JBL L7 Guide de configuration

L7 Ovvneds

ManualSupplement

Sped<erPlacement

Bi-Wiring andB¡jAnplification

g' 3'

side-mounted

woofers faceinward

Drawing

L-B

- L7

position

frontview

é,

L7 Placement

Drawing

L-Aand

L-B

show

optimal

placement

foryourL7

loudspeakers.

Note thatthe

speakers'

side-mounted

woofers

should

beplaced

inwards

towards

thecenter

oftheroom.

Bi-wiring

TheL7's

outerconnection

Panel

and

internal

dividing

network

are

designed

sothatseparate

sets

speaker

cable

c¿nbe

attached

thewoofer(LF)

and

midrangd

treble(HF)portions

ofthedividing

networlcThis

confìguration

alledbi-wirîng.

Bi-wiring

can

provideseveral

sonic

advantages

and

considerably

moreflexibility

inpoweramplifier

selection.

Reduction of intermodulation

Themajority

ofcurrent

flowing

between

anamplifierand

speaker

devoted

to thereproduction

bass.

fnfrLæ"60%

or moreof an

amp's

powerisdestined

for the

woofers.

When current

flows

through

awire,

it produces

magnetic

fìeld

(EMF)which

expands

and

collapses

atarate

Drawing

L-A

- L7

position

topview

equalto thatofthe music's

complexfrequency

components.

asinglespeakerwiremustcon-

ductthefullmusicalfrequency

spectrum,thispreponderance

lowfrequencyinformation

can

interactwith or modulotehþh

frequencies.Theresulting

intermodulotioncan

createaudible

changesto trebleevenbeforeit

reachesyourloudspeakers.

usingseparateconductors

for highandlowfrequencies

(drawingL-C),

unwantedtreble

modulationisavoided.Bass

flowsthrough

one,

treble

throughanothen

Frequency-optimized cables

Havingtheopportunityto use

separateHFand

LFcables,

allows

you

to employconductorsbest

suitedto eachfrequencyrange.As

previouslynoted,mostamplifìer

powerísdestinedfor yourL7's

woofers,

souponfirstconsider-

ation,¡twouldmakesenseto use

veq/

thickwirefor LF

connections

and

tjrinner

wire

for HF

connections.

Howeve[thevery

fact

that

trebleishþherinfrequency,means

it isactuallymoresensitiveto the

typeand

gauge

ofwire used. Hþh

frequencies

are

prone

attenuation

fromaphenomenon

calledskr:neffedt.

Highquality

speakerinterconnectwires

minimizeskin

effectby

employing

largenumber

ofthinconductors

withverylowoxygencontent2.

Optimall¡you

should

useaudio-

phileinterconnects

for bothHF

and

LFconductors.

Howevenif

ydirrbudget

intervenes,

usethe

best

quality

speaker

cables

for the

highfrequency

connectionsand

planto addbetterbass

cableslaæn

Amplifier flexibility

Bi-wiring

alsoallows

you

the

optionof using

separutestereo

poweramplifiers

for leftandrþht

L7loudspeakers

or even

four

monopoweramplifiers.

Using

two stereoamplifiers

(drawingL-D)cannotonlyadd

sonic

improvementsbutupgrade

convenience

aswell.From

asound

standpoing

dualamplifiersreduce

intermodulation

between

leftand

rightchannels,

since

acompleteset

ofinputand

power

supplycircuits

aredevoted

to eachspeaker.Dual

amps

also

provideane:Ny

power

upgrade

path:

youcanstartout

lEeoors acaallyflo,,ralorgfie orærmostatorm

ofawire,nthertJænirside.Thenrcres.¡rácealeâ,

dælessresbance

to o-rrrern Tlns ürenumbercf

indvidul conducors(conmbutírgin<reased

skin

area)bmore imporarn únn thejrindividt¿l

drUgtess

2O"¡6en isacommonimgrrÇ incopperwire.

The,lesso46ør, thebeaercon&ctivity. Zp cordb

cornpoea ofaecoot¡ic ouó ¡itó copper

(El?C)

andtasslffinrcre o46en contentúnn dre

o4rgeftft€ehi$ corìductlvÇcopper

(OF{Q used

h çecftilgeakerwire

Dra¡ving

L-F

- Four-AmpBi-Wire

DrawingL-C- One-Amp Bi-Wire

DrawingL-D -Two-Amp Bi-Wire

Stereotube amp

DrawingL-E

- Three-AmpBi-Wire

w¡thonestereoamplifìer;

thenadd

asecondoneldterto quadruple

POWer

reseryes.

Three

or fourindividual

ampli-

fìersprovide

evñro¡u

possibilitíes,sinceyou

càn't¡3d¿¡f-

ferent

brandsandtypes.ofamps

for HFand

LFpower.

Many

seri-

ouslisteners

prefer

themidrange

andtreblesoundquality

produced

bytubeamplifiers.Howeve¡

many

tubedesignsdonotprovide

"tþht" abasssoundassolid

state

models

andoften

produce

less

power3.

