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power switch or a master equipment power switch. Since the 12 Series Equalizers consume a relatively small
amount of power, the units may be left on continuously.
REAR
PANEL DESCRIPTIONS
Rear Panels
1231 - dual channel 31 band graphic equalizer
1215 - dual channel 15 band graphic equalizer
Power Switch: Switches the power on and off. Always make audio connections with the power switch in the OFF
position.
Power Cord Receptacle: Connects AC power to the equalizer.
Output Connectors: Three types of output connectors are provided for output connections: male XLR type con-
nectors, 1/4" tip-ring-sleeve phone jack connectors and a barrier strip.
Input Connectors: Three types of input connectors are provided for input connections: female locking XLR type
connectors, 1/4" tip-ring-sleeve phone jack connectors, and a barrier strip. The maximum input level that the equal-
izer can accept is +22dBu (ref: 0.775Vrms).
Chassis Ground Lift Strap: By removing the jumper connecting the two screws on the barrier strip, the chassis
ground is separated from the circuit ground of the equalizer. This is sometimes necessary to prevent “ground loops”
in a sound system. When lifting the ground strap, you must make a connection from the circuit ground ( ) terminal
to some other ground point in your audio system in order for the equalizer to function properly.
4
®
OPERATION MANUAL
24 WATTS
OUTPUT INPUT
PHONE:
TIP
RING
SLEEVE
XLR:
PIN 1
PIN 2
PIN 3
CONNECTOR POLARITY
INPUTOUTPUT
OUTPUT INPUT
INPUTOUTPUT
100V 50/60Hz
120V 60Hz
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 1231
EQUALIZER
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
-
+
OUTPUT
-
+
INPUT
-
+
OUTPUT INPUT
PHONE:
TIP
RING
SLEEVE
XLR:
PIN 1
PIN 2
PIN 3
CONNECTOR POLARITY
INPUTOUTPUT
OUTPUT
-
+
INPUT
-
+
OUTPUT INPUT
INPUTOUTPUT
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
SALT LAKE CITY, UTAH
MADE IN USA
MODEL 1215
EQUALIZER
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING
U.S. PATENTS: 4,234,804 4,316,107 4,329,598 4,331,931 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.
24 WATTS
POWER
100V 50/60Hz
120V 60Hz