oport
bracket
is
secured
with
a
clamptothefront-to-rearbrace
;he
4350enclosure.Removalisaccomplishedby
unbolting
jclamp
from
theenclosurebrace,takingoutthefour
screws
'•ng
through
thebafflepaneltothehornflange,
and
lifting
^.ver/horn/bracketassembly
from
theenclosureThehorn
dbracketcanthenbeunbolted
from
thecompression
ver
Caution
To
avoidthepossibilityofpersonalinjury,besure
oroperiysupportthednver/horn/bracketassemblywhile
novingthe
mounting
screws
holdingthehorntothebaffle
iei.
sincetheassemblyweighsapproximatelyl3HKg[30lb)
*oconvertthe4350toright-handconfiguration,toehigh
quercydnve'/horn/bracketassembly
wilt
havetobe
archanged
with
itscorrespondingcoverplateonthe
right
of
bafflepanel.(The2405ultra-highfrequencydriverw:lialso
/e
tobeinterchanged
with
itsrespectivecoverplate,as
scribed
inthe
following
paragraphs)Thecoverplateis
;uredbehindthebaffle
panel
byfourmachine
screws
threaded
•>
T-nuts.
The
supportbracketmustbe
taken
offthednver/horn
;embly.rotatedt80°andreattachedtotherearflangeofthe
musingtheoriginalhardware(lockwasnersareusedunder
heads
oltnetwoooltsthatsecurethe©racket}Theentire
;emoiycanthenbeinsta'ieconthebaffiepanelandthe
jport
bracketclamp
bolted
totheinternalbraceonthe
right
e
ofthe
enclosure.
Finally,installthecoverplatebehindthe
•ncutoutonthe
left
sideofthebafflepaneiusingthe
screws
theiditinitsoriginallocation.
"-High
Frequency-The
2405ultra-highfrequencydriveris
,d
through
thebafflepanel
from
insidetheenclosureand
leldinplacebyfourmachine
screws.
To
achieve
tnedesired
persionpatternthe
unit
mustbepositionedsothatthe
ractionslotisorientedvertically.
Vhen
movingthe2405totheright-handconfigurationthe
respondingcoverplateonthe
right
sideofthebaffiepanel
st
beremovedandreinstalledbehindtheopeningoriginally
:upiedbytheultra-nighfreauencydriverThecoverplateis
dmplace
with
tour
machine
screws
threadednto
T-nuts
The
ne
mounting
screws
aretobeusedtoinstallthecoverplate
the
left
sideofthebaffiepane!.
iding Network-Remove thetransducersaspreviously
icribed.
pull
theleadwires
from
themidrangesub-chamber
]
disconnectthe
input
leadstothedividingnetworkatthetab
inectorsattachedtothe
input
terminalsonthebackpanel,
detheenclosure.Theultra-highfrequencyieveicontrolis
untedona sub-panelsecuredtotnebackoftheenclosure
fiepanelby
two
machine
screws
extending
through
thepanel
)
threadedfasteners
To
gam
access
totnecontro
.
carefully
j|oftthe
serialized
foil
namepiate.removethe
mounting
ews
andplacetnecontrolassemblyonthe
bottom
ofthe
:losure.
Thenetworkitselfismountedonthe
bottom
pane;of
encosure
andisheldinplacebysixmachine
screws
and
Afterremovingthe
mounting
screws,
thenetworKano
molassemblycanoe
lifted
outoftheenclosure
through
er
ofthelowfreauencyloudspeakeropenings
e:
Malfunctionofthe
networK
ishighlyunlikely.
Since
the
namepiategenerallyisdestroyedirremoval,tt;snotrecom-
mendedthatthenetworkberemovedsimplyforthepurpose
ofinspection
Replacement-
Reverse
theremova:proceduretoreplacethe
system
components.
Mounting
screws
forall
devices
shouldbe
tightenedevenlyandiust
tight
enoughtopreventairleaks
AlthoughJBLloudspeakersareextremelyrugged,theconeandother
movingpartsaresubjecttoaccidentaldamage.
Exercise
extreme
cautionwhenever
using
a screwdriverorothertoolsIntheirimmediate
vicinity.Wheneverthehornisremovedfromthe
compression
driver,
themouthofthedriver
should
becoveredwith
plastic
tape.Anintense
magneticfieldexistsinthemoutholthedriver,andItisextremely
Importantthatforeignobjects
such
asIron
chips,
othermetallic
contaminants,
mountinghardwareortoolsbekeptfromthearea.
Maintenance
The
grilleclothisa double-knitpolyesterfabricselectedfor
acoustic
transparency,
beauty,physica'strength,color
fastness
andsod
resisiance
Itcanbecleanedbygentlydustingit
with
a
vacuum
cleanerStainscanberemovedbyusingaerosol
cieaners.
suchas
Texize
K2r Goddard'sDry
Clean,
or Pen
Champ
Quick
'n
Easy
accordingtoeacnmanufacturers
instructions.
Warning:Cleaningfluidsorother
solvents
should
notbe
used.
Although
theymayappeartoremovea stain,liquidcleanerswilldissolvethe
base
paintonthegrilleframebeneaththe
cloth,
resultinginpermanent
discoloration
ofthematerial.
Occasional
dusting
with
a
clean,
softclothwillmaintanthe
finishoftheenclosure
Since
both
thetexturedgrayandoiled
wainut
surfaces
aremoisture
resistant,
adamp
c<oth
willremove
moststains
Mild
detergentmaybeusedonthegrayfinishto
removesmudgesormorepersistent
stains.
Conventional
furniture
waxes
orpolishesshouldnotbe
used;
tneoiledwalnut
enclosure,
however,maybetreated
with
waxspecifically
formulatedforsuchsurfaces
The
walnutfinishmayappearto
age.
ordryoutastheoil
penetratesdeeperanddeeper
into
theveneeritmay,therefore
bedesirabletore-oiltheenclosuresurface
from
timetotime.
Witheachapplication,theoeautyofthefinishwillbecomemore
obvious,anda warm,richpatinawiileventualy beobtained
To
re-oila
JBL
oiledwalnutfinisnuseanyoneofme
severa
clear
oilfinishingpreparationsavailable
through
furnitureor
hardwareoutlets.Applya liberalamountoftheoreparationover
theentirefinishedsurfaceoftheenclosure.Intentofifteen
minuteswipeofftheremainingoil
with
a soft,
clean,
drycloth
Sma/
surface
scratches
can
usuallyberemovedbygently
rubbingthem
witn
veryfinesieelwool(4/0grade)ancapplying
oiltotheentirepanel
Very
deep
scratches,
dentsorotherserious
damageshouldoerepairedonlyoy
a
Qualifiedfurniturerefmtsner
Caution:
ImproperstorageofwipingragscouldresultInspontaneous
combustion.
Theyshouldbethrownawayorspreadouttodryina
well-ventilatedareabeforestorageor
disposal.
