JBL Decade L36 Bedienungsanleitung

L36 DECADE INSTRUCTION MANUAL

Excellence

isanelusivequality.It'ssoeasyto

recognizeyetsodifficulttoattain.

JBL

craftsmenhavebeeninvolvedintheartofsound

for

thana generation

—

signal

andsource,wood

and

fabric,transducersandacoustics

—all

ofit.

Today

these

craftsmencontinuetoperformtothe

most

rigid

standardsanycraftsmencansubmitto:

those

theyimposeuponthemselves.

JBL

loudspeakersarecarefullyengineered

instruments,

painstakinglycraftedandassembledto

watchmakers'

standards.JBLenclosuresexpressthe

excitement

ofcreativedesign;theyareelegant,

solid

and

flawlessly

finished.

JBLtransducersandelectronics

offerwhathasbeencharacterizedbydevotedmusic

listeners

asthe"incomparableJBLsound."

followingthefewsimplesuggestionscontainedin

this

booklet,youcanlookforwardtosuperbhigh

fidelity

reproduction

that

will

retainitsclarityand

realism

year

after

year.

JBLcontinually

engages

research

productimprovement.New

materials,

productionmethodsanddesignrefinements

are

introducedintoexisting

products

without

notice

asa

routineexpression

thatphilosophy.Forthisreason,

anycurrent

JBL

productmaydifferinsome

respect

from

itspublisheddescription

but

alwayswarranted

equal

exceed

theoriginaldesignspecificationsunless

otherwise

stated.

INDF.X

Concept

The

Decade

PerformanceCharacteristics 2

Specifications 2

ConnectingThe

L36

Listening

RoomAcoustics 5

Placement 5

Adjusting

TheSystem 6

Power

Capacity 8

SystemComponents 9

ComponentRemoval

The

Decade

Enclosure 13

Case

Trouble 14

Service 16

Summary

ForAdditionalInformation 16

Seriousaudiophilesalwaysinsistonequipment

representingtheverylatestdevelopmentsinthehigh

fidelity

arts.Andformostlisteners,theonly

acceptable

loudspeakershave

been

theworld'sfinest:JBL.

However,

thebuyerwhoenjoysmusicbutis

limited

toa

modestsumquiteoftenhas

been

settlingfor

less

—with

the

expectationthateventuallyhe

will

tradeuptoa JBL

system.

For

suchlisteners,therefore,JBLoffersthe

Decade

36,

ano-compromiseloudspeakersystemoptimizingour

latestdevelopmentsina moderatesizedenclosure.

The

Decade

achieves

full,

richperformance

utilizing

a 10-inchlowfrequencyloudspeaker,5-inch

midrange

transducerand1.4-inchhighfrequencydirect

radiator.

EachcomponentoftheL36has

been

designed

functionaspartofthecompletesystem,optimizing

performanceandefficiency

without

sacrificing

definition

ortheabilitytoaccuratelyreproducethe

fleeting

burstsofsonicenergy,

known

astransients,so

essentialtorealism.LikeallJBLloudspeakersystems,

the

L36utilizesa portedenclosureto

increase

efficiency

and

dynamicrange—incontrasttothe

sealed

"acoustic

suspension"enclosurewhich

achieves

apparent

bass

CONCEPÌ'OF

THEDECADE

response

the

expense

ofefficiency,dynamicrangeand

transient

reproduction.Efficiency

importantfortwo

reasons:itpermitsuseof

relativelylowpower,

moderately

pricedamplifier,anditallowstheamplifier

operate

ata

lowerdistortionlevel,providingthe

reservepower

necessary

toachieve

full

dynamicrange

and

excellenttransientreproduction.

The

Decade

exhibitsthestrong

bass,

well

defined

midrange

andsparklinghighfrequencyreproduction

characteristicofallJBLloudspeakersystems.However,

the

most

striking

characteristicofthesystem

its

exceptionalclarity.Modernrecordingscontainauditory

effects

thatcanonly

capturedthroughthetechnology

•of

electronicsappliedin

recordingstudioor

ata

live

performance—delicateovertonescapturedby

microphone

placementandcomplexharmonics

producedbyelectronicsynthesis.Suchstateoftheart

techniques,usedinbothcontemporaryand

classical

recording,

place

rigorousdemandsoneventhemost

sophisticatedloudspeakersystems— demandsthatJBL

hasalwaysmetandsurpassed.

numberofloudspeakersystemscanhandlelarge

amounts

ofpower;othersarehighlyefficient.JBL

productsareuniqueintheirabilitytocombineboth

attributes.

