Shure 711 User Guide

222 HARTREY AVE.. EVANSTON. IL. 60204 U.S.A.
D
I
@r
MICROPHONES
AREA
CODE 312/866-2200 CABLE:
TWX: 910-231-0048 TELEX: 72-4381
COMPONENTS
SHUREMICRO
1
DATA
SHEET
1
MODEL
711
LOUDSPEAKER SYSTEM
VARADTM AND SIT EQUIPPED
I
OPERATION AND SERVICE INSTRUCTIONS
DESCRIPTION
The Model 71 1 Professional Loudspeaker System
consists of an all-new Shure-designed and
-manufactured 15-inch a Shure-designed and -manufactured high-power high­frequency driver, and a unique dispersion horn with sliding vanes to set 60°, 90° Left, 90° Right, or 120° coverage angles. The Model 711 Speakers can be used individually or in combination to
provide high-SPL sound reinforcement of wide frequen-
cy range program material in any shape or size of
room-from the most intimate club to the largest
auditorium.
The 711 system has a frequency response of 56 to
14,000 Hz and an impedance of 8 ohms. The system is
designed to operate with amplifiers capable of deliver-
ing up to 150 watts continuous to an range operation and up to 200 watts low-frequency when biamplified. The 711
that automatically converts to biamplif ied operation. In
addition, two low-frequency parallel-wired to permit cascading speakers as well as connecting each speaker to a separate amplifier output.
The 711 has built-in passive low-frequency and high­frequency crossover networks for optimum acoustic matching and speaker protection. overload protection circuit safeguards the high­frequency driver against damage from unusually high-
level signals.
The speaker system is housed in a front-vented Thiele-Small aligned bass reflex cabinet constructed of
(5/s
15.9 mm
resistant black vinyl, with steel corner protectors and durable plastic feet. A handsome metal grille that pro­tects the woofer can be easily removed or permanently attached (see page 2). The 71 1 weighs 30 kg (66 Ib) and can be carried by grasping it at the top and sides of the cabinet corners. Proper lifting techniques should be observed when handling equipment of this size and weight.
A heavy-duty 15m (50 ft), 18-gauge, rubber-jacketed connecting cable with phone plugs is supplied with the speaker. A rugged vinyl slip-on protective cover with a
Copyright
27A8006(AH)
1981,
in.) plywood, covered in strong, scuff-
Shure Brothers
Shure Music Transducer
VARADTM variable-
&ohm load for full-
features a switching jack
andlor full-range jacks are
In
Inc.
woofer,
addition, an
cable pocket is available as Model A711C.
SPECIFICATIONS
Power Rating
Maximum recommended amplifier output to 8 ohms:
Full Range: 150 watts continuous, 34.6 Vrms, 55V peak;
Biamplified-Low Frequency: 200 watts continuous, 40 Vrms, continuous, 34.6 Vrms, 55V peak.
Frequency Response
56 to 14 kHz k5 dB (see Figure 1)
TYPICAL
Impedance
8 ohms rated (see Figure 2)
Crossover Frequency
2 kHz; low frequency: 12 dBloctave;
63.5V peak; High Frequency: 150 watts
'/3
OCTAVE FREQUENCY RESPONSE
(HORN SET AT
FIGURE
FREOUENN
TYPICAL IMPEDANCE
FIGURE
high frequency: 18 dBloctave
120')
1
IN
HERTZ
2
Printed
in
U.S.A.
Sound Pressure Level
101 dB at
1m with 1W input (2.83V)
Phasing (polarity)
Positive voltage on phone jack tip produces positive sound pressure (woofer cone moves out)
High Frequency Section
120°, 90°L, 90°R, or 60° (selectable) radial horn; High-power driver,
1 %-inch voice coil
Low Frequency Section
15-inch SMT woofer,
2lh-inch voice coil
Horizontal Distribution
120°, 90°, or 60° (see Figure 3)
HORN
----
-
.......
