Clever Acoustics MA 4120 MKII User manual

MA 4120 MKII 480W
4 Zone Mixer Amplier
User Manual
Order code: CRAM33
MA 4120 MKII Mixer Amplier
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 1
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 2
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 3
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 4
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 5
-10 +10
-10 +10
-10 +10
010
PHONE
PHONE
VOLUME
MONITOR
VOLUME
010
VOLUME
ZONE 3
MONITOR
0
1
2
3
456
7
8
9
10
ZONE 1 ZONE 2
ZONE 4
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
ON
OFF
POWER
0
1
2
3
456
7
8
9
10
CH4 CH2
CH1CH3
L
R
CH5
LINE
POWER INPUT:
110-240V~50/60Hz
110-120V~60Hz - FUSE: T12A 250V
220-240V~50/60Hz - FUSE: T6.3A 250V
SERIAL NUMBER
www.cleveracoustics.co.uk
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN. NO USER
SERVICABLE PARTS INSIDE
MONITOR
LINE OUTPUT
G +
MONITOR
1W 8Ω
PRIORITY
– +
TEL PAGING
COM GNDHOT
110-120V~ 220-240V~
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
TEL
VOLUMEZONE
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 1 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 2 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 3 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 4 G – +
POWER CONSUMPTION (max.): 550W

www.cleveracoustics.co.uk MA 4120 480W Mixer Amplier User Manual
2
Safety advice
WARNING
FOR YOUR OWN SAFETY, PLEASE READ THIS USER MANUAL
CAREFULLY BEFORE YOUR INITIAL START-UP!
• Beforeyourinitialstart-up,pleasemakesurethatthereisnodamagecausedduringtransportation.
• Shouldtherebeanydamage,consultyourdealeranddonotusetheequipment.
• Tomaintaintheequipmentingoodworkingconditionandtoensuresafeoperation,itisnecessary
fortheusertofollowthesafetyinstructionsandwarningnoteswritteninthismanual.
• Pleasenotethatdamagescausedbyusermodicationstothisequipmentarenotsubjecttowarranty.
IMPORTANT:
The manufacturer will not accept liability for any resulting damages caused by the non-observance
of this manual or any unauthorised modication to the equipment.
OPERATING DETERMINATIONS
Ifthisequipmentisoperatedinanyotherway,thanthosedescribedinthismanual,theproductmaysufferdamageand
thewarrantybecomesvoid.Incorrectoperationmayleadtodangere.g:short-circuit,burnsandelectricshocksetc.
Donotendangeryourownsafetyandthesafetyofothers!
Incorrectinstallationorusecancauseseriousdamagetopeopleand/orproperty.
• Neverletthepowercablecomeintocontactwithother
cables.Handlethepowercableandallmainsvoltage
connectionswithparticularcaution!
• Neverremovewarningorinformativelabelsfromtheunit.
• Donotopentheequipmentanddonotmodifytheunit.
• Donotswitchtheequipmentonandoffinshortintervals,
asthiswillreducethesystem’slife.
• Onlyusetheequipmentindoors.
• Donotexposetoammablesources,liquidsorgases.
• Alwaysdisconnectthepowerfromthemainswhen
equipmentisnotinuseorbeforecleaning!Onlyhandle
thepower-cablebytheplug.Neverpullouttheplugby
pullingthepower-cable.
• Makesurethattheavailablevoltage
isbetween240V,50HzAC.
• Makesurethatthepowercableisnevercrimpedor
damaged.Checktheequipmentandthepowercable
periodically.
• Iftheequipmentisdroppedordamaged,disconnectthe
mainspowersupplyimmediatelyandhaveaqualied
engineerinspecttheequipmentbeforeoperatingagain.
• Iftheequipmenthasbeenexposedtodrastic
temperatureuctuation(e.g.aftertransportation),
donotconnectpowerorswitchitonimmediately.
Thearisingcondensationmightdamagetheequipment.
Leavetheequipmentswitchedoffuntilithasreached
roomtemperature.
• Ifyourproductfailstofunctioncorrectly,stopuse
immediately.Packtheunitsecurely(preferablyinthe
originalpackingmaterial),andreturnittoyourProlight
dealerforservice.
