JBL LXE330 Manuel utilisateur

LXE SERIES

OWNER’S

MANUAL

LXE

LXE330

LXE550

LXE770

LXE990

SERIES

LXE owners manual 7/27/98 4:34 PM Page 8

INTRODUCTION

Congratulations on choosing

JBL loudspeakers. Their highly

accurate, uncolored and balanced

sound character will greatly

increase your enjoyment of

recorded music. JBL speakers are

built with careful attention to detail,

using only the highest quality

materials. They will provide many

years of excellent performance.

The LXE Series rivals the

performance of loudspeakers

available at considerably higher

price points; and achieves

remarkable imaging, sound stage,

and musicality.

Acoustic Reflection

Cancellation (ARC): Provides

smooth, well-defined high

frequency response. Because the

LXE tweeter faceplate has no

concentric or parallel lines, it

produces high frequency signals

without diffraction.

Pure Titanium, Smooth Dome

Tweeter with Diamond

Surround: Provides low

resonance frequency, low

distortion, flat and smooth high

frequency response, and no

break-up in the audio range.

The result is a well-defined high

frequency output.

High Polymer Laminate

Midrange Drivers and Woofers:

Combine to provide tight bass and

well-defined, smooth midrange,

without harshness, stridency, or

listener fatigue.

High Quality Crossover

Network: The computer-optimized

dividing network employs up to

third-order (18 dB per octave)

crossover sections. JBL’s use of

high quality capacitors and low-

loss/low-distortion inductors

assures freedom from phase or

amplitude distortions.

Neoprene-covered Baffle-board:

Specially designed, acoustically

damping, and absorbent

Neoprene foam surface surrounds

the speaker’s drivers and absorbs

diffraction waves.

Acoustically Optimized Cabinet

and Grille Design: Provide

smooth uncolored sound and

eliminate diffraction and unwanted

resonances.

LXE owners manual 7/27/98 4:34 PM Page 1

Compact systems will also benefit

from placement on stands or

shelves. For the best stereo

imaging, we recommend that the

systems be placed so that the high

frequency transducers are as

close as possible to the ear level

of a seated listener. Every room is

different and there are different

tastes. So don’t hesitate to

experiment on your own.

POWER HANDLING

Thanks to their high efficiency,

the LXE Series loudspeakers will

produce reasonable volume levels

in a room of moderate size with

very little amplifier power.

However, using a small amplifier

to obtain the desired volume

listening levels may lead to

overdriving the amplifier. This will

generate high distortion levels and

may cause damage to your

loudspeaker. For the best

performance, an amplifier should

be selected with an output rating

that is greater than the maximum

power that will be used. This

margin of reserve power will

ensure that the amplifier will not

attempt to deliver more power

than its design allows. However,

the power amplifier’s power rating

per channel must not exceed

the maximum recommended

amplifier power for that specific

loudspeaker model. Please see

the specifications section for

details. Following these guidelines

will provide virtually distortion-free

sound reproduction and long

loudspeaker life.

PLACEMENT

For the best stereo reproduction,

the two loudspeaker systems

should be an equal distance from

your listening position and

separated so that the angle

between them, at the listening

position, is between 40 and 60

degrees (see Fig. 1). For example,

if your listening position is 8 to 12

feet (2.5 to 4 m) from each

speaker, the two systems should

be about 8 feet (2.5 m) apart.

Placing the loudspeakers in

corners or against a wall will result

in the strongest (not necessarily

the most accurate) bass. Since all

LXE models have ports on their

front baffles, the speakers may be

pushed up against a wall or

bookshelf surface.

40°-60°

Fig. 1

LXE owners manual 7/27/98 4:34 PM Page 2

a visual difference between

the two conductors of each

molded pair of speaker wire.

Differentiating marks can be a

different color wire (copper or

“silver”); a strand of yarn in one

conductor; thin, raised ribs on one

part of the outer insulation; or a

printed “+” marking on one of the

insulators. It does not make any

difference which of the two strands

of wire go to (+) and (–) on the

speakers and amplifier, as long as

all speakers used in your system

are connected identically. Push

down on the button below the

terminal and insert the wire, or the

banana plug, through the hole.

For each channel, the red terminal

on all loudspeakers should be

connected to the red or (+)

speaker connection terminal on

the receiver or amplifier, and the

black to the black or (–) (see Fig. 2).

Connecting the loudspeakers in

this manner ensures that they will

be in phase; that is, work together

rather than in opposition.

Connecting the loudspeakers out

of phase will not damage them,

but will result in less bass and

poor imaging.

