Mackie Thump18S - Service and Troubleshooting; Troubleshooting Common Issues; Performance and Noise Issues

Thump18S Powered Subwoofer
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Thump18S Powered Subwoofer
Appendix A: Service Information
Poor bass performance
s #HECKTHEPOLARITYOFTHECONNECTIONSBETWEENTHE
  MIXERANDTHESUBWOOFERS9OU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
s 0OORBASSPERFORMANCEMAYBETHERESULTOFBAD
  !#POWER3EETHESECTIONTITLED@!#0OWERON
  THEPREVIOUSPAGEFORFURTHERDETAILS
Poor sound
s )SITLOUDANDDISTORTED-AKESURETHATYOURENOT
  OVERDRIVINGASTAGEINTHESIGNALCHAIN6ERIFYTHAT
  ALLLEVELCONTROLSARESETPROPERLY
s )STHEINPUTCONNECTORPLUGGEDCOMPLETELYINTO
  THEJACK"ESUREALLCONNECTIONSARESECURE
Noise
s -AKESUREALLCONNECTIONSTOTHEACTIVE 
  SUBWOOFERSAREGOODANDSOUND
s -AKESURENONEOFTHESIGNALCABLESAREROUTED
  NEAR!#CABLESPOWERTRANSFORMERSOROTHER
  %-)INDUCINGDEVICES
s )STHEREALIGHTDIMMEROROTHER3#2BASEDDEVICE
  ONTHESAME!#CIRCUITASTHE4HUMP35SEAN
  !#LINElLTERORPLUGTHESUBWOOFERINTOA 
  DIFFERENT!#CIRCUIT
Hum
s 4RYDISCONNECTINGTHECABLECONNECTEDTOTHE
  INPUTJACK)FTHENOISEDISAPPEARSITCOULDBE
  AhGROUNDLOOPvRATHERTHANAPROBLEMWITHTHE
  4HUMP3SUBWOOFER4RYSOMEOFTHEFOLLOWING
  TROUBLESHOOTINGIDEAS
s 5SEBALANCEDCONNECTIONSTHROUGHOUTYOURSYSTEM
  FORTHEBESTNOISEREJECTION
s 7HENEVERPOSSIBLEPLUGALLTHEAUDIOEQUIPMENTS
  LINECORDSINTOOUTLETSWHICHSHAREACOMMON
  GROUND4HEDISTANCEBETWEENTHEOUTLETSANDTHE
  COMMONGROUNDSHOULDBEASSHORTASPOSSIBLE
)FYOUTHINKYOUR4HUMP3HASAPROBLEMPLEASE
CHECKOUTTHEFOLLOWINGTROUBLESHOOTINGTIPSANDDO
YOURBESTTOCONlRMTHEPROBLEM6ISITTHE3UPPORT
SECTIONOFOURWEBSITEWWWTREESCOMWHEREYOU
WILLlNDLOTSOFUSEFULINFORMATIONSUCHAS&!1SAND
OTHERDOCUMENTATION9OUMAYlNDTHEANSWERTOTHE
PROBLEMWITHOUTHAVINGTOPARTWITHYOURSUBWOOFER
Troubleshooting
No power
s /URFAVORITEQUESTION)SITPLUGGEDIN-AKESURE
  THE!#OUTLETISLIVE;CHECKWITHATESTERORLAMP=
s /URNEXTFAVORITEQUESTION)STHEPOWERSWITCH
  ON)FNOTTRYTURNINGITON
s -AKESURETHELINECORDISSECURELYSEATEDINTHE
  LINECORDSOCKETANDPLUGGEDALLTHEWAYINTOTHE
  !#OUTLET
s )STHEPOWER,%$ONTHEFRONTANDREARPANEL
  ILLUMINATED)FNOTMAKESURETHE!#OUTLET
  ISLIVE)FSOREFERTOh.OSOUNDvBELOW
s 4HEINTERNAL!#LINEFUSEMAYBEBLOWN4HISIS
  NOTAUSERSERVICEABLEPART)FYOUSUSPECTTHE
  !#LINEFUSEISBLOWNPLEASESEETHE2EPAIR
  SECTIONNEXT
No sound
s )STHELEVELKNOBFORTHEINPUTSOURCETURNEDALL
  THEWAYDOWN6ERIFYTHATALLTHEVOLUMECONTROLS
  INTHESYSTEMAREPROPERLYADJUSTED,OOKATTHE
  LEVELMETERTOENSURETHATTHEMIXERISRECEIVING
  ASIGNAL
s )STHESIGNALSOURCEWORKING-AKESURETHE 
  CONNECTINGCABLESAREINGOODREPAIRANDSECURELY
  CONNECTEDATBOTHENDS-AKESURETHEOUTPUT
  LEVELCONTROLONTHEMIXINGCONSOLEISTURNEDUP
  SUFlCIENTLYTODRIVETHEINPUTSOFTHESPEAKER
s -AKESURETHEMIXERDOESNOTHAVEAMUTEONORA
  PROCESSORLOOPENGAGED)FYOUlNDSOMETHINGLIKE
  THISMAKESURETHELEVELISTURNEDDOWNBEFORE
  DISENGAGINGTHEOFFENDINGSWITCH
s (ASITSHUTDOWN-AKESURETHEREISATLEAST
  SIXINCHESOFFREESPACEBEHINDEACH4HUMP3
  SUBWOOFER