TheL36,forexample,

will

convert

1-Watt

input

"white

noise"1

into

soundpressurelevel

dBmeasured

ata

distanceof15feet.2This

approximately

twice

loud

ordinaryconversation

and

represents

comfortablelisteninglevel,

demonstrating

thattheL36deliverssubstantialsound

output

from

very

little

inputpower.

Ratherthanrepeattheambiguityofmosttechnical

specifications,JBLhas

traditionally

refrained

from

listing

dataforwhichnowidely

accepted

testprocedure

hasbeenestablished.Inthe

absence

ofsuchstandards,

any

well

equippedlaboratorycanlegitimatelyproduce

variety

offrequencyresponsecurvesfor

loudspeaker,

"White noise" is a rigorous test simulating

average

musical

program material under laboratory conditions. It provides a

controlled

means

of energizing all the transducers of a

loudspeaker system simultaneously. "White noise"

encompasses all audible frequencies

just

as white light

includes

all the colors of the visible spectrum. Produced in

the laboratory by a signal generator, "white noise" sounds

very

much like the hiss

heard

between FM radio stations.

decibel

(dB), in this context, is a

unit

expressing relative

loudness of sound. Three dB is approximately

equal

to the

smallest

change

in loudness of program material ordinarily

detectable

by the human ear.

PERFORMANCE

CHARACTERISTICS

SPECIFICATIONS

dependingontheconditionsselected.AtJBLthe

final

analysesarecomprised

extensivelisteningsessions.

Although

laboratorydataare

integralpart

the

process,

thetrainedear

theultimatecriterion.The

success

thisphilosophy

reflectedintheenthusiastic

acceptance

JBLsystems

recordingstudio

engineers,producersandperformers—professionals

whoseartisticachievementsarecloselyrelated

the

equipmenttheyuse.

Power

Capacity1

Wattscontinuousprogram

Nominal

Impedance 8ohms

Dispersion

90°

horizontalandvertical

CrossoverFrequencies 1500and

6000

Efficiency

Watt

input

produces

76dB

SoundPressureLevel

ata

distance

15'

(Note:

75-80

dB is a

comfortable

listening

level.)

Low

FrequencyLoudspeaker

Nominal

Diameter 10inches

25cm

Voice

Coil

2-inch

cm)copper

MagneticAssemblyWeight 2Vi pounds1.1

Flux

Density

8500

gauss

Sensitivity2

Midrange

Transducer

Nominal

Diameter 5inches

13cm

Voice

Coil

%-inch

(2.2cm)copper

MagneticAssemblyWeight l5/8pounds0.7kg

Flux

Density

15,000

gauss

Sensitivity

Averaged1-3

kHz. 45

High

FrequencyDirectRadiator

Nominal

Diameter 1.4inches

3.6cm

Voice

Coil

5/8-inch(1.6cm)copper

MagneticAssemblyWeight

pounds0.7kg

Flux

Density

15,000

gauss

Sensitivity

Averagedabove

2 kHz.

Finish

Natural

Oak

Grille

Stretchfabric

Grille

ColorOptions Orange,Blue

Brown

Dimensions 131/2"x24"xl35/8"deep

34x61x35

deep

Shipping

Weight 45lbs

Basedona laboratory

test

signal.SeePowerCapacitysectionforamplifierpower

recommendation.

2.Sincethemajorportionoftheenergyreproducedbythelowfrequency

loudspeakerliesbelow800Hz,thisspecificationhasbeendevelopedusinga

test

signal

warbledfrom100to500Hz,

rather

thanthe1-kHzsinewave

test

signalon

which

theconventionalEIAsensitivityisbased.

IMPORTANT:

Whenconnectingordisconnecting

loudspeakers

from

anamplifier,theamplifiermust

turned

off.

Making

connections

while

theamplifier

operating

couldseriouslydamagetheloudspeaker

system

and

void

the

warranty.

Eighteen-gaugeinsulated

wire

(ordinaryhousehold

lampcord)

the

minimum

sizerecommendedfor

loudspeakerconnectionsupto

feet.Beyondthis

distance,heaviergaugeinsulated

wire

recommended;

16-gauge

from

to100feetand

14-gauge

from

100to200

feet.Iflampcord

used,wirescan

differentiatedby

noting

thatoneoftheinsulatingjackets

smooth,

while

the

otherhas

distinctridge.Byconsideringtheridged

jacket"red"andthesmoothjacket"black,"

wiring

connectionscan

made

ifusingcolor-coded

wire.

