Mackie HD 1801 Car Speaker User Manual


  Open as PDF
of 21
 
POWER
18 -INCH HIGH DEFINITION POWERED SUBWOOFER
ON
REVISION
SERIAL NUMBER
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS:
RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
SETTINGS
POWER
LIGHT ON
SIG/ LIMIT
THERMAL
LEVEL
POLARITY
INVERT
FULL RANGE
HIGH PASS
OUTPUTS
A B
A B
A B
INPUTS
+6dB 6dB
-
HD1801
9. SIG/LIMIT LED
Thisbi-colorLEDilluminatesgreenwheneverthereis
asignalpresentatthemaininputs.Itsensesthesignal
justafterthelevelcontrol,soadjustmentstothelevel
controlwillaffectthesig/limitindicator.
TheHD1801hasabuilt-inlimiterthathelpstopre-
venttheamplieroutputsfromclippingoroverdriving
thetransducer.Thesig/limitindicatorlightsinyellow
whenthelimiterisactivated.It’sokayforittoblink
yellowoccasionally,butifitblinksfrequentlyorlights
continuously,turndowntheinputleveluntilitonly
blinksoccasionally.
Excessivelimitingmayleadto
overheating,whichinturntripsthethermal
protectcircuitryandinterruptsthe
performance.See‘ThermalConsiderations’on
page14formoreinformation.
10. THERMAL LED
TheHD1801isequippedwithathermalprotection
circuitthatmonitorstheinternaltemperatureofthe
amplierandheatsink.Ifthetemperaturebeginsto
exceedasafeoperatinglevel,thisindicatorlightsand
theamplieroutputislimitedtoallowtheamplierto
cool.Iftheamplierbecomesexcessivelyhot,theampis
muteduntilitcools,thentheHD1801returnstonormal
operation.
WhentheHD1801isinthermalprotectmode,the
powerLED(2)willremainlit,indicatingthattheunit
isstillpoweredondespitethelackofoutput.IfPOWER
LIGHTON(7)isengaged,thefrontpanelpowerLED
willgooutwheninthermalprotectmode.
Activationofthethermalprotectioncircuit
isanindicationthatyoushouldtakesteps
toavoidcontinuedthermalproblems.See
“ThermalConsiderations”onpage14.
10
HD1801
HD1801
4
5
6
7
10
3
9
8
 previous next