APart-Audio PM7400 MKII Assembly instructions

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MANUAL
PM7400 MKII Professional two-zone stereo pre-amplifier/mixer

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Caution:hotandsharpsurfaces!Thisprofessionaldeviceneedstobeinstalledbyqualifiedper-
sonnelonly.
Pleasecheckthepackingforanykindofdamageuponreceptionofthegoods.Ifthepackingis
damaged,pleasecontactyourdealerbeforeopeningit.
!!!!Danger!!!!Exposuretohighsoundpressurelevelsmaycausepermanenthearingloss.Hear-
inglossinducedbyexposuretohighsoundpressurelevelswillvaryfromindividualtoindividual,
butnearlyeveryonewilllosesomehearingwhenexposedforasufficientamountoftime.There-
foreitisrecommendedthatallpersonsexposedtoequipmentcapableofproducinghighsound
pressurelevels,suchasthisamplifier,wearsufficientearprotectionwhileinstallingoroperating
thisunit.
Readalldocumentationbeforeoperatingyourequipment.
Keepalldocumentationforfuturereference.
Keepthecartonandpackingmaterial,eveniftheequipmenthasarrivedingoodcondition.
Shouldyoueverneedtosendtheunitback,useonlytheoriginalfactorypacking.
Donotspillwaterorotherliquidsonorintotheunit.
Makesurepoweroutletsconformtothepowerrequirementslistedonthebackoftheunit.
Donotusetheunitiftheelectricalpowercordisdamaged.
AlwaysoperatetheunitwiththeACgroundwireconnectedtotheelectricalsystemground.
Turnthelevelcontrolsontheamplifiersallthewaydownduringpower-uptopreventspeaker
damageiftherearehighsignallevelsattheinputs.
Donotconnecttheinputs/outputsofamplifiersorconsolestoanyothervoltagesource,such
asbatteries,mainssourcesorpowersupplies,regardlessofwhethertheamplifierorconsoleis
turnedONorOFF.
Powerdownanddisconnectunitsfrommainsvoltagebeforemakingconnections.
Donotusetheunitnearstoves,heatregisters,radiators,orotherheatproducingdevices.
Donotoperateequipmentonasurfaceorinanenvironmentwhichmaydistortthenormalflowof
airaroundtheunit.Iftheunitisusedinanextremelydustyorsmokyenvironment,theunitshould
regularlybe“blownfree”ofdust.
Donotremovethecover.Removingthecoverwillexposeyoutopotentiallydangerousvolt-ages.
Donotdrivetheinputswithasignallevelhigherthanthatwhichisrequiredtodriveequipmentto
fulloutput.
Donotruntheoutputofanyamplifierbackintoanotherinput.
Incaseofmalfunction,thisdeviceshouldbeservicedbyqualifiedservicepersonnelonly.
Safetyfirst!

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•Youcanmixspokenmicrophonemessageswithmusicindifferentways.
•1.Mixthemicrophonesignalswiththemusicbysettingthemicandlinelevelvolumecontrol-
lerstoanappropriatelevel.Inordertodothis,theVox/Ext.muteswitchshouldnotbepressed
inandthemutecontactatthebackshouldbeopen.Youwillnoticethatyouhavetopushthe
microphoneleveltoaveryhighlevel.Thisisnotrecommended.
•2.Mixthemicrophonesignalofmic1withthemusicusingthe‘vox’or‘voice-over’circuitry:
TheVox/Ext.muteswitchmustbepressedin,andthemutecontactatthebackmustbeopen.
Bysettingthemic1andvoxmutelevelatthebacktoanappropriatelevel,youcancreatean
automaticmusicmutingbytalkingintomic1.Thisisnotvalidforthemic2input,i.e.mic2
signalscannotactivatethevoxcircuitry.
•3.Byclosingtheexternalmutecontactattheback,youwillmutethemusicsignal.Nowyou
canspeakintomic1ormic2.Themutingcircuitrywillonlymutethemusicsignalsandallow
themicsignalstopassthrough.Thiswayyoucancreateamicrophoneprioritysystemeasily.
Pleasenotethattheexternalmutecontactatthebackcanonlybeconnectedtoaswitch.
Neverapplyanyvoltagestotheexternalmutecontacts!
Features
Howtomixmusicandmicrophonesignals?
•2zonestereomixer,1balancedlineoutputand1unbalancedlineoutputwithindividual
volumecontrols
•6lineinputs,1balanced(XLR),5unbalanced(RCA)
•2balancedmicrophoneinputswithswitchablephantompower
•Switchablevoxmuteonmic1withadjustablemusicmutelevel
•Microphoneprioritycontact
•3bandtonecontrolforlineandmicinputs
•Toroidalpowertransformer
•Mono/stereoswitch
•19inchrackmountablewithfixedrack-ears

