User Manual

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).
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(
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+
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+
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Without Jumper in Place With Jumper in Place
jumper
optional
circuit
ground
chassis
ground
circuit
ground
chassis
ground
to system
ground
optional
WIRING CONNECTIONS WITH GROUND
Input
Cable
Output
Cable
Input
Cable
Output
Cable
)terminal
to some other ground point in your audio system in order for the equalizer to function properly.
4
OPERATION MANUAL