0
2 kHz
4
kHz
8
kHz
Connectors
Two parallel-wired phone jacks for full-range opera­tion, or low frequency only in biamp mode; One switching jack for high-frequency input in biamp mode
Cable
15m (50 ft) 18-gauge, rubber jacketed with phone plugs
Overall Dimensions (including feet)
702
mm H x584 mm W x 402 mm D(27% in. x23 in. x
1513/16 in.)
Weight
30 kg (66 Ib)
Construction
mm
(%
15.9
in.) plywood, black vinyl covering, black
steel grille, steel corner protectors, plastic feet
INSTALLATION
General
Maximum coverage for source-oriented installations is generally obtained with the speakers on both sides of the sound source and as far forward as possible. Each speaker is tilted slightly either downward (for wall- or ceiling- mounted units) or upward (for floor-standing units). The angle of tilt (assuming a single speaker to each side of the sound source) should be such that you can look into the throat of the horn from the last rows of
the audience area covered by the speaker.
If it is desirable to elevate the 711, adequate support for heights up to about one meter (three feet) can usual­ly be obtained using a sturdy table or bench. The sur­face must be capable of supporting the 30 kg (66 Ib)
weight of the speaker. For greater elevations, it is im-
portant to note that the 711 is not designed for moun-
ting by simple chains or cables attached to the cabinet top or sides. If the speaker is to be supported by chains or cables, encircle or cradle it.
90DR
6O'HORN
.....
-
.......
2
kHz
4
kHz
8
kHz
..--
-
......
HORN
2
4
8
kHz
kHz
kHz
TYPICAL POLAR PATTERNS
FIGURE
3
Vertical Distribution
60°
Directivity Factor Re
(Q)
500 Hz: 5.2 1 kHz: 7.1
HORN ANGLE
120° 90° 60°
---
2 kHz: 6.6 7.3 15.3 4 kHz:
10.3 16.7
21.6
Environmental
Operating Temperature: -7 to
43OC (20 to llO°F)
Storage Temperature: -29 to 71°C (-20 to 160°F)
WARNING
It is extremely important that both the mounting surface and the mounting hardware are adequate to support the weight of the speaker. support may result in a hazardous operating con­dition. Whatever mounting means are employed, support should be provided for a speaker static load of 120 kg (264 Ib). Actual weight of the speaker is 30 kg (66 Ib).
If the speaker is elevated and tilted down, it is desirable to attach the grille permanently. Do this by driving screws or nails through the grille frame into the cabinet, or through the sides of the cabinet into the grille frame.
Coverage Angles
The 71 1 Speaker System features a unique horn with sliding vanes to set variable horizontal dispersion pat­terns. The
120°, 90° Right, 90° Left, or 60° angle choices provide unprecedented flexibility, making the 711 the one ideal speaker in a variety of circumstances that previously required separate kinds of units to en­sure adequate coverage.
Inadequate
Adjust the angle by sliding the vane all the way out or all the way in. With both vanes out, the speaker is set for 120°; with both vanes in, for 60°; with the right vane in,
90° left; and with the left vane in, for 90° right. (To
for narrow the angle, slide the vane in; to widen it, slide the vane out.)
Setting the horn at
60° concentrates the high-
frequency energy in an area one half that of a 120° horn.
3
This concentration produces an approximately
dB in­crease in the high-end response for "long throw" ap­plications. The extra high-end energy is extremely useful in providing maximum intelligibility for speech and singing voices, or in penetrating where acoustics are "dead" or where singers' voices must compete with loud amplified instruments on stage.
Use the in "short throw" applications. Use the "off center" or
120° angle for coverage of short, broad areas,
90° angles for
'I"-shaped applications. The 60° and 90° positions are also extremely useful when several speakers are employed to cover individual sectors of a very large hall or outdoor stadium.
Figure 4 illustrates the coverage angles, areas, and
sound pressure levels of the
VARADTM horn in the 711
Speaker System.
