Specifications
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 locating speaker 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