Mackie Thump18S - Rear Panel Controls; Level Knob and OL LED; Polarity Switch Function

Owner’s Manual
11
Owner’s Manual
Thump18S Subwoofer: Rear Panel Features continued...
7. Level Knob / OL LED
4HELEVELKNOBADJUSTSTHEINPUTSENSITIVITYOFTHE
INPUTS4HISALLOWSSIGNALSFROMTHEOUTSIDEWORLDTO
BEADJUSTEDTORUNTHROUGHEACHCHANNELATOPTIMAL
INTERNALOPERATINGLEVELS4HEREISnD"OFGAINWITHTHE
KNOBFULLYDOWNOFFRAMPINGUPTOD"OFGAINFULLY
UPMAX4HELEVELCONTROLHASNOEFFECTONTHEHIGH
PASSOUTPUTSORFULLRANGEOUTPUTS
4HEACCOMPANYING/,OVERLOADINDICATOR
ILLUMINATESREDWHENTHEAMPLIlERINTHE4HUMP3
ISNEARTHECLIPPINGPOINT)TIS/+IFTHE/,,%$BLINKS
OCCASIONALLYBECAUSETHISMEANSTHATTHETRANSIENT
PEAKSAREJUSTREACHINGTHEMAXIMUMOUTPUTOF
THEAMPLIlERANDYOUAREGETTINGTHEMOSTOUTOF
THESUBWOOFER
(OWEVERIFTHE/,,%$ISBLINKINGFREQUENTLY
ORCONTINUOUSLYTURNDOWNTHELEVELCONTROLON
THE4HUMP3ORTURNDOWNTHESIGNALATITSSOURCE
EGTHEMIXINGCONSOLEUNTILTHE/,,%$BLINKS
OCCASIONALLYORNOTATALL
8. Normal/Invert Switch [Polarity]
4HISSWITCHREVERSESTHEPOLARITYOFTHESIGNALGOING
INTOTHESUBWOOFERAMPLIlERBY)THASNOEFFECTON
THESIGNALATTHEOUTPUTS
4HEREISNORIGHTORWRONGSETTINGFORTHISSWITCH
,ISTENTOTHEOVERALLBLENDOFTHESUBWOOFERWITH 
THERESTOFTHESYSTEMANDSELECTTHESWITCHPOSITION
THATGIVESYOUTHEBESTSOUNDFORYOURAUDIENCE
)NFACTYOURSYSTEMMAYVARYWHENPOSITIONED 
DIFFERENTLYANDINALTERNATEVENUES$ONTBEAFRAID
TOEXPERIMENTWITHTHEPOSITIONOFTHEPOLARITYSWITCH
3EEPAGEFORMOREINFORMATION
Questionnaire
4HEREISQUITEABITOFBLANKSPACELEFTOVERSOWHYNOT
lLLITWITHAQUESTIONNAIRE
s"EATLESOR3TONES
s3TAR7ARSOR3TAR4REK
s#HOCOLATEORVANILLA
s"ATMANOR3UPERMAN
s$OGSORCATS
s"EERORWHISKEY
s0IZZAORCHEESEBURGER
s&OOTBALLORBASEBALL
s0LAYSTATIONOR8BOX
s*IMMY0AGEOR*IMI(ENDRIX
s&AMILY'UYOR3OUTH0ARK
s#OFFEEORTEA
s7HATISYOURFAVORITECOLOR
s7HATISTHEAIRSPEEDVELOCITYOFANUNLADEN
SWALLOW
Final Thoughts
4HEFOLLOWINGPAGESDISCUSS4HUMP3PLACEMENTAN
INDEPTHLOOKATPOLARITYPROTECTIONCIRCUITRYTECHNICAL
INFORMATIONANDMUCHMORE#HECKITOUT