HORN 120'
1'01$,"'1
HOOKUP
Amplifiers
The 71 1 is designed for use with the Shure Models 700 or 706 Power Consoles and similar amplifiers hav­ing the following maximum power output capabilities.
Speaker Wiring
Fifteen meters (50 ft) of cable is supplied with each 711 Speaker System. For convenient attachment, a straight phone plug and a right-angle phone plug are provided. Connect either end to the back of the speaker and to the Power Console amplifier. The supplied cable is 18 gauge (No. 18 AWG) and can be used for cable runs of up to 15m (50 ft) between the speaker and the amplifier. If cable runs longer than use the following table to determine the correct wire gauge.
Maximum Distance From
Power Console
Amplifier Wire Gauge Recommended Cables
15m are required,
HIGH-FREQUENCY COVERAGE: ON-AXIS SPL
INCREASES AS ANGLE DECREASES
COVERAGE ANGLES
FIGURE
4
If two speakers are stacked for source-oriented in­stallations, horn-to-horn mounting with horns angled apart to cover separate areas will provide the best sound dispersion pattern. For stacked and splayed speakers, the
Judicious speakerlmicrophone placement
60° horn angle is recommended.
andlor the use of equalization or feedback filters in the sound system will often relieve acoustic feedback. In addition, narrowing the horizontal dispersion angle from
120° to 90° or 60° can be effective in remedying high-frequency feedback conditions, when, for instance, speakers on stage have dispersion patterns that overlap the pickup areas of open microphones.
15m (50 ft) AWG 18 Belden
#8460, #8461,
#9470, #8542
30m (1 00 ft) AWG 16 Belden #8470, #8471,
#8472
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 Low
FrequencylFull Range jacks are provided on the back of each 711 Speaker System. This allows connecting two speakers by connecting the first speaker to the amplifier and the second speaker to the first. This may be helpful in cer­tain room shapes. However, when speakers are con­nected in this manner, the next heavier wire gauge is recommended between the amplifier and the first speaker. Therefore, for two speakers connected together where the first is at a distance of 30m (100 ft) from the amplifier, use No. 14 AWG cable between the amplifier and the first speaker; for two speakers where the first is at 15m (50 ft), use No. 16 AWG cable between the amplifier and the first speaker. When positioning the speaker cables, place them where the audience, per­formers, or passers-by will not trip over them.
To avoid frequency 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 in the chart above are color-coded to ensure 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 cable can be stored in the convenient snap-
pocket of the optional slip-on cover for the 711 speaker.
25-Volt Line Operation
The 711 can be operated from a 25-volt line without the need for an accessory transformer. Note that the speaker will draw 78 watts when connected to a constant-voltage, 25-volt line.
70-Volt Line Operation
For operation from a 70-volt line, a transformer such
as the Shure Model
A102A, providing power taps of 50,
25, 12, and 6 watts, should be used.
CHECKING SOUND COVERAGE
After the 711 speakers, Power Console amplifiers, and other equipment have been installed and con­nected, sound coverage can be checked as follows.
1. Apply a fairly constant-level signal to the system
(preferably low-level pink noise* or program material) and walk around the audience area. Listen for a smooth, even output from the speakers, with minimal differences in volume and tone, and no "dead" spots or phase distortion.
-
A. A dead spot
sound is heard, or where the sound level is ap­preciably not covering that area, or that the speaker wires are connected out-of-phase. Proper phasing can be readily determined by checking the connec­tions on each speaker, but inadequate coverage generally requires repositioning the speakers. The dead area should be examined carefully to determine that the problem can be corrected without resorting to auxiliary speakers.
B.
Phase distortion - a type of distortion distin­guishable by being heard only in parts of the au­dience area-can be due to overlapping areas of speaker coverage or sound reflecting off hard sur­faces. Re-aim the speakers or change the horn angle to kind of distortion.