• Onlyusefusesofsametypeandrating.
• Repairs,servicingandpowerconnectionmustonlybe
carriedoutbyaqualiedtechnician.THISUNITCONTAINS
NOUSERSERVICEABLEPARTS.
• WARRANTY:Threeyearsfromdateofpurchase.
CAUTION!
KEEP THIS EQUIPMENT
AWAY FROM RAIN,
MOISTURE AND LIQUIDS
CAUTION!
TAKE CARE USING
THIS EQUIPMENT!
HIGH VOLTAGE-RISK
OF ELECTRIC SHOCK!!

www.cleveracoustics.co.uk MA 4120 480W Mixer Amplier User Manual
3
Product overview & technical specications
TheMA4120MKII4ZoneMixerAmplierisidealforsystemswheremultiplezonesarerequired.Designedfor
useinvenuessuchasschools,churches,entertainmentvenuesorcommercialbuildings,theMA4120MKII
offersmultizoneaudioroutingcoupledwithfourindependent120Wrmsampliers.TheMA4120MKII4zone
mixeramplierhasveinputchannels,eachwithselectableindependentoutputrouting,inputgain,treblebass
andvolumecontrols.Inputchannels1thru4areviaXLR/Jackcombosockets,eachwithLine/Mic/Mic+Phantom
selection,inputchannel5isviaastereolinelevelinput.
FouroutputzoneseachfeatureLEDVUindicators,monitorselectionandvolumecontrolswithoutputsforline
level,lowimpedance(4-8Ω)andconstantvoltagespeakersystems(25V,75V&100V).Theon-boardmonitor
facility,selectableforeachzoneoutputfeaturesbothalinelevelaudioand1W8Ωloudspeakeroutputsuitablefor
drivingaloudspeakerlocaltotheMA4120MKIIzonemixer.
•Fouroutputzoneseachwithlevelcontrolandmonitorselection
•Fourindependent120Wrmsamplifiersoutputtingto4-8Ωor25,70,100V
•Fiveinputchannels:
Channels1-4areviaXLR/Jackcombosockets,
eachwithLine/Mic/Mic+Phantomselection(48V)
Channels5isviaphono(RCA)stereolinelevelinput
•3U,19”rackmountchassis
•Inputgain,treble,bassandlevelcontrols
•Selectableoutputroutingforallinputchannels
•MonitorfunctionwithlevelcontrolandLEDVUmeter
•Outputformonitorloudspeaker:1W,8Ω
•Headphoneoutputwithlevelcontrol
•Telephone/paginginput(zoneselectable)withadjustablelevel
•Prioritycontactformusicmutefacility(CH4and5mute,CH1-3priority)
•VOXoperatedpriorityforTELinput
•CH1inputautomaticVOXpriority(internaljumperforpriorityoverride)
•TelephoneandMIC1(musicmutefacility)
•Inputchannelmuteswitchesonfrontpanel
•LinelevelMIXoutput
•Temperaturecontrolled,variablespeedfancooling
MA 4120 MKII 480W 4 Zone Mixer Amplier
MA 4120 MKII Mixer Amplier
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 1
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 2
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 3
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 4
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 5
-10 +10
-10 +10
-10 +10
010
PHONE
PHONE
VOLUME
MONITOR
VOLUME
010
VOLUME
ZONE 3
MONITOR
0
1
2
3
456
7
8
9
10
ZONE 1 ZONE 2
ZONE 4
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
ON
OFF
POWER
0
1
2
3
456
7
8
9
10
CH4 CH2
CH1CH3
L
R
CH5
LINE
POWER INPUT:
110-240V~50/60Hz
110-120V~60Hz - FUSE: T12A 250V
220-240V~50/60Hz - FUSE: T6.3A 250V
SERIAL NUMBER
www.cleveracoustics.co.uk
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN. NO USER
SERVICABLE PARTS INSIDE
MONITOR
LINE OUTPUT
G +
MONITOR
1W 8Ω
PRIORITY
– +
TEL PAGING
COM GNDHOT
110-120V~ 220-240V~
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
TEL
VOLUMEZONE
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 1 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 2 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 3 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 4 G – +
POWER CONSUMPTION (max.): 550W
Specications MA 4120 480W Mixer Amplier
Poweroutput 4x120Wrms(4x240Wpeak)
Speakeroutputs 25V,70V,100Vand4-8Ω
Sensitivity -CH1–4:—50dB(Mic/Phantom),
-10dB(Line)
-CH5:-10dB(unbalanced)
Frequencyresponse 60Hz-17kHz(±3dB)
Tonecontrol ±10dB-100Hz/±10dB-10kHz
(bass/treble)
S/Nratio >65dB(Mic),>75dB(Line),
>65dB(TEL)
THD <1%(@1kHz1Woutput)
Powerconsumption 550W(max.)
