Shure Pro Master 703 User Guide

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DESCRIPTION

The Shure Model 703 PRO MASTERTM is a compact, rugged, heavy-duty, two-way loudspeaker system with a high-frequency horn. The unit is designed for highpower, localized sound coverage in on-stage monitor (foldback) applications. The 703 is recommended for use

with virtually any power amplifier capable of delivering

up to 100 watts to an 8-ohm load. The Speaker can be placed in either of two slanted positions facing the performer.

Two 8-inch heavy-duty speakers and a high-frequency

driver coupled to a 120" radial horn provide excellent sound reproduction. The 703 is supplied with two highfrequency focusing wedges which, when inserted in the radial horn, narrow the horn coverage from 120" to 60" and increase the high-frequency response by approximately 5 dB.

The 703 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 703 are equipped with steel protectors. Rubber feet on two surfaces provide protection and offer the option of positioning at either a

In addition to the high-frequency focusing wedges, the 703 is supplied with a rugged vinyl snap-on protective cover. jacketed connecting cable with phone plugs is available

as Shure Model

222 HARTREY AVE.. EVANSTON, IL. 60204 U.S.A.

MICROPHONES

AREA CODE 3121866-2200 . CABLE: SHUREMICRO TWX: 910- 231-0048 TELEX: 72-4381

AND

ELECTRONIC

COMPONENTS

OPERATION AND SERVICE MANUAL

in.) plywood and

30" or 60" angle to the stage.

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

RKC4.

MODEL

703

WGijilhlST@Lji3

STAGE MONITOR

SPEAKER SYSTEM

FREQUENCY IN HERTZ

TYPICAL IMPEDANCE CURVE

FIGURE

110

I05

I00

85 DISTANCE: 4 FT.

TYPICAL FREQUENCY RESPONSE

Crossover Frequency . .2600 Hz; high frequency: 18 dB1

High-Frequency

Section

Low-Frequency

Section

Horizontal Distribution

...........

FREOUENCY IN

FIGURE

.Radial horn and driver

.Two 8-inch speakers .12O0 or 60" (with wedges) (see

INTO

lpoo

HERTZ

octave rolloff; low frequency:

dB/octave rolloff

Figure 3)

SPECIFICATIONS

Power Rating

Impedance

Frequency Response

Sound Pressure

Level (SPL)

Phasing (Polarity)

1980,

(TH)

........

..........

.......

.....

Shure Brothers Inc.

.Maximum recommended ampli-

fier output: 100 watts continuous, 28 Vrms, 48V peak to 8 ohms

.8 ohms nominal (see Figure 1)

.I00 Hz - 16 kHz (see Figure 2),

optimized for natural widerange voice reproduction

.EIA rating:

from 1

98.5

I-watt input

Positive voltage on phone jack

tip produces positive sound

pressure

49.5

dB at

9.2m

milliwatt; equivalent to

dB at

(30 ft)

(3.3ft) with

LEGEND LEGEND

...........

TYPICAL POLAR PATTERNS

FIGURE

...........

-.-.-.

4000 Hz 4

000

8000Hz BOOOHz

without wedges with wedges

without wedges

with wedgns

Printed

U.S.A.

Vertical Distribution Directivity Factor

(Q)

. .

Environmental Resistance:

Operating

Temperature

Storage

Temperature Connectors Overall Dimensions

Weight Construction

Supplied Accessories Optional Accessory

. . . . . . .

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

. . . .

. .

.85" with wedges

80" without wedges

.7.9 at 1 kHz full octave measure-

ment

7.9 at 4 kHz with wedges

4.2 at 4 kHz without wedges

. . .

-7" to 43°C (20" to 110°F)

. . .

-29" to 71°C (-20" to 160°F)

.Two parallel-wired phone jacks

.283 mm H x 587 mm W x 438

mm D (11% in. 17% in.)

.14.3 kg (31 Ib 8 oz)

. . .

.15.9 mm

vinyl covering, black fabric grille, retractile handle, steel corner protectors, rubber feet

.Snap-on protective cover; high-

frequency focusing wedges

RKC4 15m (50 ft) cable with

phone plugs

in.) wood, black

23% in.

INSTALLATION

Position the 703 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 703 may be used at either a horizontal. The angle chosen should be that which pro-

vides the most direct line-of-sight to the performer and also provides minimal visual interference with the audience.

The 703 is supplied with two high-frequency focusing wedges. The wedges are used to select the horizontal dispersion angle. Insert the wedges in the horn as shown below. Without the wedges, the 120" horn

703

MODEL

angle is used for short, wide areas, in "short throw" applications. Inserting the wedges at each side of the horn reduces the dispersion angle to 60" for long, narrow areas, in "long throw" applications. The useful when several monitor speakers are used to cover different sectors of the stage, and in minimizing feedback when the Speaker overlaps the microphone pickup area.

sound energy in half the area, causing an increase of approximately 5 dB in the high-end response. This extra energy is useful in providing maximum vocal intelligibility and in penetrating difficult acoustic areas or where singers must compete with loud amplified instruments.

feedback, most natural sound, etc.), for various room con-

60" angle also concentrates the high-frequency

The

It is possible to optimize the 703 (maximum gain before

WITH WEDGES INSERTED IN HORN

FIGURE

30" or 60" angle to the

60" angle is also

ditions 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

M615AS.

HOOKUP

Amplifier

The 703 is designed to be used with power amplifiers

having the following maximum output capabilities:

28 Vrms

However, sine-wave signals delivering 100 watts to a Speaker should be avoided in that they present a much 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 Speaker and refer to the following table to find the proper wire gauge [the Shure Model RKC4 is a 15m (50 ft), 18-gauge cable with phone plugs at each end].

Maximum Cable Length Gauge Recommended Cables

15m (50 ft) AWG 18 Belden #8460, #8461, 30m (1 00 ft) AWG 16 Belden #8470, #8471, 60m (200 ft) AWG 14 Belden #8473

Preferably, each speaker should be connected to a separate amplifier output jack to minimize power losses in the cable. Two parallel-wired jacks are provided on the side of each 703. This allows connecting two speakers by connecting the first speaker to the amplifier and the second speaker to the first. However, when speakers are connected in this manner, the next heavier wire

gauge is required between the amplifier and the first speaker. Therefore, for two speakers connected together where the first is at a distance of amplifier, use No. 16 AWG cable between the amplifier and the first speaker.

To avoid the response aberrations, poor coverage and dead zones caused by improper speaker phasing in multiple Speaker installations, all Speakers must be wired with the same polarity. The cables listed above are coded to insure that identical connections are used. Note that even common 18-gauge is phase-coded with ribs along the outer jacket of one conductor.

When positioning the Speaker cables, place them where the audience, performer or passers-by will not trip over them.

Wire

#9470, #8542 #8472

15m (50 ft) from the

lamp cord ("zip cord")

SERVICE INSTRUCTIONS

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

5.5 to 7 ohms.

2. To gain access to the individual speakers, remove

the grille by pulling the two cloth tabs at the lower edge. Remove the screws securing the board and carefully lift the board outward. Take care not to stress the speaker wiring.

horn/baffle

SR107

color-

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