2. Use an Equaiization Analyzer System such as the
for audio purposes, where no direct
lower- may mean that the speakers are
60° or
90°
from 120° to eliminate this
Shure Model
M615AS to supply and analyze a pink noise signal. An octave equalizer like the ones found on the Shure Models 700 or 706 PRO
MASTERTM Power Consoles (or separate equalizers like the Shure Models
SR107 or M610) can be used to adjust the sound system for optimum equalization and max­imum gain before feedback.
General
The 711 is designed for automatic biamplification
when an amplifier is connected to the high-frequency in-
put switching jack. Using this jack disconnects the high-frequency driver and crossover from the
low­frequency woofer and crossover. Separate power amplifiers are then required for individual connection to the high- and low-frequency speaker sections.
The advantage of biamplification is the elimination of high-frequency and intermodulation distortion caused by high-level low-frequency signals. The separate power
amplifiers used in biamplifying reduce these distortions and increase the acoustic output.
Biamp Connections
When the 711 is biamplified, the low-frequency sec-
tion is designed to operate with an amplifier capable of delivering up to 200 watts continuous (40 Vrms,
63.5V peak) to an &ohm load; and the high-frequency section is designed to operate with an amplifier capable of
delivering up to 150 watts continuous (34.6 Vrms,
55V peak) to an &ohm load. To biamplify, an active crossover is required to separate the high and low fre­quencies. Set the crossover frequency at 2 kHz, and connect the crossover high- and low-frequency outputs
B
to separate amplifiers, such as the A and
Power Amps of the Shure Model 700 Power Console. Connect the speaker output from the low-frequency amplifier to one of the jacks marked "Low
FrequencylFull Range", and connect the speaker output from the high-frequency amplifier to the jack marked "High Frequency".
GUARANTEE
See enclosed sheet for your Shure Guarantee.
*sine-wave signals delivering
because they present a much greater average power than does pink noise or program material. Consequently, when setting up or adjusting a sound system with the test signals.
711
150
watts to a speaker should be avoided
speaker, avoid the use of high-level, continuous-type
REPLACEMENT PARTS LIST
DESIGNATION
A1 A2 A3 A4 Cl C2 C3
J1, J2
J3 L1
L2 LS1 LS2
M
PI M P2 M P3 M P4 M
P5
M P6 M P7
PL1, PL2
R1, R2
W1
KIT NO.'
RKC166 RKC157
RKC168
R KC4
QTY.
1 1
1
1
PART NO.
90A8037 90A8053 9083033 90A2636 50H71 50J71 50K71 95Y446 952446 95A8006 95A8021 90A8042 9082650 90A8047 65A999A
53A1563D 53A 1 656C 65A8012A
90A8036 9088036 95A932A 45EC508G 90C1373
DESCRIPTION
High-Frequency Crossover Network (includes L1) Low-Frequency Crossover Network (less L2)
&
Coil
PL1, PL2)
Overload Protection Kit (includes High-Frequency Diaphragm Capacitor, Mylar, 8.0
pF, lo%, 250 WVdc*" Capacitor, Mylar, 25.0 pF, lo%, 200 WVdc** Capacitor, Mylar, 15.0 pF, lo%, 200 WVdc" Connector, Phone Jack, 2-Conductor, Open Circuit Connector, Phone Jack, Switching Type, 2-Conductor, Closed Circuit Inductor, 0.4 Inductor, 1.2
mH, 0.40
mH, 0.20 15-inch SMT Woofer High-Frequency Driver (includes A3, A4) Grille Foot, Plastic Corner Protector, Front Corner Protector, Rear Molded Horn, Top or Bottom Section (Order 2 for complete molded horn) Slider Vane, Left Slider Vane, Right Lamp, Automotive 1156 Resistor, 54 Cable,
22W, 10%
15.2m (50 ft) with Phone Plugs
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.
"
Selected for low dissipation factor.
CROSSOVER NETWORKS
BLACK
LOW
FREWENCY/
FULL
RANGE
H16H
FREQUENCY
BLACK
-...