Connectionstotheaudiopowersourcearemade

using

thetwopushbutton

terminal

postslocatedonthe

back

oftheloudspeakersystemenclosure.Theholesin

JBL

terminal

postsdonot

allow

theconnecting

wire

pass

allthewaythrough,preventingthepossibilityof

short

totheother

terminal

postortonearbyelectrical

conductors.

make

secure

connection,stripapproximately

inch

ofthe

insulation

from

theendofthe

wire,

push

down

thespring-loaded

terminal

postcap,insertthe

bare

wire

into

theexposedopeningofthe

terminal

post

and

release.(Insertionofthe

wire

into

theopening

will

beeasierifthestripped

wire

first

tinned

with

soldering

tool

andsolder.)

Locatetheloudspeakeroutputterminalsonthe

back

thereceiverorpoweramplifier.For

each

loudspeaker

system,

connectthe

wire

from

theblack

terminal

postto

the

amplifieroutput

terminal

labeled"common,"

"ground"

or(—),andthe

wire

from

thered

terminal

post

theremaining8-ohmspeakeroutput?

Note

thatmanyamplifiershave

chassis

grounding

terminal

which

usuallyisolated

from

theother

connectors.Thisshouldnot

confused

with

the

"ground"

designationsometimesusedtodescribetwo

theterminalsin

each

setofloudspeakerconnections.

Connecting both speakers as described

will

insure

proper

"in

phase" operation; i.e., their cones

will

respond to a

monophonic signal by moving simultaneously in the

same

direction,

and not opposite to

each

other. Inadvertent

out-of-

phase operation

(which

occurs when one set of speaker

wires

is reversed

with

respect to the other)

will

not harm the

system,

but may cause

some

acoustical "cancellation" which

will

have the audible effect of reducing low frequency

response.

CONNECTING

THEL36

The

specified8-ohmimpedancerating

isa

nominal

figure

which

suggests

connectiongivingthemost

efficient

powertransferbetweenamplifierand

loudspeakersystem.However,

or16-ohmamplifier

terminals

can

used

without

danger.

The

soundreflectingorsoundabsorbingqualities

the

listeningroom

will

affectthesoundqualityof

loudspeakersystem.Room

acoustics

can

testedby

listening

tothe

echo

sharpsound,such

hand

clapping.

roomhavinglargewindows,paneledwallsand

hardwood

floororceiling

will

acoustically

"live"

and

will

echo

noticeably.

roomcontainingoverstuffed

furniture,

carpetedfloorsordrapedwindows

will

acoustically"dead"and

will

echo

very

little

ornot

all.

Ideally,

thereshould

bea

reasonable

balance

between

absorptivematerialandsoundreflectingsurfaces.

therearetwolargereflecting

surfaces

facing

each

other,

the

"bounce"betweenthem

will

makesoundsrun

togetherandthemusic

will

lack

definition.

Large,

flat

wall

surfaces

should

brokenup

with

bookshelves,

drapesor

screens.

Although

JBLloudspeakershave

widesound

dispersion

pattern,the

final

soundofthecompleted

installation

affectedbythelocationoftheenclosure

within

thelisteningenvironment.Ifpossible,experiment

with

placementof

each

loudspeakersystembefore

decidingon

final

arrangement.

For

the

best

possiblestereoperformance,thetwo

loudspeakersystemsshould

arrangedsymmetrically

each

sideofthelistener.As

general

rule,

person

sitting

intheusuallisteningpositionshouldseeanangle

LISTENING

ROOM

ACOUSTICS

PLACEMENT

Depress colored button, exposing

hole

in terminal post.

Push

stripped end of

lead

wire into

hole

and

release

button.

Never apply

twisting

force to the terminal post.

about

40°

betweenthetwosoundsources.The

distance

from

oneloudspeakerenclosuretotheother

determined

bytheirdistance

from

thelistenerandby

the

40°

"listeningangle."

Loudspeakersmaybepositioned

anyheightabove

the

floor,althoughlocatingthehighfrequencydirect

radiator

nearearlevelusuallygivesthemostrealistic

suggestionof

live

performance.

Bass

response

will

beaugmentediftheenclosuresareplacednearadjacent

room

surfaces,such

corneroron

wall

nearthe

floor

orceiling.

The

L36

provided

with

Presence

controlto

regulatetherelativeloudnessofthemidrange

transducerand

Brilliancecontroltoadjustthevolume

levelofthehighfrequencydirectradiator.These

controls

adjusttheoutputofthecomponent

loudspeakerstoachieverealistictonal

balance

variety

ofroomconditions.

The

controlsarecalibratedintermsof

referencelevel,

indicated

"0"ontheinstructionplate.Whenboth

the

Presence

andBrilliancecontrolsaresetatthislevel,

the

loudspeakersystem

will

adjustedforbalanced

LOUD-

SPEAKER

LOUD-

SPEAKER

ADJUSTING

THESYSTEM

40°

"Listening

Angle"

Sound

energy from

each

loudspeaker blends to form a

stereo "wall of sound." The stereo image

will

be intensified

and the

area

of best stereo perception increased if the two

systems

are rotated

slightly

toward the preferred

listening

position.

performancecharacteristicsin

reverberation-free

environment.

