4
OPERATION MANUAL
C
onneCting
t
he
eQ t
o
y
our
s
ysteM
The 20 Series Equalizers have balanced inputs and outputs that can be used with any balanced or unbalanced line-
level device. For more specific information about cabling possibilities, please refer to the section entitled
Installation Considerations, Page 5
.
To connect the equalizer to your sound system refer to the following steps:
• Turn off all equipment before making connections.
• Mount equalizer in a standard-width rack.
Install the EQs in a rack with the rack screws provided. It can be mounted above or below anything that does
not generate excessive heat. Ambient temperatures should not exceed 113° F (45°C) when equipment is in use.
Although the unit’s chassis is shielded against radio frequency and electromagnetic interference, extremely
high fields of RF and EMI should be avoided.
• Make audio connections via XLR, barrier strip, or 1/4” TRS jacks (according to application needs)
All three types of connectors for the inputs and outputs can be used for balanced or unbalanced connections.
The use of more than one connector at a time for the inputs could unbalance balanced lines, cause phase cancel
-
lation, short a conductor to ground, or cause damage to other equipment connected to the equalizer. More than
one output may be used simultaneously as long as the combined parallel load is greater than 600
ΩΩ
.
• Select the operating range with the
BOOST/CUT RANGE SELECTION switch
Note: Be sure to reduce audio levels at the power amplifiers when changing the setting of this switch as it may generate an audible transient.
• apply power to the equalizer
Connect the AC power cord to the AC power receptacle on the back of the equalizer. Route the AC power cord
to a convenient power outlet away from audio lines. The unit may be turned on and off from the rear panel
power switch or a master equipment power switch. Since the 20 Series Equalizers consume a relatively small
amount of power, the units may be left on continuously.
r
ear
p
anel
d
esCriptions
Rear Panels
2031 - single channel 31 band graphic equalizer
2231 - dual channel 31 band graphic equalizer
4
#85-1565-P1 2031 REAR ART (12-10-96) buyoff
15 WATTS
POWER
OUTPUT
-
+
INPUT
-
+
OUTPUT
INPUT
PHONE:
TIP
RING
SLEEVE
XLR:
PIN 1
PIN 2
PIN 3
CONNECTOR POLARITY
INPUT
OUTPUT
100V 50/60Hz
120V 60Hz
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 2031
EQUALIZER/LIMITER WITH
TYPE III NOISE REDUCTION
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING
U.S. PATENTS: 4,234,804 4,316,107 4,329,598 4,331,931 4,377,792
4,403,199 4,409,500 4,425,551 4,434,380 4,454,433 4,471,324
4,473,793 OTHER PATENTS PENDING
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION:
RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
TO REDUCE
THE RISK OF FIRE REPLACE
ONLY WITH SAME TYPE FUSE.
ATTENTION:
UTILISER
UN FUSIBLE DE RECHANGE DE
MEME TYPE.
#85-2569-P0 2231 REAR ART (12-10-96) buyoff
28 WATTS
OUTPUT
INPUT
PHONE:
TIP
RING
SLEEVE
XLR:
PIN 1
PIN 2
PIN 3
CONNECTOR POLARITY
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
OUTPUT
100V 50/60Hz
120V 60Hz
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 2231
EQUALIZER/LIMITER WITH
TYPE III NOISE REDUCTION
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION:
RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
CAUTION:
TO REDUCE
THE RISK OF FIRE REPLACE
ONLY WITH SAME TYPE FUSE.
ATTENTION:
UTILISER
UN FUSIBLE DE RECHANGE DE
MEME TYPE.
POWER
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING
U.S. PATENTS: 4,234,804 4,316,107 4,329,598 4,331,931 4,377,792
4,403,199 4,409,500 4,425,551 4,434,380 4,454,433 4,471,324
4,473,793 OTHER PATENTS PENDING
OUTPUT
-
+
INPUT
-
+
OUTPUT
-
+
INPUT
-
+