Powersupply 110-240V~50/60HzAC
Fuse T6.3A250V
Dimensions 135x484x395mm
Weight 22kg
Ordercode CRAM33
Z1
Z3
Z2
Z4
CH 1
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
Z3
Z2
Z4
CH 2
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
Z3
Z2
Z4
CH 3
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
Z3
Z2
Z4
CH 4
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
Z3
Z2
Z4
CH 5
0
1
2
3
456
7
8
9
100
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
010
PHONE
PHONE
VOLUME
MONITOR
VOLUME
010
VOLUME
ZONE 3
MONITOR
0
1
2
3
456
7
8
9
10
ZONE 1 ZONE 2
ZONE 4
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
ON
OFF
POWER
LF
HF
GAIN
LF
HF
GAIN
LF
HF
GAIN
LF
HF
GAIN
LF
HF
GAIN
MUTE MUTE MUTE MUTEMUTE
VOL VOL VO L VOL VOL
MA 4120 MKII Mixer Amplier
135mm
484mm 395mm

www.cleveracoustics.co.uk MA 4120 480W Mixer Amplier User Manual
4
Panel & connection identication
01-Gaincontrol
02-HFlevelcontrol
03-LFlevelcontrol
04-Muteswitch
05-MuteLED
06-Inputchannellevelcontrol
07-Zoneselectionswitches
08-Headphonelevelcontrol
09-Headphoneoutput
10-LEDVUoutputmeter
11-Monitorlevelcontrol
12-Zoneoutputlevelcontrol
13-Monitoroutputselector
14-PowerLED
15-Powerswitch
16-Coolingfan
17-ACmainspowerinput
18-ACmainsfuse
19-ACvoltageselector
20-Monitor(MIX)lineoutput
21-Monitorloudspeakeroutput
(1W8Ω)
22-Prioritycontrolterminals
23-Telephone/paginginput(TEL)
24-Telephone/paginginput
zoneselection&volumecontrol
25-StereoLINEinputs
26-MonoMIC/LINEinputs
27-Inputsensitivityandphantom
powercontrol
28-Balancedlinelevelzoneoutputs
29-Poweramplieroutputs
MA 4120 MKII Mixer Amplier
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 1
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 2
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 3
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 4
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 5
-10 +10
-10 +10
-10 +10
010
PHONE
PHONE
VOLUME
MONITOR
VOLUME
010
VOLUME
ZONE 3
MONITOR
0
1
2
3
456
7
8
9
10
ZONE 1 ZONE 2
ZONE 4
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
ON
OFF
POWER
0
1
2
3
456
7
8
9
10
CH4 CH2
CH1CH3
L
R
CH5
LINE
POWER INPUT:
110-240V~50/60Hz
110-120V~60Hz - FUSE: T12A 250V
220-240V~50/60Hz - FUSE: T6.3A 250V
SERIAL NUMBER
www.cleveracoustics.co.uk
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN. NO USER
SERVICABLE PARTS INSIDE
MONITOR
LINE OUTPUT
G +
MONITOR
1W 8Ω
PRIORITY
– +
TEL PAGING
COM GNDHOT
110-120V~ 220-240V~
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
TEL
VOLUMEZONE
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 1 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 2 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 3 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 4 G – +
POWER CONSUMPTION (max.): 550W
2524 28 29
19 20 21 22 23 26 27
16 17 18 26 27
MA 4120 MKII Mixer Amplier
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 1
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 2
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 3
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 4
0
1
2
3
456
7
8
9
10
-10 +10
-10 +10
-10 +10
Z1
VOL
BASS
MUTE
TREBLE
GAIN
Z3
Z2
Z4
CH 5
-10 +10
-10 +10
-10 +10
010
PHONE
