User guide

4
OPERATION MANUAL
ConneCting the eQ to your systeM
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:


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.

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600Ω.
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.

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.
rear panel desCriptions
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
INPUTOUTPUT
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
A TTENTION: 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
INPUTOUTPUT
OUTPUT INPUT
INPUTOUTPUT
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
- +