Mackie DLM12 Owner's Manual download pdf (Page 15)

Owner’s Manual

Appendix A: Service Information

Poor bass performance

• Checkthepolarityoftheconnectionsbetweenthe

  mixerandthesubwoofers.Youmayhaveyour

  positiveandnegativeconnectionsreversedatone

  endofonecable,causingonesubwoofertobe

  out-of-phasewiththeother.

• Poorbassperformancemaybetheresultofbad

  ACpower.Seethesectiontitled‘ACPower’on

  thepreviouspageforfurtherdetails.

Poor sound

• Isitloudanddistorted?Makesurethatyou’renot

  overdrivingastageinthesignalchain.Verifythat

  alllevelcontrolsaresetproperly.

• Istheinputconnectorpluggedcompletelyinto

  thejack?Besureallconnectionsaresecure.

Noise

• Makesureallconnectionstotheactive 

  subwoofersaregoodandsound.

• Makesurenoneofthesignalcablesarerouted

  nearACcables,powertransformers,orother

  EMI-inducingdevices.

• IstherealightdimmerorotherSCR-baseddevice

  onthesameACcircuitastheDLM12S?Usean

  AClinelterorplugthesubwooferintoa 

  differentACcircuit.

Hum

• Trydisconnectingthecableconnectedtothe

  inputjack.Ifthenoisedisappears,itcouldbe

  a“groundloop,”ratherthanaproblemwiththe

  DLM12Ssubwoofer.Trysomeofthefollowing

  troubleshootingideas:

• Usebalancedconnectionsthroughoutyoursystem

  forthebestnoiserejection.

• Wheneverpossible,plugalltheaudioequipment’s

  linecordsintooutletswhichshareacommon

  ground.Thedistancebetweentheoutletsandthe

  commongroundshouldbeasshortaspossible.

IfyouthinkyourMackieproducthasaproblem,

pleasecheckoutthefollowingtroubleshootingtipsand

doyourbesttoconrmtheproblem.VisittheSupport

sectionofourwebsite(www.mackie.com/support)

whereyouwillndlotsofusefulinformationsuchas

FAQsandotherdocumentation.Youmayndtheanswer

totheproblemwithouthavingtosendyourMackie

productaway.

Troubleshooting

No power

• Ourfavoritequestion:Isitpluggedin?Makesure

  theACoutletislive[checkwithatesterorlamp].

• Ournextfavoritequestion:Isthepowerswitch

  on?Ifnot,tryturningiton.

• Makesurethelinecordissecurelyseatedinthe

  linecordsocketandpluggedallthewayintothe

  ACoutlet.

• IsthepowerLEDonthefrontpanelglowing

  green?Ifnot,makesuretheACoutletislive.

  Ifso,referto“Nosound”below.

• TheinternalAClinefusemaybeblown.Thisis

  notauserserviceablepart.Ifyoususpectthe

  AClinefuseisblown,pleaseseethe"Repair"

  sectionnext.

No sound

• Istheinputlevelcontrolfortheinputsource

  turnedallthewaydown?Verifythatallthevolume

  controlsinthesystemareproperlyadjusted.

  Lookatthelevelmetertoensurethatthemixer

  isreceivingasignal.

• Isthesignalsourceworking?Makesurethe 

  connectingcablesareingoodrepairandsecurely

  connectedatbothends.Makesuretheoutput

  volume(gain)controlonthemixingconsoleis

  turnedupsufcientlytodrivetheinputsofthe

  speaker.

• Makesurethemixerdoesnothaveamuteonora

  processorloopengaged.Ifyoundsomethinglike

  this,makesurethevolume/gainisturneddown

  beforedisengagingtheoffendingswitch.

• Hasitshutdown?Makesurethereisatleast

  sixinchesoffreespacebehindeachDLM 

  subwoofer.

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Mackie DLM12 Owner's Manual Page 15

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