Mackie SRM450v3 - Smart Protect Mechanisms; Limiting and Overexcursion Protection; Thermal Overheat Protection; AC Power Requirements

SRM350v3 and SRM450v3 Powered Loudspeakers
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SRM350v3 and SRM450v3 Powered Loudspeakers
Smart Protect
ThereareadvancedDSPprotectionmechanisms
designedintotheSRM350v3andSRM450v3
tosafeguardtheloudspeakersandampliers
frominadvertentdamage.
Theprotectioncircuitsaredesignedto 
protecttheloudspeakersunderreasonable
andsensibleconditions.Shouldyouchoose
toignorethewarningsigns[e.g.excessivedistortion],
youcanstilldamagethespeakerbyoverdrivingitpast
thepointofamplierclipping.Suchdamageisbeyond
thescopeofthewarranty.
Limiting
Eachdriverhasitsowncompressioncircuitwhich
helpsprotectitfromdamagingtransientpeaks. 
Thecompressorisdesignedtobetransparentand
isnotnoticeableundernormaloperatingconditions.
Overexcursion Protection
An18dB/octavehigh-passlterjustpriortothe
low-frequencyamplierpreventsverylowfrequencies
frombeingamplied.Excessivelow-frequencyenergy
candamagethewooferbycausingitto“bottomout,”
alsoknowasoverexcursion,whichisequivalenttoa
mechanicalformofclipping.
Thermal Protection
Allampliersproduceheat.SRMv3loudspeakersare
designedtobeefcientbothelectricallyandthermally.
Intheunlikelyeventoftheamplieroverheating,
abuilt-inthermalswitchwillactivate,mutingthe
signal.
Whentheamplierhascooleddowntoasafe
operatingtemperature,thethermalswitchresetsitself,
andtheSRMv3loudspeakerresumesnormaloperation.
Ifthethermalswitchactivates,tryturningdownthe
levelcontrolanotchortwoonthemixingconsole(or
thebackoftheloudspeaker)toavoidoverheatingthe
amplier.Beawarethatdirectsunlightand/orhotstage
lightsmaybetheculpritofanamplieroverheating.
AC Power
BesuretheSRMv3loudspeakerispluggedintoan
outletthatisabletosupplythecorrectvoltagespecied
foryourmodel.Itwillcontinuetooperateatlower
voltages,butwillnotreachfullpower.
Besuretheelectricalservicecansupplyenough
amperageforallthecomponentsconnectedtoit.
Werecommendthatastiff(robust)supplyofAC
powerbeusedbecausetheampliersplacehigh 
currentdemandsontheACline.The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.Asuspectedproblemof“poor
bassperformance”isoftencausedbyaweakACsupply
totheampliers.
Neverremovethegroundpinonthepower
cordoranyothercomponentoftheSRMv3
loudspeaker.Thisisverydangerous.
Care and Maintenance
SRMv3loudspeakerswillprovidemanyyears
ofreliableserviceifyoufollowtheseguidelines:
• Avoidexposingtheloudspeakerstomoisture.
Iftheyaresetupoutdoors,besuretheyare
undercoverifrainisexpected.
• Avoidexposuretoextremecold(below
freezingtemperatures).Ifyoumustoperate
theloudspeakersinacoldenvironment,warm
upthevoicecoilsslowlybysendingalow-level
signalthroughthemforabout15minutesprior
tohigh-poweroperation.
• Useadryclothtocleanthecabinets.Onlydo
thiswhenthepoweristurnedoff.Avoidgetting
moistureintoanyoftheopeningsofthe
cabinet,particularlywherethedriversare
located.