in partially filled halls. Can also
be used closer to loudspeakers than usual without
creating feedback problems

Response especially effective for announcing, nar­ration, vocal and instrumental music

Shock-mounted cartridge for quiet operation
Convenient selection of either high or low imped-

ance

.

Built-in long-life On-Off switch (5488, 548SD, and
548SD-CN)

.

Rugged professional three-pin audio connector on

Strong, detachable cable especially selected for
effective shielding from hum pickup

Supplied with an
setscrew (see Figure
phone to the cable connector (548,

548SD-CN)

Rugged and dependable under all operating con­ditions

.050" wrench and a 4-40 socket

4)

to securely lock the micro-

548SD, and

VARIATION Available in four versions: without switch

Model 548SD-CN: Same as Model
supplied with professional three-pin male audio con­nector on equipment end of cable. (See Specifications
for details on cable.)

Copyright

27A1298

1978,

(RL)

Shure Brothers

Inc.

548SD, except

with magnetic reed On-Off switch (548SD), with

magnetic reed On-Off switch and three-pin

fessional audio-connector on equipment end of

(548SD-CN), and with On-Off switch mounted

cable

on attached swivel assembly

(5485)

U.S. Patents

3,132,713. and 3,240.883

(548),

pro-

Printed in U.S.A.

SPECIFICATIONS

Type

Dynamic

Frequency Response

40 to 15,000 Hz (see Figure 1)

male audio connector? on the microphone end and
a professional three-pin male audio

connectort on

the equipment end

t

Designed to mate with Cannon

A3

(Q.G.)

series or equivalent connector.

XL

series, Switchcraft

Dimensions

See Figure

3

TYPICAL

FREQUENCY

FIGURE

RESPONSE

1

Polar Pattern

Cardioid (unidirectional)-uniform with frequency,
symmetrical about axis (see Figure 2)

TYPICAL DIRECTIONAL PATTERN

POLAR

PATTERN

FIGURE

TYPICAL DIRECTIONAL PATTERN

2

0.

Impedance

Dual. Microphone rating impedance is 150 ohms
(240 ohms actual) for connection to microphone
inputs rated at 19 to 300 ohms and "High" for con­nection to high-impedance microphone inputs. Wired

for low impedance as shipped.

Output Level (at 1,000 Hz)

IMPEDANCE

Low High

Open Circuit Voltage*

. .

. . . -76.0

-

dB -54.0 dB

-

(.I58 mV) (2.0 mV)

Power Level**

.

. . . . . . . . . . .

-

56.0

dB

*O dB = 1 volt per microbar

**0 dB = 1 milliwatt per 10 microbars

Switch

548SD and 548SD-CN: Built-in magnetic reed On-

Off switch with lockplate. To lock switch in On
position, remove screw on lockplate and turn
plate 180". Reassemble and tighten screw.

5488: Built-in slide-to-talk, positive detent On-Off

switch mounted on attached swivel assembly.

Cartridge Shock Mount

Internal rubber vibration-isolator

Swivel

lock-

MODELS 548,

MODEL

Weight

Net Combined

(less cable) Net Packaged

5488 4609 7339 944g

(16 oz)

548 & 548SD 31 1 g

(1 1 02) (25% oz)

548SD-CN

31 1 g 7789 9759

(1 1 02) (30% oz) (381/! oz)

Models 548, 548SD, 548SD-CN, and 548s are dual­impedance microphones for connection to a 19 to 300
ohm rated input or to a high-impedance input. The mi­crophones are shipped from the factory connected for
low-impedance operation.

The low-impedance connection (as shipped) is
recommended where long cable lengths are required
or under conditions of severe hum disturbance. The
permissible cable length is practically unlimited since
neither response nor level is appreciably affected by
long cables. Shure Model A95
Transformers are available for use when a
ance microphone line is desirable but the associated

548SD

OVERALL

5485

DIMENSIONS

-

OVERALL

FIGURE

OPERATION

AND

548SD-CN

DIMENSIONS

3

(28% oz)

(37 oz)

7239 8429

(33 02)

Series Line Matching

low-im~ed-

548s: Positive action, permits tilting microphone amplifier has a high-impedance input. These trans-

through

%"-27 thread

Swivel Adapter

548.
able throuih 90" from vertical to horizonta~,'~e~mits
easy removal for hand-held use, suitable for mount­ing on stand with %"-27 thread

Case

Black and satin-chrome finished all-metal case and

grille with stainless steel screen

Cable

548, 548SD, 548s-4.6m (15 ft) two-conductor
shielded (rubber-jacketed) with a professional
pin female audio connectort on the microphone end

548SD-CN-6.lm (20 ft) two-conductor shielded
(rubber-jacketed) with a professional three-pin

180°, suitable for mounting on stand with

formers provide a proper impedance match between a
19 to 300 ohm microphone line and a high-impedance
input and are available with various input and output

548SD. and 548SD-CN: Positive action, adiust- COnneCtors.

Models 548, 548SD, and 548SD-CN are shipped con­nected for low-impedance operation. To change to
high impedance (see Figures

follows:

1. Remove plug element at receptacle end of mi­crophone by turning slotted setscrew in (counter-

three-

clockwise) and carefully withdrawing plug ele­ment from case.

2. Disconnect 2-terminal impedance selection sock-

fe-

et from rear of plug element.

IMPEDANCE SELECTION

4

and 5), proceed as