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If OVERLOAD Indicator is flashing brightly or on
constantly, operating level is too high and will cause
distortion, and may result in less than full power
output from the sound system.
11. Set EQUALIZER Switch to IN position. Adjust Filter
Controls for particular equalization objective. See
procedures for feedback control, and playback and
live performance equalization in following sections.
While
adjusting
Equalizer
Filter Controls,
use
LEVEL Control to maintain desired volume in room.
Do not attempt equalization beyond bandwidth
limits of sound system. For best results, keep
number of Filter Controls used to a minimum, and
adjust each control no more than required.
12. After equalization, perform listening check of audi-
ence area to be sure that sound quality is satis-
factory throughout room.
Mounting and Ventilation
The SR107 Audio Equalizer is designed for rack-mount-
ing in a 483 mm (standard 19 in.) audio equipment rack
and is supplied with the necessary mounting hardware
(see Figure 3).
The SR107 may also be operated while mounted in a
Shure A30A or A105A Carrying Case. The A30A has a
panel height capacity of 88.9 mm (3% in.) for two SR107s
or one SR107 and one other unit of 44.4 mm (1% in.)
height. The A105A has a panel height of 178 mm (7 in.)
and will accommodate up to four units with panel heights
equal to that of the SR107.
No special precautions are required for ventilation. The
SR107 may be operated over a temperature range of
-
7"
to 57°C (20" to 135°F) in continuous duty without
derating.
Power Supply
The SR107 is furnished with a three-conductor power
cable and three-prong grounded plug (15). Connect the
SR107 to an outlet which supplies 108 to 132 volts ac,
50/60 Hz power. The maximum power consumption at
120 volts under normal operating conditions is 6 watts
(0.05 amperes at 120 volts). If extension cords are re-
quired, a high-quality, 18 gauge or larger cord should
be used.
r
1 8 - 9 / 1 6 IN]
197
mm'
1 7 - 3 1 4 IN)
4 8 3
mrn
I
I9
IN]-
4 4 3 rnm 117 7/16 IN
I
1
- -
I
4
4 4
mm
11-314 IN)
"NOT INCLUDING CABLE/CONNECTOR CLEARIWCE DEPTH
FIGURE 3.
OVERALL DIMENSIONS
The SR107-2E is furnished with a three-conductor de-
tachable line cord without a power plug. Obtain a suitable
3-pin male power plug and attach it to the line cord. The
plug should be installed by qualified service personnel.
(Brown lead goes to "hot" or "live" terminal, blue lead
to neutral terminal, and green/yellow lead to ground or
earth terminal.) Connect the equipment end of the line
cord to the AC (MAINS) POWER Connector (17) on the
rear panel of the SR107-2E. Select the proper operating
voltage (1 15V for 105-125V supply or 220V for 210-250V
supply). Maximum power consumption at either operating
voltage is 6 watts.
A POWER ON-OFF toggle switch (5) on the front panel
controls the application of ac power to the SR107 and a
red indicator lamp (6) indicates the power-on condition.
Functional Circuit Description
Input connections to the SR107 Audio Equalizer are
made through either a three-conductor (stereo type)
phone jack (14) or a three-pin female audio connector
(13) (see Figure 4). The connectors are wired in parallel
to provide a balanced line level input with either con-
nector. Inserting a two-conductor phone plug into the
phone jack will automatically unbalance the input. The
input signal is passed through a 6 dB stepdown input
transformer to an attenuator. The attenuator provides an
additional 11 to 26 dB of loss depending upon the setting
of the LEVEL Control (3) described later.
FIGURE 4.
SR107 BLOCK DIAGRAM
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