Shure SR102 Training manual

222 HARTREY AVE.. EVANSTON, IL. 60204 U.S.A.
I
DATA MODEL SR102 AND SR103
AREA CODE3121866-2200 . CABLE: SHUREMICRO
SHEET SPEAKER COLUMNS
TWX: 910.231-0048 TELEX: 72-4381 I
OPERATION AND SERVICE INSTRUCTIONS
FIGURE A. SR102 SPEAKER COLUMN
DESCRIPTION
The Shure Model SR102 and SR103 Speaker Col-
umns are speaker systems designed for use with
Shure Model SR105 or similar high-power amplifiers
in sound reinforcement applications. When properly
installed and connected, the SR102 and SR103 Col-
umns will provide outstanding performance. Their wide
frequency range, distortion-free reproduction and high
sound penetration power make them a valuable asset
to any sound reinforcement system. The Columns may
be used with either direct
(4- lo 16-ohm) or constant-
voltage 25- or 70-volt amplifier outputs.
Quality sound reproduction is achieved through the
use of two 10-inch and four binch heavy-duty speak-
ers, plus two high-frequency speakers which combine
the functions of dome radiators and acoustic horn
radiators. The tuned-rear-port enclosure design con-
tributes to the highly directional pattern, which is
critical in achieving maximum audience penetration
and feedback reduction. The inductive-capacitive di-
viding networks maintain frequency-selective distribu-
tion of signals to the proper speakers.
The
SR102 Column is a portable unit (see Figure
FIGURE B. SR103 SPEAKER COLUMN
A), and is primarily designed for temporary installation
either indoors or in a protected outdoor environment,
such as under an open pavilion. The Column may be
operated vertically on its own feet, or in a tilted posi-
tion using an optional easel-type tubular stand (Shure
A3S-T). The SR102 Column is supplied with a 15m
(50-foot), 18-gauge, rubber-jacketed connecting cable
with locking phone plugs. The lower rear section
of the
Column contains a cable storage compartment. The
SR102 Column is covered with a tough vinyl surface,
front and rear metal grilles are finished in durable
black enamel, and trim is anodized to minimize visible
wear. A retractile handle and balanced design con-
tribute to ease of transporting.
The
SR103 Column (see Figure B) is a weather-
resistant unit, and is primarily designed for permanent
installation either indoors or in a protected outdoor
environment such as under the roof of an open pavil-
ion. Electrical components, hardware and enclosure
surfaces have been designed to maximize resistance
to adverse weather, with drain holes provided to min-
imize moisture accumulation. Adhesives used in the
SR103 Column are moisture-resistant and trim and
fastening hardware have a high corrosion resistance.
Copyright 1980, Shure Brothers Inc.
27A897 (TC)
Printed in U.S.A.

SPECIFICATIONS
Power Rating (Program Material)
Power Load for Constant-Voltage
Operation
Impedance
Frequency Response
Crossover Frequency
Sound Pressure Level (SPL)
Phasing (Polarity)
Horizontal Distribution
Vertical Distribution
Environmental Resistance:
Operating Temperature
Storage Temperature
Humidity
Connectors
Mounting Hardware Supplied
Overall Dimensions
(See Figures
E and F)
Weight
Construction
SR102 SR103
---
100 watts max. (40-volt input, 16 ohms or
80-volt input, 64 ohms)
39 watts (25-volt input, 16 ohms)
78 watts (70.7-volt operation, 64 ohms)
16 ohms nominal (25-volt strapping)
64 ohms nominal (70.7-volt strapping)
100 Hz
- 15 kHz (See Frequency Response,
Figure
C)
5 kHz
EIA rating: 53 dB at 9.2m (30 ft) from 1 milliwatt;
equivalent to 101 dB at 1.2117(4 ft) with 1-watt input.
Positive voltage on plus
(+) terminal or phone jack
tip (SR102 only) produces positive sound pressure.
140" (See Polar Response, Figure D)
65"
-6.7" to 43°C (20" to 110°F)
-29" to 71°C (-20" to 160°F)
Normal indoor/outdoor
One 6-screw terminal
strip; two parallel-wired
phone jacks
None
1522 mm height (incl. feet)
x 354 mm width x 241 mm
depth (59-15/16 in.
X 13-
15/16 in. X 9% in.)
32.62 kg (72 Ib)
incl. cable
19 mm
(3! in.) wood, black
vinyl covering, black
metal grilles, anodized
aluminum trim strips.
Moisture-resistant
One 6-screw terminal
strip
5/16-18 x 1
Y2" screws
1513 mm heightX352 mm
width
x 240 mm depth
(59-9/16 in.
X 13% in.
x 9-7/16 in.)
31.8 kg (70 Ib)
19 mm
(Y4 in.) wood, black
vinyl covering, black
metal grilles, anodized
aluminum trim strips.
All surfaces (internal
and external) and all
components treated for
weather resistance.