PHONE
VOLUME
MONITOR
VOLUME
010
VOLUME
ZONE 3
MONITOR
0
1
2
3
456
7
8
9
10
ZONE 1 ZONE 2
ZONE 4
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
VOLUME
MONITOR
0
1
2
3
456
7
8
9
10
ON
OFF
POWER
0
1
2
3
456
7
8
9
10
CH4 CH2
CH1CH3
L
R
CH5
LINE
POWER INPUT:
110-240V~50/60Hz
110-120V~60Hz - FUSE: T12A 250V
220-240V~50/60Hz - FUSE: T6.3A 250V
SERIAL NUMBER
www.cleveracoustics.co.uk
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN. NO USER
SERVICABLE PARTS INSIDE
MONITOR
LINE OUTPUT
G +
MONITOR
1W 8Ω
PRIORITY
– +
TEL PAGING
COM GNDHOT
110-120V~ 220-240V~
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
PHANTOM
LINE MIC
TEL
VOLUMEZONE
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 1 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 2 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 3 G – +
LINE OUT - BAL/UNBAL POWER AMP OUTPUT
COM 4Ω 8Ω 25V 70V 100VZONE 4 G – +
POWER CONSUMPTION (max.): 550W
71 2 3 6 911 13 15
810 10 12 144 5

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5
Layout identication:
1. Gain control:
Thegaincontrolisusedtoadjusttheinputgain(level)foreachofthezonemixersinputchannels.Turn
thelevelcontrolanticlockwisetothelowestsetting,orturnclockwisetoadjusttothehighestsetting.
Adjustmentsshouldbemadegraduallytoavoidanysuddenchangestotheaudiooutput.Iftheaudio
sourceappearstosounddistorted,areductioningainmayberequired.
2. HF level control:
Duringinitialsetupthehighfrequencytoneadjustmentshouldbesettothezeropoint(12’o’clock
position).Turnthelevelcontrolanticlockwisetoreducethehighfrequencytones,orturnclockwise
toadjusttheincreasethehighfrequencytones.Adjustmentsshouldbemadegraduallytoavoidany
suddenchangestotheaudiooutput.
3. LF level control:
Duringinitialsetupthelowfrequencytoneadjustmentshouldbesettothezeropoint(12’o’clock
position).Turnthelevelcontrolanticlockwisetoreducethelowfrequencytones,orturnclockwise
toadjusttheincreasethehighfrequencytones.Adjustmentsshouldbemadegraduallytoavoidany
suddenchangestotheaudiooutput.
4. Mute switch:
Pressthemuteswitchtomute(silence)theselectedinputchannel.
5. Mute LED:
ThemuteLEDprovidesavisualindicationwhentheinputchannelisinmutestatus.
6. Input channel level control:
Thegaincontrolisusedtoadjusttheinputgain(level)foreachofthezonemixersinputchannels.Turn
thelevelcontrolanticlockwisetothelowestsetting,orturnclockwisetoadjusttothehighestsetting.
Adjustmentsshouldbemadegraduallytoavoidanysuddenchangestotheaudiooutput.Iftheaudio
sourceappearstosounddistorted,areductioningainmayberequired.Theinputchannellevelcontrol
adjuststheleveloftheselectedinputchannelwithinthemainmix.
7. Zone selection switches:
Eachoftheveinputchannelsmayberoutedtoanyofthefouroutputzones.
PresstheswitchtotheINpositiontoroutetheselectedinputchanneltothechosenoutputzone.
8. Headphone level control:
Theheadphoneoutputvolumeisadjustable.Turnthelevelcontrolanticlockwisetothelowestsetting,
orturnclockwisetoadjusttothehighestsetting.
9. Headphone output:
Utilisingastandard3.5mmstereojacksocket,theheadphoneoutputisusedalongsidethemonitor
functiontochecktheoutputofindividualoutputzones.Ifnoneoftheoutputzonesareselectedusing
themonitorselectionswitches,theheadphoneoutputwillbemuted.
