JBL N500 Manuel utilisateur

JBL

DIVIDINGNETWORK

INSTRUCTIONMANUAL

JBL

PUBLICATIONOM22-3

James

Lansing

Sound, Inc. maintains a

Tech-

nical

Service

Department, to help JBL owners with

their

individual problems. If you cannot find the

answer

you need in published JBL literature or

obtain

it from your Audio Specialist, please

write

us.

All

JBL

precision

transducers are fully guaran-

teed

against defects in materials and workman-

ship.

Be sure to

fill

out and mail the warranty

card

immediately.

APPLICATION

JBL

precision

networks

usecircuitscarefullyde-

signed

give

imperceptible

transitionfrom

low

tohigh

frequency

transducers.

Unlike

ordinary

all-purpose

networks,

each

JBLcircuitisspecifi-

cally

engineered

match

the

characteristics

theJBL

transducers

with

whichitis

used,

and

should

notbe

connected

components

forwhich

isnot

designed.

Components

which

match

each

theJBLdividing

networks

arelistedinthe

table

below:

NETWORK

MODEL CROSSOVER

FREQUENCY LOW

FREQUENCY

TRANSDUCER

HIGH

FREQUENCY

TRANSDUCER

HIGH

FREQUENCY

CONTROL

INPUT

IMPEDANCE

(OHMS)

SHIPPING

WEIGHT

(LBS.)

N500 500 150-4's

150-4C 375 Strapping

Bar 16 16

LX5 500 LE15A

375,

LE175,

LE85

3-position

switch 8 10

LX7 500 LE14A LEI75

3-position

switch 8 10

N1200 1200

0130,

D131,

130A,130B's LE175

3-position

switch 8 9

LX10 1500 LE14A LE175 Continuously

variable 8 3

LX8 2000 LE14A LE20

3-position

switch 8 3

LX11 2500 LE10A LE20

3-position

switch 8 3

LX2 2500

D123,

D208,

D216 LE20 Continuously

variable 8 3

N2400 2500

D130,

0131,

D123 075 Continuously

variable 8 4

N7000 7000 Anytwo-way

system 075 Continuously

variable 4to16 3

SOPHISTICATED

CIRCUITRY

Dividing

networksareusedintwo-way

loud-

speaker

systemstoelectricallychannellow

tones

the

bass

loudspeakerand

high

notes

andover-

tones

tothe

high

frequencytransducer.

dividing

networkisto

fulfill

its

function

with-

out

compromise,itmustbeabletohandleextreme

variations

indynamics,the

full

rangeofaudio

frequencies,complextransients,andthe

varying

impedanceofa loudspeakerload.

JBL

dividing

networksare

carefully

designedto

complementtheexactcharacteristicsoftheJBL

transducers

with

which

theyaretobeused.Each

network

circuit

controlsthesignaltothe

high

andlowfrequencytransducersinsucha waythat

smooth

acoustic

response

ismaintainedthrough

the

full

audiospectrum.Thus,theeffectsof

indi-

vidual

speaker

characteristics,impedance

fluctua-

tions,

andthephysicalseparationofthetwosound

sources

arealltaken

into

accountinthecomplete

systemdesign.

Naturally,

suchsophisticatedengineeringde-

mandsveryclosetolerancesinproductionifallthe

benefitsofthedesignapproacharetoberealized.

Ordinary

networks,forexample,oftenuseelectro-

lytic

capacitors

with

tolerancesofplusorminus

20%.

Response

throughthecrossoverregionis

ragged,andcharacteristicsvary

from

unit

unit.

All

JBLnetworks,ontheotherhand,use

only

non-

inductive

paperormylardielectriccapacitors(not

electrolytic

units)

individually

testedtomeetJBL

tolerances.ThespecialinductorsusedinJBLnet-

works

haveextremelylowinsertionlosssothat

noneofthe

driving

powertotheloudspeaker

systemiswastedinthenetwork.Eachinductor

calibratedona sensitiveelectronicbridgeand

its

valuesetprecisely.TomeetJBLproduction

tolerances,networkcomponentsmustcheckout

within

plusorminus1%oftheestablisheddesign

value.

MOUNTINGINJBL

ENCLOSURES

JBL

dividing

networksarenormallyinstalledin

thebackpaneloftheloudspeakerenclosure.In

JBL

enclosures,theymaybeeasilyinstalleddi-

rectly

intothemountinghole

which

isprovided.

Make

sure

thatthewhitetubular

gasket

isinplace

aroundthenetworkflange.Centerthenetwork

into

themountingholeand

secure

driving

four

#6x %"round

head

wood

screws

intotheoutside

surfaceofthepanel.(To

install

the

LX4-2

net-

work

intothestandardcutout,theF2mounting

flange isrequired.)

MOUNTINGIN

CUSTOM

ENCLOSURES

Dimensionsfortherequiredmountingholeare

showninthediagram.(Tomountthe

LX4-2

acutoutofthissize,theF2mountingflange is

required.)

youmountthenetworkinthe

same

compart-

mentasthelowfrequencydriver,make

sure

that

themountingholeiscutexactly.Otherwise,the

white

tubularmounting

gasket

will

not

seal

prop-

erly,

andtheresultingairleaksmayintroduce

objectionable

hisses

andwhistlesintothesystem.

ADJUSTING

HIGH

FREQUENCY

GAIN

Since

thehighfrequencycharacteristicsofrooms

cannot

bepredicted,

each

JBL

dividing

network

isprovided

with

a highfrequencylevelcontrol,

which

makes

itpossibleto

achieve

a realistictonal

balance

under

a varietyofroomconditions.The

acoustics

ofyourlisteningroomandyourpersonal

listening

taste

will

dictatethesettingwhich

will

providethemostpleasingperformance.

