1231 User Manual

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Wiring Connections With Ground

InstallatIon ConsIderatIons

The12SeriesEqualizersaredesignedfornominal+4dBulevels.Theequalizerscanbe

usedwitheitherbalancedorunbalancedsources,andtheoutputscanbeusedwitheitherbalancedorunbalanced

loads,providedthepropercablingisused.

A balanced line is defined as two-conductor shielded cable with the two center conductors carrying the same signal

but of opposite polarity when referenced to ground. An unbalanced line is generally a single-conductor shielded

cable with the center conductor carrying the signal and the shield at ground potential.

Theequalizerhasaninputimpedanceof40kΩbalancedand20kΩ unbalanced. This

makes the 12 Series Equalizers’ audio inputs suitable for use with virtually any low source impedance (under 2kΩ).

Theequalizer’soutputiscapableofdrivinga600Ωloadto+18dBu.Formaximum

humrejectionwithabalancedsource,avoidcommongroundingattheequalizer’sinputsandoutputs.Mostbal-

anced(3-conductor)cableshavetheshieldconnectedatbothends.Thiscanresultingroundloopswhichcause

hum.Ifhumpersiststrydisconnectingtheshieldononeormoreofthecablesinthesystem,preferablyattheinput

ofadevice,notattheoutput.

operatIon and applICatIon notes

Thedbx12SeriesGraphicEqualizersareusefulaudiosignalprocessingtoolsinsituationswhereprecisefrequency

control is required across the audible frequency spectrum.

When used with an audio spectrum analyzer the EQs can tune any acoustical environment -- from the studio to the

concerthall--tostopringing,increaseclarity,andflattentheoverallfrequencyresponseoftheenvironment.A

real-time spectrum analyzer or other types of audio environment analyzers are very useful in determining the

amount of equalization needed.

Insertthegraphicequalizerbetweenthesignalsource(usuallyamixer)andthepoweramplifiers(orthecrossoverif

thereisone).Adjustthelevelandequalizationasrequiredtoyieldthedesiredsystemresponse.Thelongthrowfad-

ers of the EQs allow very precise settings of the equalization for accurate equalization curves.

Foroptimumsignal-to-noiseresponse,thegainstructureofthesoundsystemmustbeproperlysetup.Eachcompo-

nentofthesoundsystemshouldbesetatitsnominaloperatinglevel,startingwiththefirstelementinthesystem,

usually a mixing console. Each element should be run at its nominal operating level in order to take advantage of

themaximumsignal-to-noisepropertiesofthatelement.Loudspeakeramplifiers,asthelastelementinthechain,

shouldbesetonlyasloudasnecessary,inordertoavoidinducingunnecessarynoiseintothesystem.

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

OPERATION MANUAL

12 SERIES GRAPHIC EQUALIZERS

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User Manual - Page 9