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.The amplifiermaybeoperatedinstereomode,inmono parallelmode,orinmonobridgemode.Duetoa switchablefiltertheamplifiermayalsobeusedonly forsubwoofersoronlyforthefrequencyrange exceeding120Hz.Extensiveprotectivecircuitspro- tecttheamplifierandthespeakersconnected.Two powerful,temperature-controlledfanssupplythe necessarycoolingoftheamplifier. 4Setting-Up Theamplifierisprovidedforinstallationintoarack (482mm/19"),butitmayalsobeusedasatabletop unit.Ineachcaseairmustbeallowedtoflowfreely throughallventilationslotssothatasufficientcool- ingisensured. 4.1Rackinstallation Forrackmounting2rs(rackspaces)=89mmare required.Theheatedairblownoutbytheamplifierat therearmustbeabletodissipatefromtherack,oth- erwiseaheataccumulationwilloccurintherackwhich maynotonlydamagetheamplifierbutalsootherunits intherack.Incasetheheatisnotdissipatedsuffi- ciently,afanunithastobeinsertedintotherack. Topreventtop-heavinessoftherack,theampli- fiermustbeinsertedinthelowerpartoftherack.To ensureasafefixing,thefrontpanelaloneisnotsuf- ficient.Inaddition,theunitmustbefastenedatthe rearsideorbesupportedbymeansoflateralrailsor abottomplate. 5ConnectingtheAmplifier Allconnectionsmustonlybemadeorchangedwith theunitswitchedoff! 1)Connecttheoutputofapreamplifierormixerto theXLRjacksor6.3mmjacksINPUTS(7,8). Bothjacksaredesignedforbalancedsignals;the pinconfigurationisshowninfig.2.However,also sourceswithunbalancedsignalsmaybecon- nected.Forthispurposetheconnectiontothe 6.3mmjackscaneasilybemadevia2-pole 6.3mmplugs. Theinputsignalshouldhavelinelevel.For ratedpoweroftheamplifieraninputsignalof1V isrequiredasaminimum. Forbridgemodeorparallelmodeonlyconnect theinputoftheleftchannelL-CH. TheXLRjack(7)isineachcasedirectlycon- nectedtothe6.3mmjack(8)ofthesamechan- nel.Thus,wh...