BLUE
\
\
- - - - - -
RED
GRAY
-
I
LS
1
CIRCUIT
FIGURE
DIAGRAM
5
SERVICE
Diagnosing the Problem
1.
Disconnect the speaker cables.
2.
Using an ohmmeter, measu.re the resistance between the tip and sleeve of either Low Range phone jack. The dc resistance should be 5 to ohms. A clicking sound will usually be made by a "good" woofer when an ohmmeter is connected or disconnected (although a digital multimeter may not produce a click).
NOTE: This test checks only the woofer and the series inductor in the low-frequency crossover net­work.
3.
For access to the high-frequency driver, crossover network, and protection circuit, proceed as follows.
NOTE: This is most easily done by supporting the cabinet on its back with the head of the large bolt in the upper center of the cabinet back hanging over the edge of the bench.
A. Unscrew and remove the
B. Pull the horn and driver out of the cabinet. Free it
4.
Using an ohmmeter, measure the resistance between the driver terminals and across the terminals of each
lamp in the protection circuit. The dc resistance of the driver should be may be made by a "good" driver as described in step
2
above. The dc resistance of a cold lamp should be
approximately 0.4 ohms.
5. If the above tests do not locate the problem, apply a small ac voltage from an oscillator and amplifier to each speaker individually. Use approximately
Hz to
Hz to 15 kHz for the high-frequency driver. As the test signal frequency is varied, any erratic buzzes or rat­tles indicate possible problems.
INSTRUCTIONS
FrequencylFull
8/,,
in. hexhead bolt from
the upper center of the cabinet back.
from the cabinet by disconnecting from the crossover the red and gray leads that go to the jack panel.
5
to 7 ohms; a clicking sound
4V,
50
3
kHz for the woofer, and approximately
2V,
500
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.
6. To reassemble the horn and driver, connect the jack panel leads (see Figure 5): red lead to the crossover terminal with a red lead on it (center terminal of three in a row); gray lead to the terminal with a gray lead on it (outside terminal [toward the mouth of the horn] of three
in
a row).
7
7.
With the crossover facing the top of the cabinet, replace the driver and horn by inserting it in the cabinet and firmly tightening the bolt.
Replacing the 1Binch Woofer or Gaining Access to the Jack Panel and Low-Frequency Crossover
1.
Remove the grille by pulling the tabs.
2.
Supporting the cabinet on its back, remove the eight screws that hold the woofer in place.
3.
Pull the woofer upward out of the cabinet and discon­nect the red and black leads from the woofer ter­minals. The woofer is now free from the cabinet and can be lifted out and removed. Take care not to damage the cone nor to break the leads when doing this.
4.
Before replacing the woofer, connect the leads: red
lead to the red coded terminal.
5. Insert the woofer in the cabinet and tighten the eight previously removed screws.
6. Press the grille back in place.
Replacing the High-Frequency Driver
1. Remove the horn and driver as described in step 3 of the section
2.
At the crossover, disconnect the white and gray
leads that come from the driver, and the red leads that come from the overload protection lamps.
3.
Unscrew the driver from the back of the horn. NOTE: The diaphragm and coil
overload protection lamps Instructions for replacement are enclosed with the replacement part kit.
4. When reassembling, screw the driver to the back of
the horn. Tighten the driver by hand. Do not use a wrench or other tools.
5.
Connect the white and gray driver leads to the crossover (see Figure 5): white lead to the inner ter­minal of three in a row (toward the throat of the horn); gray lead to the outside terminal of three in a row (toward the mouth of the horn). Connect one red lamp lead to the empty terminal and the other red lamp lead to the single terminal closest to the throat of the horn.
6. Replace in the cabinet as described in steps 6 and 7
of
Diagnosing the Problem.
Diagnosing the Problem.
(RKC157) and the
(RKC166) can be replaced.
SOUND OF
THE
PROFESSIONALS@
Loading...