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1)Microphone1input:balancedjackinput.Thisisthesameinputasthemicrophone1comboXLR/
jackattheback.Thismichasaswitchablevoxcircuitwithadjustablemusicmutelevel.Thisway,a
spokenmessagewillsuppressthemusic.Alternatively,youcanusetheprioritycontactsattheback.
Closingthecontactswillmutethemusic.Phantompowerisavailable.Thereforeyouneedtoclosethe
phantompowerdipswitchatthebackoftheunit.Phantompowerisswitchedoffbydefault.Mic1will
beheardinbothoutputzones.
2)Mutemodeswitch:bypressingthisswitchin,thevoxmodeisactiveonmic1only.Thevoxmutelevel
canbesetviaapotmeteronthebackoftheunit.
3)Mic1volumecontrol:thisvolumecontroladjuststhemic1level.
4)Mic2volumecontrol:thisvolumecontroladjuststhemic2level.
5)Microphone2input:balancedjackinput.Thisisthesameinputasthemicrophone2comboXLR/jack
attheback.Youcanusetheprioritycontactsatthebacktomutethemusicwhilespeaking.Closing
thecontactswillmutethemusic.Phantompowerisavailable.Thereforeyouneedtoclosethephan-
tompowerdipswitchatthebackoftheunit.Phantompowerisswitchedoffbydefault.Mic2willbe
heardinbothoutputzones.
6)Microphonebasstonecontrol:forbetterspeechintelligibility,turnthemicrophonebasscontroldown
alittle.
7)Microphonemidtonecontrol:forbetterspeechintelligibility,turnthemicrophonemidcontrolupa
littleifnecessary.Ifyouexperiencefeedback,turnthetonecontroldown.
8)Microphonetrebletonecontrol:forbetterspeechintelligibility,turnthemicrophonetreblecontrolupa
littleifnecessary.Ifyouexperiencefeedback,turnthetonecontroldown.
9)Powerswitch:fliptheswitchtopoweron/offtheunit.TheblueLEDlightsupwhenthepowerison.
10)Lineinputs(music)basstonecontrol.
11)Lineinputs(music)midtonecontrol.
12)Lineinputs(music)trebletonecontrol.
13)Lineinputs(music)volumecontrol.Normally,setthiscontrolfullyopen.Ifyouwanttoadjustthemusic
levelrelativetothemicrophonelevel,usethiscontrol.Caution:whenthelineinputvolumecontrolis
settothe0position,nomusicwillbeheard.
14)Lineinputselector:turnthisknobtoselectlineinputs1to6.
15)Zone1volumecontrol:adjustthevolumeofzone1.Thegreenledslightupwhenasufficientlystrong
signalispresent.
16)Zone2volumecontrol:adjustthevolumeofzone2.Thegreenledslightupwhenasufficientlystrong
signalispresent.