Sincemostlisteningrooms

possess

varying

degrees

ofreverberation,someadjustment

thecontrols

usuallypreferred.

Theloudspeakersystemshould

adjustedwhile

reproducingnormalprogrammaterial

with

the

amplifier

tonecontrolsset

themiddle(generally

referredto

"flat")position.Beginbyplacingboth

theloudspeakersystemcontrols

thereferencelevel

andlisteningto

varietyofprogrammateriallong

enoughto

become

accustomedtothesystem's

performance.

After

theearhas

become

attunedtothe"0"setting,

evaluatethe

presence

andbrilliancequalitiesofthe

loudspeaker'sperformance.Themostvalidevaluation

will

obtainedusingvarioustypesofmaterialplayed

monaurally.

(Thiscan

accomplishedinstereo

quadraphonicinstallationsbysettingtheamplifiermode

control

formonauralreproductionandusingthebalance

control

select

theindividualloudspeakersystemto

adjusted.)Theevaluationshould

madewhileseated

thenormallisteningposition.

arrive

thespecificsettingfor

each

ofthe

loudspeakersystemcontrols,proceed

follows:

Setthe

Presence

control

at"0"

androtatethe

Brilliance

controltotheextremeleftofitstravel.This

will

attenuatehighfrequencyperformance

thatthe

ear

will

perceiveonlythebalancebetweenthelow

frequencyloudspeakerandthemidrangetransducer.

2.Ifmidrangematerial—such

violin,

piano,

guitar

—seems

too

oroveremphasized,reducethe

setting

ofthe

Presence

controlbyrotatingittotheleft.

Conversely,ifmidrangematerial

seems

toodistant,

increasetheoutputofthemidrangetransducerby

rotating

thecontrolclockwise.

Presence and Brilliance controls are conveniently

located

on the front of the enclosure,

behind

the

removable

grille

assembly.

3.Oncethe

Presence

controlhasbeenadjustedto

provide

themostpleasingbalancebetweenthelow

frequencyandmidrangetransducers,settheBrilliance

control

at"0."

Ifhighfrequencymaterial—such

cymbals,bells,triangles,

violin

overtonesorvocal

sibilants

—seemtooprominent,lowerthesettingof

the

Brilliancecontrol.Ifgreaterhighfrequencyoutput

desired,increasethesettingofthecontrol.

After

each

setofadjustments,againlistento

variety

programmaterial

until

theearhas

become

attuned

thenewcharacteristicsandcancomparethemtothe

performanceofthesystem.Oncethe

Presence

and

Brilliancecontrolshavebeensetforthemost

pleasingoverallresults,andthe

exact

placementof

•each

loudspeakerhasbeendetermined,compensation

for

differencesin

individual

recordingsshould

made

with

thetonecontrolsontheamplifierorreceiver.

The

specifiedpowercapacityindicatesthecontinuous

program

powerlevelthatcan

accepted

JBL

loudspeakersystem

without

damage.Itspeakpower

capacityisconsiderablygreaterthanthecontinuous

rated

value,

indicatedbytheremarkabletransient

responseofJBLloudspeakersystemcomponents.The

Decade

will

reproducecleansoundatcomfortable

listening

levelswhendrivenbyanamplifierhavingan

output

ofas

little

10WattsRMSperchannel.4

However,

forreproductionofthe

full

dynamicrange

contemporaryrecordingsathighvolume,

quality

amplifier

deliveringupto100WattsRMSperchannel

will

provide

optimum

performance.Innormalhigh

fidelity

applicationsanamplifiershouldnever

operated

with

itsvolumecontrolatmaximum,yet

suchanamplifierhasthereservepower

necessary

for

accuratereproductionoftransients,whichcanreach

momentary

peaksequivalenttotentimestheaverage

power

level.

distortion

heard,oneormoreofthesoundsystem

components

operatingbeyonditscapacity(assuming

each

componentisproperlyadjusted)andtheoverall

volume

levelofthesoundsystemshould

reduced.

almostall

cases,

theacousticlevelgeneratedby

JBLloudspeaker

will

become

noticeablydiscomforting

theearbeforetheloudspeakercan

damagedby

excessive

power

from

theamplifier.There

virtually

The RMS (root

mean

square)

rating

of amplifier power

the most

stringent

method

currently

used in the audio

industry.

An amplifier rated at 60

Watts

RMS per channel,

for example, is generally considered to be a high-powered

unit.

The

same

output expressed in terms of

"Music

Power"

would

be 160

Watts.

PO\

vEkCAPACITY

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