Mackie Thump18S - Protection and Power Management; Protection Circuitry Overview; Thermal Protection; AC Power Requirements

Owner’s Manual
13
Owner’s Manual
Protection Circuitry
4HE4HUMP3SUBWOOFEREMPLOYSABUILTINLIMITER
FORLESSDISTORTIONATPEAKLEVELS!DDITIONALPROTECTION
INCLUDESAUTOMATICTHERMALSHUTDOWNSHOULDTHEAMP
OVERHEAT(OWEVERWITH#LASS$AMPTECHNOLOGYWHICH
ISHIGHLYEFlCIENTTHISSHOULDNEVERBEAPROBLEM
4HEPROTECTIONCIRCUITSAREDESIGNEDTO
PROTECTTHESUBWOOFERSUNDERREASONABLE
ANDSENSIBLECONDITIONS3HOULDYOUCHOOSE
TOIGNORETHEWARNINGSIGNS;EGEXCESSIVEDISTORTION=
YOUCANSTILLDAMAGETHESPEAKERINTHE4HUMP3BY
OVERDRIVINGITPASTTHEPOINTOFAMPLIlERCLIPPING 
3UCHDAMAGEISBEYONDTHESCOPEOFTHEWARRANTY
Limiting
4HEDRIVERHASITSOWNCOMPRESSIONCIRCUITWHICH
HELPSPROTECTITFROMDAMAGINGTRANSIENTPEAKS 
4HECOMPRESSORISDESIGNEDTOBETRANSPARENTAND
ISNOTNOTICEABLEUNDERNORMALOPERATINGCONDITIONS
Overexcursion Protection
!SUBSONIClLTERCIRCUITJUSTPRIORTOTHEPOWER
AMPLIlERPREVENTSULTRALOWFREQUENCIESFROMBEING
AMPLIlED%XCESSIVELOWFREQUENCYENERGYCANDAMAGE
THEWOOFERBYCAUSINGITTOhBOTTOMOUTvALSOKNOW
ASOVEREXCURSIONWHICHISEQUIVALENTTOAMECHANICAL
FORMOFCLIPPING
Thermal Protection
!LLAMPLIlERSPRODUCEHEAT4HE4HUMP3IS
DESIGNEDTOBEEFlCIENTBOTHELECTRICALLYANDTHERMALLY
)NTHEUNLIKELYEVENTOFTHEAMPLIlEROVERHEATING
ABUILTINTHERMALSWITCHWILLACTIVATEMUTINGTHE
SIGNAL
7HENTHEAMPLIlERHASCOOLEDDOWNTOASAFE
OPERATINGTEMPERATURETHETHERMALSWITCHRESETS
ITSELFANDTHE4HUMP3SUBWOOFERRESUMESNORMAL
OPERATION
)FTHETHERMALSWITCHACTIVATESTRYTURNINGDOWN
THELEVELCONTROLANOTCHORTWOONTHEMIXINGCONSOLE
ORTHEBACKOFTHESUBWOOFERTOAVOIDOVERHEATINGTHE
AMPLIlER"EAWARETHATDIRECTSUNLIGHTANDORHOTSTAGE
LIGHTSMAYBETHECULPRITOFANAMPLIlEROVERHEATING
AC Power
"ESURETHE4HUMP3SUBWOOFERISPLUGGEDINTO
ANOUTLETTHATISABLETOSUPPLYTHECORRECTVOLTAGE
SPECIlEDFORYOURMODEL)TWILLCONTINUETOOPERATE
ATLOWERVOLTAGESBUTWILLNOTREACHFULLPOWER
"ESURETHEELECTRICALSERVICECANSUPPLYENOUGH
AMPERAGEFORALLTHECOMPONENTSCONNECTEDTOIT
7ERECOMMENDTHATASTIFFROBUSTSUPPLYOF!#
POWERBEUSEDBECAUSETHEAMPLIlERSPLACEHIGH 
CURRENTDEMANDSONTHE!#LINE4HEMOREPOWERTHATIS
AVAILABLEONTHELINETHELOUDERTHESPEAKERSWILLPLAY
ANDTHEMOREPEAKOUTPUTPOWERWILLBEAVAILABLEFORA
CLEANERPUNCHIERBASS!SUSPECTEDPROBLEMOFhPOOR
BASSPERFORMANCEvISOFTENCAUSEDBYAWEAK!#SUPPLY
TOTHEAMPLIlERS
.EVERREMOVETHEGROUNDPINONTHE
POWERCORDORANYOTHERCOMPONENTOFTHE
4HUMP3SUBWOOFER4HISISVERYDANGEROUS