Thecontrol

enables

youtoadjustthepowerfedto

thehighfrequency

transducer.

does

notaffect

the

crossover

frequency,nor

does

limit

the

upper

frequency

response

ofthe

loudspeaker

system.

Some

experimentation

with

thiscontrolisusually

necessary

whenthe

system

first

installedinits

permanent

location.Ifmusicalreproduction

seems

tobe

shrill

andedgy,turnthecontrolcounterclock-

wisetoa lowersetting.Ifit

seems

dead

and

dull,

turn

clockwisetoa highersetting.Comparative

listening

tests

shouldbe

made

attheusuallisten-

ing

location.

Once

thecontrolissetfor

best

overall

results,it

need

notbe

changed.

Youcancompen-

sate

foradditionaldifferencesin

source

material

with

yourpreamplifiercontrols.

THE

MODELN500

TheJBLN500

dividing

networkisa professional

unit

designed

primarilyfor

theater

installations.

isusuallymountedontopofthe

enclosure

some

othervisibleandconvenientlocation.

All

terminal

screws

lying

onthewhitelineare

common.Theoutput

screws

onthislineshouldbe

connected

totheblack

speaker

terminals.Thetwo

screws

marked"LF"areinternally

connected

thatconnectinganLFdriverto

each

setof

posts

effectively

connects

thedriversinparallel.

Thegainofthehighfrequencyunitmaybe

adjustedbychangingthepositionofthestrapping

bar.Zeropositionprovidesthemaximumintensity

level

oftheHFunit.Each

successive

step

lowers

theHFlevelonedb.

CONNECTING

JBL

NETWORKS

NETWORK

IMPEDANCE

All

JBL

dividing

net-

works

arematchedtothecharacteristicimpedance

the

transducers

with

which

theyare

used.

Model

N500

isa 16-ohmnetworkandshouldbeconnected

the16-ohmamplifiertapformostefficientpower

transfer.AllotherJBLnetworks

will

operate

most

efficiently

whenconnectedtothe8-ohmamplifier

tap,althoughthe4-ohmorthe16-ohmtapcanbe

used

without

danger

damage

toamplifieror

loud-

speakers.

WIRE

SIZESInfactory-installedJBL

systems,

18-gage

strandedinsulated

wire

used

forconnec-

tion

ofcomponents.Inhomeinstallations,

18-gage

strandedor

solid

wire

orordinarycommercial

lampcord

maybe

used

forspeaker-amplifiercon-

nectionsupto50feet.

CONNECTING

AMPLIFIER

Fasten

the

leads

from

youramplifiertothetwopush-type

terminal

posts

onthefaceofthe

dividing

network.

The"B"orblackpost

connects

totheblack,or

common,

lead.The"R"orredpost

connects

tothe

8or16ohmamplifiertap.Nosolderingisrequired.

Simply

depress

thecoloredbutton,insertthe

bare

endofthelead

wire,

and

release.

CONNECTING

TOSPEAKERSMostJBLnet-

works

aremountedonanescutcheonplate

which

fits

intothestandardmountingcutoutonthe

enclosure.Leadwires

from

the

speakers

are

broughtouttothepush-typeterminal

posts

thepanelthrough

eyelets

intheescutcheonplate.

Properconnectionsof

speakers

tothevariousJBL

networksareexplainedbelow.

Care

shouldbetaken

connectinginstructionsexactlyto

ensure

thatthesystem

will

operate

phase:

thatis,so

thata signal

from

theamplifier

will

cause

both

diaphragmstomoveinthe

same

directionatthe

same

time.

CONNECTING

THELX11Emergingfromthe

chassis

oftheLX11networkarefourwires:two

black,one

green

andonered.

Connect

the

green

wire

totheredterminal

post

oftheLE10Alow

frequency

loudspeaker.

Connect

theredwireto

theredterminal

post

oftheLE20highfrequency

transducer.

Connect

theblackwirestotheblack

posts

ofthe

speakers.

Since

these

twowiresare

connected

intheinternalcircuitryofthe

net-

work,

either

blackwiremaybe

connected

either

speaker.

CONNECTING

THELX8TheLX8networkis

connected

inthe

same

wayastheLX11.

Connect

the

green

wiretotheredterminal

post

ofthe

LE14A

lowfrequency

loudspeaker.

Connect

the

redwiretotheredterminal

post

oftheLE20high

frequency

transducer.

Connect

theblackwiresto

theblack

posts

ofthe

speakers

—

either

wireto

either

speaker.

CONNECTING

THEN400,N1200,N2400andLX2.

Each

these

fourdividingnetworksis

connected

showninthediagrambelow:

CONNECTING

THELX5,LX13,andLX10.

These

networksare

connected

speakers

asshowninthe

diagrambelow:

ExtendedRange

orlowfrequency

speaker

Highfrequency

transducer

network

ToAmplifier

Lowfrequency

speaker

Highfrequency

transducerand

hornorhorn/lens

Network

ToAmplifier

CONNECTING

THEN7000TheN7000

divid-

ing

networkprovidesa

means

ofaddingthe075to

existing

high-quality

two-way

loudspeaker

sys-

tems

toobtainadded

brilliance

inthevery

high

frequencies.Itisconnectedtothe

high

frequency

terminals

ofthemain

dividing

networkasshown

thediagramsbelow:

Main

Network

Amplifier

Lowfrequency

speaker

075

.N400,

N500orN1200

Main

Network

Amplifier

Lowfrequency

speaker

075

LX5

orLX7

JAMESB.LANSINGSOUND,INC.,

3249

CASITAS

AVE.,LOS

ANGELES

39,

CALIF.

Highfrequency

transducerand

hornorhorn/lens

Highfrequency

transducerand

hornorhorn/lens

N7000

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