JBL 4301E Manual

JBL
4301E
INSTALLATION
AND SERVICE
MANUAL

TheJBL4301Eisa self-containedamplifier/monitor
loudspeakersystem,compactinsizeanddesignedfor
mobilerecording,broadcasting,editingapplications,
orwhereverspaceisa premium.
LoudspeakerSpecifications
AmplifierSpecifications
Installation
Placement
Locatingthesystemsothatthehighfrequencyunitis
nearearlevelgivesthebestresults.Forbeststereoimaging,
thelisteningpositionshouldbebetweenthetwosystemsat
theapexofanangleof40°
ConnectingtheSystem
Loudspeakerconnectionsaremadeatthetwoscrew
terminalslocatedonthebackoftheenclosure.Maintain
consistentpolaritywhenconnectingtheloudspeaker
systems.
CAUTIONTheamplifierpowermustbedisconnected
whenmakingorbreakingaudioconnectionstothe
system. Makingorbreakingconnectionswhilethe
amplifierisoperatingcould'seriouslydamagethe
loudspeakerandvoidthewarranty.
AdjustingtheSystem
Acontinuouslyvariablehighfrequencylevelcontroladjusts
theoutputofthehighfrequencyloudspeakertocompensate
forroomacoustics.Thecontrolscaleismarkedwith0
representinguniformresponseina reverberation-free
environment:specialsettingscanbeloggedandeasilyreset
whenneeded.
Maintenance
Thegrilleissecuredtotheenclosurebydowelpinslocated
nearthecornersoftheenclosure.Toremovethegrille,grasp
itbythetopandbottomcornersoftheenclosureandpull
gently.Toreplaceit,repositionitonthedowelpinsand
presslightly.
Thegrilleclothisa double-knitpolyesterfabricselectedfor
acoustictransparency,beauty,strength,colorfastnessand
soilresistance.Itcanbecleanedbygentlydustingitwitha
vacuumcleaner.Stainsmayberemovedbyusingaerosol
cleanerssuchasTexizeK2r.Goddard'sDRYCLEAN,or
PenChampQUICKN EASY,accordingtothemanu-
facturer'sdirections.
CAUTIONTheuseofcleaningfluidsorothersolvents
willresultinpermanentdiscolorationofthegrillefabric.
Occasionaldustingwitha clean,softclothwillmaintainthe
finishoftheenclosure.Becausetheoiledwalnutsurfaceis
moistureresistant,a dampclothwillremovemoststains.
Conventionalfurniturewaxesorpolishesshouldnotbe
used, buttheenclosuremaybetreatedwitha waxspecially
formulatedforsuchsurfaces.
Thewalnutfinishmayappeartodryoutastheoil
penetratesdeeperintotheveneer.Manyownerstherefore
re-oiltheenclosurefromtimetotime.Witheachapplication
ofoilthebeautyofthefinishwillbeenhancedanda rich,
warmpatinawilleventuallyappear.
Tore-oiltheenclosure,useanyofseveralclearoil
finishingpreparationsavailableatfurnitureorhardware
stores.Applya liberalamountoftheoilovertheentire
surfaceoftheveneer.After15minutes,wipethesurface
witha clean,soft,drycloth.
Smallsurfacescratchescanusuallyberemovedbygently
rubbingthemoutwitha #4/0steelwoolandapplyingoil
tothewholepanel.Whenusingsteelwool,pressverylightly
andrubonlyinthedirectionofthegrain.Deepscratches
orseriousdamageshouldberepairedonlybya qualified
furniturerefinisher.
FrequencyResponse
SineWave.On-axis 45Hzto15kHz± 3 dB
/3-Octave Band -3dBe 50Hz
(400Hzreference) OdBe 1.2kHz
+2 dB§ 12kHz
PolarResponse Nolessthan-6dB@ 90°
horizontalandverticalto10kHz.
CrossoverFrequency 2.5kHz
InputSensitivity 0.5Vrms
PowerOutput 10W continuoussinewave(8-flload)
THD:e RatedOutput 0.05%orless
@ 1 W 0.02%orless
S/Ne RatedOutput betterthan90dB
FrequencyResponse 10 11/ to15kHz± 0.5dB
PowerSupply 120VAC.50/60Hz
InputImpedance 25kfl
HIGHFREQUENCYLEVEL

Notes[unlessotherwisespecified)
E3ResistorR12selectedfor< 50mVoff-setvoltage.
;Allresistorsarefixed,metal-film,< 5%, % W unlessnoted.
E3Capacitors aretantalum.
ESCapacitorsaremica.,
>Allcapacitorvaluesareinmicrofarads.
3103ComponentLocation
WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY
6001ComponentLocation VoltageTestPoints
andComponentLocation
forthe6001CircuitBoard.
6001/3103Schematic

WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY.
RECOMMENDEDTESTEQUIPMENT
InstrumentType RequiredCharacteristic RecommendedInstrument
DistortionAnalyzer Measurableto0.002% 'SoundTechnologyModel1700A
OutputLoadResistor 12.5W,8 n,Non-inductivetype.1% DaleNH-12.5
ResistorDecadeBox 1n-1knmin.EIAStandard
VariableAutotransformer Capableofsupplying25W overa rangeof90-136V.
1. Ifautotransformer,doesnothaveanACvoltmeter,monitor
theoutputvoltagewitheitherthemultimeterindicatedbelow,
•oranACvoltmeterwitha rangeof90-136VAC.
2. Iftheautotransformerdoesnothavea wattmeter,a watt
metercapableofindicating25wattswillberequired.
GenRadW5MT3AW
Multimeter Accuracy:± 0.1%reading+ 1 count
DCRange:± 199.9mVto± 1199.0V
ACRange:0.2VACto1200VAC
InputResistance:10Mfi
20kHzEquivalentBandwidthFilter
Item JBLPartNo. Qty. Description
1 51517 4 6
x % x 1
ovalhead,crossed-recessedsheetmetalscrew
2 52014 4
8-32x1%
flathead,crossed-recessedmachinescrew
3 58397 4 10x1x!4 flathead,crossed-recessedsheetmetalscrew
4 57307 4
No. 10 speednut
5 6001 1 amplifier
6 3103 1 crossovernetwork
7 52192 1 knob
8116A1
9 52671
1
reargasket
10 33841
4
10-32x1 flathead,crossed-recessedmachinescrew
11
LE25-2 1
12 56355 1 grilleassembly
UBL ProfessionalDivision
JamesB.LansingSound,Inc.,8500BalboaBoulevard,Northridge,California91329 U.S.A.
580274301EPTM-8/78PRINTEDIN U.S.A.