Mackie 750 Speaker User Manual


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SRM550 • SRM650 • SRM750 Powered Loudspeakers
10
SRM550 • SRM650 • SRM750 Powered Loudspeakers
SRM Loudspeaker: Rear Panel Features continued...
Toconnectbalancedlinestotheseinputs,usea
1/4"Tip-Ring-Sleeve(TRS)plug.“TRS”standsfor
Tip-Ring-Sleeve,thethreeconnectionpoints
availableonastereo1/4"orbalancedphonejack
orplug.TRSjacksandplugsareusedforbalanced
signalsandstereoheadphonesandarewiredasfollows
accordingtostandardsspeciedbytheAES(Audio
EngineeringSociety):
Balanced 1/4" TRS Connector
Sleeve–Shield(ground)
Tip–Positive(+orhot)
Ring–Negative(–orcold)
Toconnectunbalancedlinestotheseinputs,usea
1/4"mono(TS)phoneplug,wiredasfollowsaccording
tostandardsspeciedbytheAES(AudioEngineering
Society):
Unbalanced 1/4" TS Connector
Sleeve–Shield(ground)
Tip–Positive(+orhot)
Formoreinformationontheseconnectors,see
AppendixBonpage20.
4. Gain Knobs
Thegainknobsadjusttheinputsensitivityofthe
micandmic/line/RCAinputs.Thisallowssignalsfrom
theoutsideworldtobeadjustedtorunthrougheach
channelatoptimalinternaloperatinglevels.
Thereis–
dBofgainwiththeknobfullydown
(off),rampingupto50dBofgainfullyup(max).
TheaccompanyingLEDwillilluminategreenwhen
thechannel’sinputsignalispresent,indicatingsignal.
Itwillremainlitsolongasthereissignalabove
–20dBupresentinthatchannel.
SLEEVE
TIP
SLEEVE
TIP
RING
RING
TIP
SLEEVERING
Balanced 1/4" TRS Connector
SLEEVE
TIP
TIP
SLEEVE
TIP
SLEEVE
Unbalanced 1/4" TS Connector
TheaccompanyingLEDwillilluminateredwhenthe
amplierintheSRMloudspeakerisneartheclipping
point.ItisokayifthisLEDblinksoccasionally,because
thismeansthatthetransientpeaksarejustreaching
themaximumoutputoftheampliersandyouare
gettingthemostoutofyourloudspeaker.
Ifconnectingmixeroutputstoloudspeaker
inputs,setthegainknobto10:00[“Line”]
foroptimalsoundandperformance.
5. RCA Inputs [Channel 2 Only]
ThestereounbalancedRCAinputsallowyouto
playaCDplayer,iPod
®
,orotherline-levelsource. 
TheRCAjacksacceptanunbalancedsignalusing
standardhi-[RCA]hookupcables.
NEVERconnecttheoutputofanamplier
directlytotheinputoftheloudspeaker.
Thiscoulddamagetheinputcircuitry
oftheactiveloudspeaker.
Theyarewiredasfollows,accordingtostandards
speciedbytheAES(AudioEngineeringSociety):
Unbalanced RCA Connector
Sleeve–Shield(ground)
Tip–Positive(+orhot)
 Formoreinformationontheseconnectors,see
AppendixBonpage20.
TIPSLEEVETIPSLEEVE
Unbalanced RCA Connector
SIG/OLSIG/OL
3 5 6
74
8 9 10
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