SPECIFICATIONS (CONT'D)
* Do not use Shure A3S-S Tilt Stand; this stand will not fit the SR102 Column.
SR103
-
A102A 70-Volt
Transformer
A103A Wall Mount
Speaker Column
Bracket
Supplied Accessories
Optional Accessories
-
FREQUENCY (Hz)
SR102
One 15m (50-foot)
heavy-duty cable with
locking phone plugs
A102A 70-Volt
Transformer
A3S-T Speaker Tilt
Stand*
A50XC 15m (50-foot)
Extension Cable
with male and female
phone plugs
/
-2 0
/
FIGURE C. TYPICAL FREQUENCY RESPONSE
ANECHOIC RESPONSE
------
TYPICAL BASS RESPONSE RISE
DUE TQ ROOM REVERBERATION
INSTALLATION
-3 0
60 8'0 100 200 400 600 IK ZK 4K 6K 8K IOK 20K
General
In planning a sound system using the SR102 or
SR103 Columns, care must be taken to observe the
horizontal (1400) and vertical (65O) sound distribution
of the Columns. Maximum coverage for source-oriented
installations is generally obtained with Columns on
each side of the sound source and as far forward
as possible, with each Column tilted slightly either
downward (for wall- or ceiling-mounted Columns) or
upward (for free-standing Columns). The angle of tilt
(assuming a single Column to either side of the sound
source) should be such that an imaginary line from
the center axis of the Column runs to the back row
of the audience area. The SR102 Column is designed
to accept the Shure A3S-T tilt stand, which provides
a maximum tilt angle of 30 degrees. For "clustered"
Column installations covering a wide area, each Col-
umn should be positioned so that its angle of coverage
coincides with that of the Column next to it as their
sound output enters the audience area.
When used for distributed-speaker systems, the
Columns are generally mounted at equidistant intervals
over the area to be covered. Wall- or ceiling-mounting
LEGEND
- 250 Hz
FIGURE D. TYPICAL POLAR RESPONSE
is usually employed, although free-standing Columns
raised several feet or more from the floor are used
quite satisfactorily.
The problem of audience penetration may be likened
to illuminating a dark area with a floodlight: the object
is to provide maximum area coverage (audience) with
the available floodlights (columns). At the same time,
care must be taken to avoid illuminating reflective
surfaces. A blinding reflection (reverberation or
echoes) may be more of a problem than inadequate
coverage of the desired area.
Of the remaining common sound installation prob-
lems, acoustic feedback can usually be dealt with by
judicious Column/microphone placement, and/or the
use of feedback filters on the audio console. Back-
ground noise or acoustic absorption conditions gen-
erally require a greater volume level to maintain the
proper audio level. However, it must be remembered
that excessive volume may be intolerable to that part
of the audience nearest the Columns. In this case, or
in those cases where the architectural design leaves
audience areas that are not reached by the Columns,
the use of secondary or auxiliary speaker systems
should be considered. If these are used, the coincident
considerations of delay and phasing must also be
faced.
3

