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SC-1250 Amplifier User’s Manual - 9
(18) Speaker Level Input Terminals (See Figure 5)
Connecttheseinputterminalstothespeakeroutputterminalsofyouramplifierorreceiver.Ifyouuse
this method of connection, when you go to the receiver speaker set up menu, make sure you select the
“large” speaker option.
(19) Subwoofer Connection Terminals
Connect these output terminals to the subwoofer(s) being controlled by the SC-1250. onlyconnect one
subwooferperred/blackpairofsubwooferoutputterminals-DONOTconnectthesubwoofersina
“daisychain”configuration.
Note: SC series subwoofers are designed so that TWo subwoofers can be driven from asingle SC-1250
amplifier.IfyouareusingtheSC-1250topoweranon-SCsubwoofer,makesureyouchecktheresistanceof
the subwoofer’s voice coil. A SInGle 4 ohm subwoofer canbe driven with the SC-1250, but not TWo 4 ohm
woofers. If you attempt to run more than asingle 4 ohm subwoofer, internal protection circuitry will activate
within the SC-1250.
Caution!!!
To avoid damage to your SC-1250, be sure to maintain correct polarity when making all connections. Red
(positive) to red, and black (negative) to black. Be sure that all connections are tight, and that there are no loose
strands or frayed wires.
(20) power Cord Adaptor
Connectthedetachable117V~60Hz15AACpowerplugtothismaleinterfaceconnection.Thedetachable
cord allows for easy replacement should the original be damaged.
(21) Fuse
If the unit is not functioning, check the fuse. If the fuse is blown, replace with an identically rated fuse. If
the fuse blows again, refer the unit for service.
(22) Master power Switch
PressthePOWERswitchtotheONpositiontoactivatetheamplifier.Iftheunitistobeleftunusedfor
anextendedperiodoftime,movethisswitchtotheOFFpositiontoprolongthelifeoftheamplifier.
REAR PANEL CONNECTIONS – DETAILED EXPLANATION
TheSC-1250isequippedwithbothspeaker-levelandline-levelinputs.UsetheRCA/Phonotype“INPUT”jacks
whenconnectingfromapre-amp,signalprocessor,orline-levelcrossover.The“SPEAKERLEVELINPUT”jacks
connectdirectlytothespeakeroutputsofanintegratedamplifierorreceiver.Youramplifiersectionwillnotice
noadditionalloadingeffectswhenyouusetheseinputsbecauseoftheirhighimpedance.
Note: Do not use both the RCA/Phono “INPUT” connections and “SPEAKER LEVEL INPUT” connections
simultaneously.
About Low-Pass Crossovers
All of the SC-1250 inputs sum the left and right channels together and the resulting signal is passed through
anadjustablelow-passcrossoverbeforebeingamplified.Thecrossovercontrolallowsyoutoadjusttheupper
limitofthesubwoofer’sfrequencyresponsefrom30to160Hz.Thesubwoofer’sresponsewillbeginrollingoff
abovethefrequencyyousetthiscontrolto.Theslopeis24dB/octave.