Bi-wiringwith separate

bassandtrebleamplifìers

allows

useof bothtubeandsolid

statede-

signs,whereeachismost

desirable.

Whetheryouareusing

two or

fouramplifiers,it isimportant

usethesamebrand

and

power

ratingto powerlike

connections

onthe L7's.

lnfacL

sincethecross-

overpointfor the L7'sHF/LF

connectionsisl50H¿using

ampli-

fìersofthe samepowerfor both

wooferand

midbass/midrange/

trebleconnectionsisrecom-

mended.Forexample,

ina

2-amplifier

bi-wirehook-up,ifyou

areusing

a200-wattBrand

X amp

fortheleftLT,useamatching

200-

watt Br¿ndX ampfor therþht L7.

Or ifyou'r:epowering

theleftL7

lowfrequencyconnection

witha

1SO-wattBrandYampand

thehigh

frequencieswith a 1S0-wattBrand

Ztube amplifier;

usethesame

typesand

brandsofamplifiers

for

respective

rþht speakerHF

andLF

connections.

Bi-wiring connections

Drawings

L-GandL-Hshow

two bi-amplifìcation

options:dual

stereoamplÍfìer

andfour-amplifier

modes.

IMPORÏANT

l. The€xt€rnal

"strapping

bars"

which

normallyconnect

the

L7s'

HFandLFterminals

MUST

BEREMOVED

asshownin

Drawing

LJ (onthe nextpage)

BEFORE

BI-WIRING

CONNECTIONSARE

MADE.

2. NEVER

CONNECTTWO

AMPLIFIER

CHANNELSTO

THESAMELOUDSPEAKER

WITHOUT FIRST

REMOVING

THESTRAPPING

BARS.

Operating

two amplifier

channels

with the L7strapping

barsinplace

can

seriously

damage

the amplifìers!

3. lfyourpreamplifier

has

just

one

setof stereooutputs,youwill

tns c not to oy ú,"ttfrey cant Therearesome

*perb ulbeamplifiers

whió prwirle wery bitas

mudr tþtnr-*as solidslãtedes¡gns

Howwer,

úey arehighpower modebandarevery,VERY

epersive Moderåt€ly"ricedobe porver

amplifurs

tendto benndenæly powered

aswdL Theymidn

beaccepableforpowerír6de mldbesfmËrarrgd

reble poni<rn

of tÍ-wired L7s,hft\ rc'rildnor, in

o.¡roFinitxrbeúæbestdrcicefor lo¡¿bass

reproduaÍcninabi-wiredsFternwhidt willb€

$þ ærealt*ícconcerttnll leveh

DrawingL-G-Two Amp Bi-Wire Detail

Hook-upisidenticalfor

bothL7

speakers

Drawing

L-H- Four-AmpHook-Up Detail

need

to use

"Y' cordsinthe

three-amp

and

four-ampbLwire

hook-ups.

"Y'cordsare

available

from manysources

i¡cluding

your

JBL

dealer.

lfi,oú

häve

hookedupyour L7's

in.any

ofthebi-wireconfìgura-

tioÀs

indicated,it isnot

advisable

to useadditional

speakers,

eitherseparately

simultaneously.

Aswith conventional

one-

amplifier

connectionsshown

tlremain

LSeriesmanual,make

sure

thatallspeakercablesare

thesame

length.

Bi-amplification

Another adrancedoperation

alternative

is bktmplifuaion.

Instead

of beingdivided

byaninter-

nalcrossovecthefullfrequency

spectrum

isfikeredinto two

segments

bya2-wayocternal

elecuonic

crossoYen

whichiscon-

nectedbetween

the preamplifier

and

poweramplifiers.

Inbi-amplified

mode,the

LZs

woofer andmidrangdhigh-

frequency

transducersare

connected

direrlly

@separate

amplifiers.

Onlyaportion of the LZsinter-

naldividingnetworkisused.

The

wooferandmid-bæstransducer

section

ofthe crossoverareby-

passedviaaspecial

modification

which

canbe

performed

your

JBL

dealer.

Do notattemptto b¡-

amplifr

yourL7'swithouthaving

yourJBLdealerdotheproper

modification.

A suÍtable

elect¡onic

cnossover

rdt¡stbe

used.

Whilewe

dontdiscourage

bi-amplification,we

hastento note

ttrgtdre

LZsinærnd

crossover

difficukto

imprcve

on.ls phase

coherence,

freedom

fr'omdistor-

tionand

effciency

rinlevendte

finest

(and

most

o<pensive)

electroniccrctssoveß.

,_J

DrawingL-l

Rearof L 7 speakerwith

stapping

barc

disconnected

JBL

Consumer

Products,

lnc.

240Crossways

F¿rkWest,

WoodburyNY

¡1797

8500

BalboaBoulevard,

Northridge,

California

91329

(sr6)4e6-3400

H RHarman

InternationalCompany

PartNumber:739IG-L7A

Prinæd

inU.S,A"

ô6

Gó.,;r'

IO@"

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