b.5 mm (3/8 IN.)
FIGURE E. SR102 COLUMN OVERALL DIMENSIONS
Direct Output Strapping
To connect the SR102 or SR103 Columns for use
with direct (4- to 16-ohm) amplifier outputs or stand-
ard constant-voltage, 25-volt lines, proceed as follows.
The SR102 Column rear panel contains a terminal
strip with six terminals (numbering, from left to right:
-, 4, 3, 2, 1, +) and two parallel-wired phone jacks
(see Figure G). The phone jacks are wired to corres-
pond with the strapping of the terminal strip. Posi-
tive and negative inputs are located at either end
terminal as marked. Note that the SR103 Column rear
panel is identical except that it does not have phone
jacks.
Make sure the two straps connecting terminal
1 to
terminal 2 and terminal 3 to terminal 4 are in place.
This provides a total Column impedance of 16 ohms
(parallel internal wiring) with a power rating of 100
watts when operated from a 40-volt amplifier output.
When connected to a constant-voltage, 25-volt line
without a transformer, the Column will draw
39 watts.
The Column may also be connected in a "split"
configuration, either to provide redundancy-in case
of amplifier or speaker failure, the total Column output
will not be lost-or to provide for separate inputs
from different sources, for instance, from both paging
and background music systems. This is accomplished
by removing the strapping between terminals 2 and
3,
and connecting one input to the plus (+) and 3 termi-
nals, and the other input to the minus
(-) and 2 termi-
nals (see Figure G). The impedance for each half of the
Column with this configuration is 32 ohms, and the
power rating is 50 watts. When connected to a 25-volt
line (without a transformer), the power drawn by each
4
half of the Column is 20 watts.
119 mm
(4-11/16 IN.)
I L~~~~. SCREW 5/16-18 X 1-1/2
a FLAT WASHER (12 PLACES)
FIGURE F. SR103 COLUMN OVERALL DIMENSIONS
The Columns are designed to accept program ma-
terial resulting in power peaks up to 100 watts on a
continuous basis. However, sine-wave signals deliver-
ing 100 watts to a Column 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 Columns, avoid
the use of high-level, continuous-type test signals.
To insure safe operation of the Columns with pro-
gram material inputs, do not connect them to an am-
plifier with an output capability greater than the fol-
lowing:
1 Continuous Power To: I
Voltage
Connection
(Direct Output)
SPEAKER COLUMN MODEL 511102
PAP FOR 70 VOLT LINE 64 OHMS 78 WATTS
FIGURE G. SR102 COLUMN REAR PANEL

AMPLIFER-TO-SPEAKER DISTANCE (PEETI
70-Volt Output Strapping
For 70-volt (series) operation, remove the two straps
and insert one strap between terminals 2 and 3 only.
-
(Retain the extra strap for possible future use.) This
connection provides a total Column impedance of
8
Y
64 ohms and a power rating of 100 watts when oper-
ated from a constant-voltage, 70.7-volt line. Note that
#
D
this strapping allows the Column to be used directly
L!
on a 70-volt line without a transformer. The power
2
S
drawn from the 70-volt line is 78 watts. For operation
rn
from a 70-volt line at lower power levels, a transformer
I
s
such as the Shure Model A102A provides power taps
V)
of 50, 25, 12.5 and 6 watts.
Column Wiring
The cables used to connect the Columns should be
at least 18-gauge and rubber-jacketed. Determine the
approximate distance from amplifier to Column and
AMPLIFIER-TO-SPEAKER DISTANCE (METERS1
refer to Figures H or J to find the proper wire gauge
for direct output or 70-volt output operation. Recom-
FIGURE H. RECOMMENDED WIRE GAUGE:
mended cables for the sizes listed in Figures H and
DIRECT OUTPUT
J are: When wiring the Columns, consideration should be
l8 Gauge:
#84607 #84619 #97401 #8452
given to positioning of the cables. While most local
16 Gauge: Belden #8470, #8471, #8472 electrical codes do not require locatingspeaker cables
14 Gauge: Belden #8473 in conduits or raceways, make sure that cable place-
12 Gauge: Belden #8477 ment minimizes traffic interference and physical abuse
To avoid the frequency losses, poor coverage, dead
zones, etc., resulting from improper speaker phasing,
the Columns must be wired in proper polarity. The
cables listed above are color-coded to ensure that
identical connections are used for each amplifier-
Column hookup. Note that even common 18-gauge
lamp cord ("zip cord") is phased-coded with ribs along
the outer jacket of one conductor.
When using the 15m (50-foot), heavy-duty cable
supplied with the SR102 Column, connect the right-
angle plug to a Column phone jack and twist the cable
downward behind the locking bar to prevent accidental
disconnection. The other phone jack and the terminal
strip may be used for additional, parallel-connected
Columns. When not in use, the cable may be stored
in the compartment below the connector panel.
AMPLI FIER-TO-
to the cable.
SR102 Column Installation
The SR102 may be operated free-standing, or on an
optional tilt stand (Shure ASS-T). In positioning the
Columns for optimum sound coverage, care must be
taken to locate the Columns on stable surfaces and
away from areas where the movement of performers,
audience, curtains or stage sets may cause it to topple
over. Consideration must also be given to heavy air
currents, whether naturally caused by wind outd'oors
or in an open pavilion, or generated indoors by fans
or air conditioners. If the above conditions cannot be
avoided, the Columns should be secured with rope,
cable or strapping to maintain their physical position
and prevent accidents.
SPEAKER DISTANCE
(FEET
AMPLIFIER-TO-SPEAKER DISTANCE (METERS)
FIGURE J.
RECOMMENDED WIRE GAUGE: 70-VOLT OUTPUT