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1)GNDconnection:connectanadditionalgroundwirehereifnecessary.
2)Line1balancedrightchannelinputonXLR.
3)Line1balancedleftchannelinputonXLR.
4)Line2unbalancedL/RinputonRCAconnectors.
5)Line3unbalancedL/RinputonRCAconnectors.
6)Line4unbalancedL/RinputonRCAconnectors.
7)Line5unbalancedL/RinputonRCAconnectors.
8)Line6unbalancedL/RinputonRCAconnectors.
9)Zone1unbalancedlineoutputonRCAconnectors.
10)Mono/stereo,GNDliftandphantompowerdipswitches.Formonooperationinbothzones,flip
dipswitch1totheonposition(down).Dipswitch2isnormallytotheonposition:ifyouwanttosepa-
ratetheaudiogroundfromsafetyground,flipthisswitchup.Dipswitch3and4activatethephantom
powerformic2ormic1whenswitchedon.
11)Externalmutecontacts:closethesecontactstomutethemusicformicrophone1-2priority.Donotap-
plyanyforeignvoltagetotheseconnectors.Connectapotentialfreecontactonly!
12)Voxmutelevelcontrol:turnthiscontroltosetthemicrophone1activatedvoxcircuitmutelevel.This
controlhasnofunctionwhenthefrontmuteswitchisnotpressedtotheinposition.
13)Zone2rightbalancedrightchanneloutputonXLR.
14)Zone2leftbalancedleftchanneloutputonXLR.
15)Microphone2input:balancedXLR/jackcomboinput.Thisisthesameinputasthemicrophone2jack
atthefront.Youcanusetheprioritycontactsatthebacktomutethemusicwhilespeaking.Closingthe
contactswillmutethemusic.
16)Microphone1input:balancedXLR/jackcomboinput.Thisisthesameinputasthemicrophone1jack
atthefront.Thismichasaswitchablevoxcircuitwithadjustablemutelevel.Thisway,aspokenmes-
sagewillsuppressthemusic.Alternatively,youcanusetheprioritycontactsattheback(11).Closing
thecontactswillmutethemusic.
17)Powercordreceptaclewithbuiltinmainsfuse:connectthepowercordhere.Mainsvoltageis230
VAC/50-60Hz.Themainsfuseislocatedinsidethisconnectorandcanbereachedwithoutopening
theunit.Whenthefuseisbroken,replaceonlywithafuseofthesamevoltageandcurrentrating.Fuse
rating:315mAT/250V.

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Inputs line level Balanced stereo inputs on XLR, 5 x unbalanced
stereo on RCA
Inputs mic level 2 x balanced on jack and combo jack / XLR
Input sensitivity line inputs 500 mV
Input sensitivity mic inputs 5 mV
Input impedance line inputs 10 KΩ
Input impedance mic inputs 500 Ω
Phantom power supply Approx 15V, switchable via dipswitches for MIC1
and MIC2
Outputs Stereo unbalanced ZONE1 on RCA
Stereo balanced ZONE2 on XLR
Output impedance <600 Ω
Nominal output level 1V / 0dBV
Liftable ground yes, via dipswitch
Mono / Stereo switch yes, via dipswitch
S/N ratio line inputs >90 dB A weighted
S/N ratio mic inputs >70 dB A weighted
THD <0.1%
Frequency response 20-25 Khz +0/-3dB
Tone controls 80Hz, 1.5KHz, 10KHz / up to 12dB attenuation /
boost
Channel separation >70dB @ 1KHz
Max power consumption 10VA
Mains operating voltage 230VAC / 50-60Hz
Fuse rating 315mAT/250V
Dimensions 48.3 x 4.4 x 27.5 CM (without rubber feet)
Net weight 2.6Kg
TechnicalSpecifications

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They are well appreciated and eventually
rewarded!
Send your ideas or suggestions to
[email protected]
PM7400MKII is developed by
Audioprof nv
Industriepark Brechtsebaan 8 bus 1
BE-2900 Schoten
BELGIUM
Company names, product names, and names of formats etc. are the trademarks
or registered trademarks of their respective owners.
© 2011 APart-Audio specifications subject to change without notice.