Operating instructions

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6
Operating instructions
10. LED VU output meter:
Theoutputtoeachzonemaybemonitoredvisuallyontheamplier.TheVUmeterhasthreegreen
stages,followedbyamberandthenred.Careshouldbetakentoavoidthesignallevelreachingthe
amberorredzonesasthiswillindicateaclippedsignalwithinthezonemixer.Inthisinstance,theInput
Channeland/orZoneOutputLevelshouldbereduced.
11. Monitor level control:
Themonitoroutputvolumeisadjustable.Turnthelevelcontrolanticlockwisetothelowestsetting,
orturnclockwisetoadjusttothehighestsetting.Thisisusedtocontrolthevolumeforthe1W8Ω
loudspeakeroutputontherearpanelofthezonemixer.
12. Zone output level control:
Themastervolumecontrolaffectsallaudiosourceswithintheamplier,routedtotheselectedzone.
Turnthelevelcontrolanticlockwisetothelowestsetting,orturnclockwisetoadjusttheoveralloutput
tothehighestsetting.Adjustmentsshouldbemadegraduallytoavoidanysuddenchangestotheaudio
output.
13. Monitor output selector:
Torouteoneoftheoutputzonestothemonitor&headphoneoutputs,presstheMonitorselection
button.ThemonitoroutputvolumecanthenbeadjustedusingtheMonitorVolumeControl.
14. Power LED:
ThePowerLEDwillilluminatetoindicatethezonemixerispoweredon.IfthepowerLEDisnot
illuminated,checkrstthepositionoftheon/offswitchandthencheckthemains(includingfuse)orDC
powersupply.
15. Power switch:
On/Offcontrolforthezoneamplier.Note:Theon/offpowerswitchdoesnothaveanycontroloverthe
24VDCpowerinput.
16. Cooling fan:
TheMA4120MKIIisfancooled.Thecoolingfanwillstartwhentheinternaltemperaturesensor
reaches50°C.Thefanspeedwillvaryaccordingtotheinternaltemperatureoftheamplier.Donot
blockorobstructthefanportontherearpanelortheairventsonthetoporsidepanels.
17. AC mains power input:
Beforeconnectingtheampliertothelocalmainsvoltageoutletshouldbecheckedtoensurethe
availablesupplyis240V~AC50Hz.ThisproductisCLASS1andrequiresaprotectivemainsearthtobe
connectedatalltimes.DONOTremoveordisconnecttheearth.
18. AC mains fuse:
Disconnectfromthemainspowersupplybeforeattemptingtoreplacethemainsfuse.Replacement
mainsfusesmustbethesameratingastheoriginal.T6.3AL250Vfor220-240VACmainssupplyor
T12AL250Vfor110-120VACmainssupply.

www.cleveracoustics.co.uk MA 4120 480W Mixer Amplier User Manual
7
Operating instructions
19. AC voltage selector:
TheMA4120MKIIzonemixerfeaturesadualvoltagemainsinput.Disconnecttheunitfromthemains
voltagepowersupplybeforeattemptingtochangethemainsinputvoltage.Careshouldbetakento
selecttheappropriatemainsinputvoltagetomatchthatofthemainssupplyvoltage.
20. Monitor (MIX) line output:
Themonitorlineoutputcanbeusedtofeedexternalamplicationorrecordingequipment.TheMonitor
lineoutputprovidesanunbalanced(4V)signalfollowingthefrontpanel“monitor”selection.Ifseveral
zonesareselected,theoutputwillbeamixedsignalofalltheselectedzones.
21. Monitor loudspeaker output (1W 8Ω):
Auxiliaryconnectionfortheconnectionofasmallexternalloudspeakerforlocalmonitoringpurposes.
Thenominaloutputis1Wwithaminimumimpedanceof8Ω.Ifnoneoftheoutputzonesareselected
usingthemonitorselectionswitches,theheadphoneoutputwillbemuted.
22. Priority control terminals (Music Mute):
Whentheterminalsareshort-circuitedbymeansofaswitchorrelay(ierealarmpanel),input
channelsCH4andCH5willbemuted,leavinginputchannelsCH1,CH2andCH3withprioritystatus.
Note:TheTELinputcarrieshighestpriorityandwilloverridethePriority(MusicMute)function.
