Dayton MCA3545 Doll User Manual


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Frequency Response Graphs
Thesegraphsshowthefrequencyresponseofeachcrossoverpointfor
boththelowfrequency(woofer)andhighfrequency(tweeter).Eachgraph
alsoshowstheeffectofthe“boost”circuitforeachlowfrequencycrossover
point.Note:Asyoucanseefromthegraphsthecrossoverpointsarehigher
whentheboostcircuitisactivated.
Jumper Settings
TheMCA3545hasuserselectablehighandlowfrequencycrossoverpoints
whichmaketheamplierextremelyversatile.Theunithas5crossover
pointsthatfeature24dB/octaveslopeandareselectedusingjumpertype
connectors.Fig1showslocationofcrossoverpointsonthepreampboard
alongwiththepropermethodofconnectingthejumpers.
Note:Thefactorysettingis3.8KHzforboththetweeterandwoofercircuits.
Boththehigh(Tweeter)andlowfrequency(Woofer)crossovercircuitshave
theirownjumpers.Thismakesitpossiblefortheusertoselectdifferent
crossoverpointsforthe“tweeter”versesthe“woofer”circuits.The“tweeter”
connectionsarealwaysthetwoleftpinsforeachcrossoverpoint.
Note:Onlyonecrossoverpointshouldbeselectedforeachcircuit(tweeter
orwoofer).
Low Frequency Boost
Thelowfrequencycircuitalsofeaturesaswitchableboostsetting.Theboost
circuitaddsroughly3dBofgainthroughoutthelowfrequencyrange.Becauseof
thisthecrossoverpointsforeachsettingarehigherwhentheboostisactivated.
Note:Thefactorysettingfortheboostcircuitis“OFF”.Whenactivatingthe
boostboth“Boost”jumpersmustbeinthe“ON”position.Theboostcircuitonly
effectsthelowfrequencyresponse.
Pre Amp Board
Fig. 1
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