Thump18S P
o
w
e
red Sub
w
oof
er
14
Thump18S Powered Subwoofer
Appendix A: Service Information
Poor bass performance
s #HECKTHEPOLARITYOFTHECONNECTIONSBETWEENTHE
MIXERANDTHESUBWOOFERS9OUMAYHAVEYOUR
POSITIVEANDNEGATIVECONNECTIONSREVERSEDATONE
ENDOFONECABLECAUSINGONESUBWOOFERTOBE
OUTOFPHASEWITHTHEOTHER
s 0OORBASSPERFORMANCEMAYBETHERESULTOFBAD
!#POWER3EETHESECTIONTITLED@!#0OWERON
THEPREVIOUSPAGEFORFURTHERDETAILS
Poor sound
s )SITLOUDANDDISTORTED-AKESURETHATYOURENOT
OVERDRIVINGASTAGEINTHESIGNALCHAIN6ERIFYTHAT
ALLLEVELCONTROLSARESETPROPERLY
s )STHEINPUTCONNECTORPLUGGEDCOMPLETELYINTO
THEJACK"ESUREALLCONNECTIONSARESECURE
Noise
s -AKESUREALLCONNECTIONSTOTHEACTIVE
SUBWOOFERSAREGOODANDSOUND
s -AKESURENONEOFTHESIGNALCABLESAREROUTED
NEAR!#CABLESPOWERTRANSFORMERSOROTHER
%-)INDUCINGDEVICES
s )STHEREALIGHTDIMMEROROTHER3#2BASEDDEVICE
ONTHESAME!#CIRCUITASTHE4HUMP35SEAN
!#LINElLTERORPLUGTHESUBWOOFERINTOA
DIFFERENT!#CIRCUIT
Hum
s 4RYDISCONNECTINGTHECABLECONNECTEDTOTHE
INPUTJACK)FTHENOISEDISAPPEARSITCOULDBE
AhGROUNDLOOPvRATHERTHANAPROBLEMWITHTHE
4HUMP3SUBWOOFER4RYSOMEOFTHEFOLLOWING
TROUBLESHOOTINGIDEAS
s 5SEBALANCEDCONNECTIONSTHROUGHOUTYOURSYSTEM
FORTHEBESTNOISEREJECTION
s 7HENEVERPOSSIBLEPLUGALLTHEAUDIOEQUIPMENTS
LINECORDSINTOOUTLETSWHICHSHAREACOMMON
GROUND4HEDISTANCEBETWEENTHEOUTLETSANDTHE
COMMONGROUNDSHOULDBEASSHORTASPOSSIBLE
)FYOUTHINKYOUR4HUMP3HASAPROBLEMPLEASE
CHECKOUTTHEFOLLOWINGTROUBLESHOOTINGTIPSANDDO
YOURBESTTOCONlRMTHEPROBLEM6ISITTHE3UPPORT
SECTIONOFOURWEBSITEWWWTREESCOM WHEREYOU
WILLlNDLOTSOFUSEFULINFORMATIONSUCHAS&!1SAND
OTHERDOCUMENTATION9OUMAYlNDTHEANSWERTOTHE
PROBLEMWITHOUTHAVINGTOPARTWITHYOURSUBWOOFER
Troubleshooting
No power
s /URFAVORITEQUESTION)SITPLUGGEDIN-AKESURE
THE!#OUTLETISLIVE;CHECKWITHATESTERORLAMP=
s /URNEXTFAVORITEQUESTION)STHEPOWERSWITCH
ON)FNOTTRYTURNINGITON
s -AKESURETHELINECORDISSECURELYSEATEDINTHE
LINECORDSOCKETANDPLUGGEDALLTHEWAYINTOTHE
!#OUTLET
s )STHEPOWER,%$ONTHEFRONTANDREARPANEL
ILLUMINATED)FNOTMAKESURETHE!#OUTLET
ISLIVE)FSOREFERTOh.OSOUNDvBELOW
s 4HEINTERNAL!#LINEFUSEMAYBEBLOWN4HISIS
NOTAUSERSERVICEABLEPART)FYOUSUSPECTTHE
!#LINEFUSEISBLOWNPLEASESEETHE2EPAIR
SECTIONNEXT
No sound
s )STHELEVELKNOBFORTHEINPUTSOURCETURNEDALL
THEWAYDOWN6ERIFYTHATALLTHEVOLUMECONTROLS
INTHESYSTEMAREPROPERLYADJUSTED,OOKATTHE
LEVELMETERTOENSURETHATTHEMIXERISRECEIVING
ASIGNAL
s )STHESIGNALSOURCEWORKING-AKESURETHE
CONNECTINGCABLESAREINGOODREPAIRANDSECURELY
CONNECTEDATBOTHENDS-AKESURETHEOUTPUT
LEVELCONTROLONTHEMIXINGCONSOLEISTURNEDUP
SUFlCIENTLYTODRIVETHEINPUTSOFTHESPEAKER
s -AKESURETHEMIXERDOESNOTHAVEAMUTEONORA
PROCESSORLOOPENGAGED)FYOUlNDSOMETHINGLIKE
THISMAKESURETHELEVELISTURNEDDOWNBEFORE
DISENGAGINGTHEOFFENDINGSWITCH
s (ASITSHUTDOWN-AKESURETHEREISATLEAST
SIXINCHESOFFREESPACEBEHINDEACH4HUMP3
SUBWOOFER
