Shure Pro Master 702 User Guide

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222

HARTREY

AVE.,

EVANSTON,

IL.

60204

U.S.A.

MODEL

702

STAGE MONITOR

AREA CODE 3121866.2200 . CABLE: SHUREMICRO

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

SPEAKER SYSTEM

I

OPERATION AND SERVICE MANUAL

DESCRIPTION

The Shure Model 702 is a high-quality, two-way loud­speaker system designed for localized sound coverage in
on-stage monitor (foldback) applications. The 702 may be
used with virtually any power amplifier capable of deliv­ering up to 50 watts to a 16-ohm load. The Speaker may
be placed in either of two slanted positions facing the
performer.

Excellent sound reproduction is achieved through the
use of two
electric tweeters. The tweeters are arranged in a

firing configuration, providing uniform horizontal cover­age. A volume control permits individual adjustment of
702 volume to suit each performer's needs. Nominal

impedance of the Speaker is 16 ohms with the volume

control at 10. Reduction of the volume control setting

reduces the overall volume and increases the Speaker
impedance. At the
If the 702 is the only Speaker connected to the amplifier,
the 702 volume control should be set to

amplifier volume control adjusted as desired.

The 702 is constructed of 15.9 mm
covered in scuff-resistant black vinyl. The attractive black
sculptured fabric grille is rugged, cleanable, and replace­able if damaged. A retractile handle and balanced design
contribute to ease of transporting. The corners of the 702
are equipped with steel protectors. Rubber feet on two
surfaces provide protection and offer the option of posi­tioning at either a

A heavy-duty,
connecting cable with phone plugs is available as Shure
Model
is available as Model

&inch heavy-duty speakers and three piezo-

cross-

0 setting, the Speaker is turned off.

10 and the

(%

in.) wood and

30" or 60" angle to the stage.

15m (50 ft), 18-gauge, rubber-jacketed

RKC4, and a rugged vinyl slip-on protective cover

A702A.

Frequency Response

TYPICAL FREQUENCY RESPONSE

Sound Pressure

Level (SPL) .EIA rating: 49.5 dB at 9.2m

Phasing (Polarity)

High-Frequency

Section .Three piezoelectric tweeters

Low-Frequency

Section .Two 8 in. speakers

Horizontal Distribution.

........

...........

...........

.

,100 Hz - 20 kHz (see Figure 1)

optimized for natural
range voice reproduction

FIGURE

....

.Positive voltage on phone jack

.SO0 (see Figure 2)

1

(30 ft) from 1 milliwatt;
equivalent to 97 dB at 1.2m
(4 ft) with 1-watt input

tip produces positive sound

pressure

(cross-firing)

wide-

SPECIFICATIONS

Power Rating

Impedance

Copyright 1979. Shure Brothers Inc.
27A1352

(SL)

........

..........

.Maximum recommended ampli-

fier output: 50 watts
continuous, 28 Vrms, 48V peak
to 16 ohms

.16 ohms nominal (volume

control at 10)

LEGEND

...........

TYPICAL POLAR PATTERNS

FIGURE

8

kHz

2

Printed in

U.S.A.

Vertical Distribution

Directivity Factor

R,

(Q)

. . . . . .

Environmental Resistance:

Operating

Temperature.

Storage

Temperature

.

.

. .

. .

. . . . . . . . .

Connectors
Overall Dimensions

Weight

Construction

Optional Accessories

. . . . .

. . . .

. . . . . .

. .

. .

.

. . . . . .

.

.

.llOO

.

.8.1 at 1 kHz full octave measure-

.

.Two parallel-wired phone jacks

.

.

.

.395 mm H x 533 mm W x 264 mm

.

. . .

.9.1 kg (20 Ib)

.

.15.9 mm (5/8 in.) wood, black

.

.

ment

-

7" to 43°C (20" to 110°F)

-

29" to 71 "C (-20" to 160°F)

(15-9/16 in. x 21 in. x

D
10-3/8 in.)

vinyl covering, black fabric
grille, retractile handle, steel

corner protectors, rubber feet

RKC4 15m (50 ft) cable with

phone plugs

A702A Protective Cover

greater average power than does program material. Con­sequently, when setting up or adjusting a sound system
with these Speakers, avoid the use of high-level,

continuous-type test signals.

Speaker Wiring

Determine the approximate distance from amplifier to
Speaker and use the proper wire gauge. Recommended
cables for the sizes listed are:

Distance

0-30m (0-100

30-60m (100-200

To avoid the frequency losses, poor coverage, dead

zones, etc., resulting from improper speaker phasing in

multiple Speaker installations, all Speakers must be wired
in proper polarity. The cables listed above are
coded to insure that identical connections are used. Note

that even common 18-gauge lamp cord ("zip cord") is

phase-coded with ribs along the outer jacket of one con­ductor.