23. Telephone/paging input (TEL):
Foremergencypaging,theMA4120MKIIisequippedwithabalancedaudioTELinput,activated
automaticallyupontheMA4120MKIIdetectinganaudiosignalpresentontheTELinputterminals.
Theinputcarriesthehighestpriorityandwilloverrideallotherinputs&priorityfunctionson
theamplier.
24. Telephone/paging input zone selection & volume control:
TheTELinputfeatureszonecontrolandinputvolumecontrol.ToroutetheTELsignaltoadesired
outputzone,movethecorrespondingDIPswitchtothedown(ON)position.Theinputvolumeforthe
TELsignalmaybecontrolledbytherecessedvolumecontrolpotentiometer.Formostapplications,it
maybebestpracticetosettheminimumpossibleleveltopreventunwantedactivationofthepriority
input.Turnthepotentiometerclockwisetoincreasethevolume.
25. Stereo LINE inputs:
AstereoaudioinputisprovidedforsourcessuchasFMTuners,CDPlayersorMP3Players.Theinput
featuresapairofunbalancedphono(RCA)inputssuitableforlinelevelaudioinput.
26. Mono MIC/LINE inputs:
Channels1,2,3&4allfeaturemonoaudioinputs,eachwithselectorforusewithMIC/MIC+Phantom/
Linesignals.TheaudioinputisdesignedtoacceptabalancedaudiosignalviaXLRor6.35mm(¼”)
TRSjack.
Channel1featuresautomaticpriorityoverrideoverchannels2,3and4.Ifthisfeatureisnotrequired,
theusermustrefertoaservicetechnicianwhowillbeabletofollowtheinstructionsonpage9to
defeatthevoicepriorityfunction.

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Operating instructions
27. Input sensitivity and phantom power control:
Channels1,2,3&4eachfeatureswitchableinputsforusewithMIC/MIC+Phantom/Linesignals.The
MICposititionisdesignedtoacceptabalanced,lowlevelsignalfromastandarddynamicmicrophone
(5mV/1kΩ).ThePHANTOMpositionisdesignedtoprovide15VphantompoweracrossXLRpins2&3
forusewithcondensermicrophones.TheLINEpositionisforusewithlinelevelsourcessuchasradio
microphonereceivers,CDplayersandFMtuners(100mV/10kΩ),thesignalmaybeinputtedusing
eitherthebalancedXLRorbalancedTRS6.35mm(¼”)jack.
28. Balanced line level zone outputs:
TheMA4120MKIIfeaturesfour,independentzoneoutputseachutilisingbarrierstripterminalsforthe
balancedaudiooutput(1.7V).Thelineleveloutputsmaybeusedtofeedsignaltoexternalamplication
whereadditionalamplicationisrequired.Iftheamplierconnectedonlyrequiresanunbalancedsignal,
theoutputcontacts“+”and“G”shouldbeused.
29. Power amplier outputs:
EachofthefouroutputzonesontheMA4120MKIIfeaturesbothlowimpedanceandconstantvoltage
loudspeakeroutputs.Eachoutputzonemaybeusedtooutputintoeitherlowimpedance(4-8Ω)or
constantvoltage(25V,70V,100V).Donotusemorethanonepairofoutputterminalsonanyone
outputzone.Careshouldbetakenwhenconnectingtotheoutputstoensuretheloadimpedanceis
abovetheminimumloadspeciedfortheoutput.
Power on/off procedure:
Priortomakinganyconnectiontothemainspoweroraudioinputs/outputs,turnalllevelcontrols
counterclockwisetothe“0”positionandalltone(equaliser)controlstothemid(zero)point.Deselect
allmonitorandzoneselectioncontrols.
Switchonthezonemixerandanyaudiosources(MP3players,CDplayers,Microphonesetc)before
poweringthesystemsamplierON.Thelastproducttobeswitchedonshouldbethepower/slave
amplierstopreventanyunwantednoiseorpotentialdamagetospeakersorampliers.Ifyouwish
topoweroffthesystem,turntheamplier’smastervolumecontrolcounterclockwisetothe“0”
positionbeforeswitchingtheamplierOFFbeforeanyaudiosourcesareswitchedoff.Byfollowingthis
procedureitwillpreventacousticshockstothespeakersorpotentialdamagetosystemcomponents.