The Shure RKC4 is a
jacketed cable with phone plugs on both ends. The
unused phone jack may be used for additional,

connected Speakers.

ft)

ft)

AWG

18 Gauge Belden #8460, #8461, #9740, Sf8542
I6 Gauge Belden #8470, #8471, #a472

15m (50 ft), 18-gauge, rubber-

Suggested Cable

color-

parallel-

INSTALLATION

General

Position the 702 at the front of the stage in front of the
performer's microphone, with the speaker grille aimed
approximately at the back of the microphone. Note that

the 702 may be used at either a 30" or

horizontal. The angle chosen should be that which pro­vides the most direct line-of-sight to the performer and
also provides minimal visual interference with the audi-

ence. When only one 702 is used on a separate amplifier,
set the 702 volume control to 10 and adjust the amplifier

or mixer controls as desired. When several 702s are used

on the same amplifier, set at least one 702 volume con­trol to 10 and adjust the others as necessary. Setting at

least one 702 to 10 will ensure maximum undistorted out-

put from the amplifier.

It is possible to optimize the 702 (maximum gain before
feedback, most natural sound, etc.), for various room con­ditions with an equalizer such as the Shure Model
Audio Equalizer. Optimum system sound may be ob­tained by "tuning" the equalizer with an equalization
analyzer system such as the Shure Model

Direct Amplifier Connection

The Speakers are designed to be used with power am­plifiers having the following maximum output capabilities:

However, sine-wave signals delivering 50 watts to a

Speaker should be avoided in that they present a much

60" angle to the

SR107

M615AS.

Checking Sound Coverage

When the Speakers, amplifier and other equipment
have been installed and connected, apply a fairly con­stant level signal to the system (preferably pink noise or

program material) and walk around the stage area. Listen

for a smooth, even output from the Speakers, with mini-

mal differences in volume and tone, and no unclear or
"dead" spots. A dead spot-for audio purposes, an area

where no sound is heard, or where the sound level is

appreciably lower-may mean that the Speakers are not
covering that area, or that the speaker wires are con­nected out-of-phase. Proper phasing may be readily
determined by checking the connections on each Speak­er, but inadequate coverage generally requires Speaker

repositioning or adding Speakers.

SERVICE

Speaker Servicing

1. Using an ohmmeter, measure the resistance be­tween the tip and sleeve of a phone plug inserted
in a speaker jack. The dc resistance should be 12
to 16 ohms with the volume control at 10.

2. To gain access to the individual speakers, remove
the Phillips head screws on the grille.

3. Using an ohmmeter, measure the resistance of each
speaker voice coil. A clicking sound will be made
by a "good" speaker when an ohmmeter is con-

nected or disconnected. Note that the resistance

of each

out disconnecting a lead from one of its terminals.
Each 8-inch speaker should measure between 7.5
and 9.5 ohms. The piezoelectric tweeters are capac­itive and cannot be measured with an ohmmeter;

the capacitive value of each tweeter should be

between

INSTRUCTIONS

&inch speaker cannot be measured with-

.ll

and .I7 mF.

4. If the above tests do not locate the problem unit, 5. After servicing, replace the grille and tighten all
apply a small ac voltage from an oscillator and hardware to avoid rattles.
aipiifier to each speaker individually (approximate-

ly 4V, 50 Hz to 5 kHz for 8-inch speakers; approxi­mately 2V, 3 kHz to 15 kHz for piezoelectric
tweeters). As the test signal frequency is varied, any
erratic buzzes or rattles indicate possible failure.

WARNING

Sound pressure levels generated by this test may
be damaging to your hearing. Aim speakers away
from listeners and toward sound-absorbent ma­terial (curtains, blanket, etc.). Carefully adjust
test signal amplitude to avoid unnecessarily high
sound pressure levels for prolonged periods.

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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 con-

sequential 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.

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REPLACEMENT PARTS LIST

Reference

Designation

J1-J2

LSI-LS2
LS3-LS5

MPI

M P2
M P3
M P4
M P5
M P6
M P7
M P8
M

P9
MP10
MP11
MP12
MP13

MP14

R

1

R2

Replacement

Kit No.

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RKCI 54
RKCI 55

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RKCI 50

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Qty.

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1
1

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1

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R

80-

1

RED

A

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CIRCUIT DIAGRAM

FIGURE

Part No.

90BA2600
80A348
80A343
60A64

80A347
94A1312A
66A158
488064
48C064
53A1656B
31 A1 340
53A1626
39A464
39A463
30N893B
30H988B

30A1087A
90BG2600
45CC220D

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3

Replacement Kit Consists Of:

Description

Connector, Phone Jack, 2-Conductor, Open Circuit
8-inch Loudspeaker
Piezoelectric Tweeter

Speaker Enclosure Assembly (including Handle, Corner

Protectors; without Speakers, Tweeters, Grille, Connect­or Plate Assembly, Caution Plate, Feet)
Grille
Retractile Handle Assembly

Foot
Chrome Trim Strip, Horizontal
Chrome Trim Strip, Vertical

Corner Protector
Volume Control Knob
Connector Plate (without connectors or volume control)
Caution Plate

Nameplate
Phillips Pan Head Machine Screw, #8-32,
Phillips Round Head Machine Screw, #8-32, (Feet)
Threaded Nail,
Rheostat, 80 ohms
Resistor, Wirewound, 22 ohms,

Ti"

(Corner Protectors)

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BLACK

1353-1 1-2

lo%, 2W

1%'' (Grille)

Parts listed as RKC Kits should be ordered by that kit number. Any orders received for piece parts where RKC Kit number is
shown will be shipped in RKC quantities.