Afterconnectingallaudiosourcesandpoweringonthesystem,adjustthelevelofeachaudioinput,
selectthezoneroutinginordertoachievethedesired“mix”foreachzone.Careshouldbetaken
towhenadjustingmicrophoneinputvolumesandthemastervolume,adjustbothoftheseinsmall
increment’stoavoidfeedback(howlaround).Thegoalistoachieveaclearbalancebetweenmusicand
voiceensuringannouncementscanbeclearlyheard.

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Operating instructions
MIC priority:
DuringnormaloperationtheMA4120MKIIfeaturespriorityforMIC1overtheothermicrophoneand
lineinputs.Forcertainapplications,theinstallationengineermayneedtodefeattheMIC1priority
function.Inordertodothis,theproductmustbefullydisconnectedfromanyACorDCpowersources,
anddisconnectedfromallinputs/outputs.
Removethe15screwsfromtheoutercasingasperthediagrambelowandkeepinasafelocation.
Removetheuppercasingandplacetooneside.LocatethePCBtowardstherearoftheunitaspictured
below.Carefullymovethejumperfromthe"ON"positiontothe"OFF"position.Rettheoutercasing,
takingcaretoavoiddamagingtheunit.Retallofthescrewstofullysecuretheoutercasing.
TopofMixer
RearofMixer
Side1of
Mixer
Side2of
Mixer

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Typical panel connections
Mains
Recorder
PAAmplier
Recorder
CDPlayer
AM/FMTuner
DesktopMic
Microphone
Monitor
Speaker
Amplier
Contact
“VoicePriority”
Horn
speaker
Column
speaker
Speaker

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Rack installation:
TheMAseriesisrackmountable.Therackyouuseshouldbeadoubledoorrackwhereyoucanopen
thefrontandrearpanel.Whenmountingtheamplierintotherack,pleasemakesurethatthereis
enoughspacearoundtheamplier.
Becarefulwhenmountingtheamplierintotherack.Puttheheaviestproductsintothelowerpartof
therack.
Thefrontpanelisnotdesignedtoabsorbaccelerationforcesoccurringduringtransportation.
Inputs:
Shortcablesrunsimprovethesoundqualityremarkably.Inputcablesshouldbeshortanddirect,since
highfrequencieswillmostlybeabsorbedifthecablesareunnecessarilylong.Besidesthatalonger
cablemayleadtohummingandnoiseproblems.Ifthecablerunsareunavoidable,youshoulduse
balancedcables.
Outputs:
Thehighdampingfactorofyourampliersuppliesaclearsoundreproduction.Unnecessarilylongand
thincablesusedforlowimpedance(4-16Ω)speakerswillinuencethedampingfactorandthusthelow
frequenciesinanegativeway.Inordertosafeguardgoodsoundquality,thedampingfactorshouldlie
around50.Thelongeracablehastobethethickeritshouldbe.Forlongercablerunspleaseensure
the100Voutputsareusedfor100Vspeakers.
Connectyourspeakersystemsviathespeakerterminals(COM=-VE)
Examples: 1)COM+4-16Ω
  2)COM+70V
  3)COM+100V
Note:Pleasedonotusemorethanonepairofoutputterminalsonanyoneoutputzone.
Installation

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WEEE notice
Correct Disposal of this Product
(Waste Electrical & Electronic Equipment)
(Applicable in the European Union and other European countries
with separate collection systems)
Thismarkingshownontheproductoritsliterature,indicatesthatitshouldnotbedisposed
withotherhouseholdwastesattheendofitsworkinglife.Topreventpossibleharmtothe
environmentorhumanhealthfromuncontrolledwastedisposal,pleaseseparatethisfromother
typesofwastesandrecycleitresponsiblytopromotethesustainablereuseofmaterialresources.
Householdusersshouldcontacteithertheretailerwheretheypurchasedthisproduct,ortheir
localgovernmentofce,fordetailsofwhereandhowtheycantakethisitemforenvironmentally
saferecycling.
Businessusersshouldcontacttheirsupplierandcheckthetermsandconditionsofthe
purchasecontract.Thisproductshouldnotbemixedwithothercommercialwastesfordisposal.