CONNECTIONS

To connect the loudspeaker

systems to the receiver or

amplifier, use two-conductor

insulated wire. Your JBL dealer

can recommend suitable cables,

or you can buy wire at most

hardware or electronic stores.

High quality connectors and cable

offer consistent performance that

does not deteriorate over time. We

recommend #16 AWG wire as a

minimum size. If your speaker

is more than 30 feet (10 m) from

your receiver or amplifier, use

larger diameter lower gauge wire.

Connections are made at the

terminals located on the back of

the loudspeaker system. The

terminals accept bare wire or dual

banana plugs, either of which will

provide easy, secure connections.

Preparing The Hookup Wire

Carefully plan your wire lengths

before cutting any speaker wire.

Be sure to allow plenty of extra

wire to help hide paths in corners,

along baseboards, etc.

1. First determine the distance

between the most distant speaker

and the receiver or amplifier.

2. Now make the hookup wires for

both

speakers

this length

, even if

one LXE Series loudspeaker is

much closer to your amplifier than

the other. This will help maintain

proper signal balance.

3. Strip off 3/8" of insulation from

both ends of each conductor.

4. Twist each set of thin wires into

a tightly-bunched spiral.

5. At this point you need to identify

Left

Speaker

Amplifier/Receiver

Right

Speaker

Red Blk.

(+)

(–) Red

Blk.

(+) (–)

Fig. 2

LXE owners manual 7/27/98 4:34 PM Page 3

must consult the amplifier/receiver

manufacturer for clarification.

TROUBLESHOOTING

The vast majority of new speaker

“malfunctions” end up being traced

to connections or switch settings.

To avoid packing up correctly

functioning speakers and sending

them off, only to find that they’re

not really at fault, check the

following tips first, before

requesting service.

No sound at all or very faint sound

from either speaker

1. Amp/receiver tape monitor

button pushed in while using CD,

FM or phono inputs.

2. Wrong speaker switch, “A” or

“B” speaker output.

3. Sound source (CD, cassette

deck, turntable) not turned on, not

activated, not hooked up or not

selected on amp/receiver front

panel.

No sound from one speaker

1. Balance control turned all the

way left or right.

2. Speaker wire has become

disconnected.

3. One of the connections

between sound source and

amp/receiver is faulty or has

become disconnected.

Both speakers play at low volumes

but shut off as volume is increased

OR sound turns on and off

intermittently

A few strands of speaker wire may

be shorting out. Recheck the

connections. Recheck the

Hooking Up Multiple Sets of

Speakers

If your receiver has two complete

sets of speaker terminals (“A” and

“B”), it's possible to hook up an

additional pair of speakers for

simultaneous

sound in another

room. However, some speakers

may not be usable as a second

pair if you want to play two

sets at once. Before hooking up

another set of speakers besides

your LXE Series, check the

following:

1. Your amplifier or receiver

minimum load impedance.

Impedance is always expressed

in ohms and can be found in the

owner’s manual that came with

your unit. For example, the

following are typical entries in

amplifier/receiver owner’s

manuals:

A) 100 watts RMS into 8 ohms,

both channels driven, 20-20kHz

with less than 0.02% THD.

B) 160 watts RMS into 4 ohms,

both channels driven, 20-20kHz

with less than 0.02% THD.

2. The nominal impedance of

the second set of speakers.

A pair of LXE speakers when

conbined with another pair of

8 ohm speakers will present an

impedance to the amplifier/receiver

that is approximately 4 ohms. This

speaker combination can be used

with the amplifier/receiver cited in

B above. If the amplifier/receiver

has a specification similar to that

shown in A above, or if your

second set of speakers has an

impedance other than 8 ohms, you5

LXE owners manual 7/27/98 4:34 PM Page 4

minimum speaker impedance

required by the amp.

Bass is very weak AND/OR sound

seems to come from each speaker

separately, without creating a

stable stereo image between the

speakers.

1. The polarity (+ & –) of one

speaker has been reversed

relative to the other. Double

check connections.

2. Speakers are too far away from

back and side walls or too far

apart. Experiment again with the

speaker placement. If you are still

encountering problems, consult

your JBL dealer.

GENERAL CARE

The grille is held in place by pins

near the edges. To remove the

grille, grasp it by both top and

bottom edges and pull gently.

To replace grille, re-position it

carefully and press gently at the

corners. Do not push on the center

area of the grille.

The loudspeaker cabinet may be

cleaned with a slightly damp cloth.

To remove dust from the grille

cloth, use a vacuum with a brush

attachment. Spots may be

removed with a commercial spot

remover. Do not use any cleaners

or solvents on the speaker drivers

themselves.

SERVICE

Should your loudspeaker ever

need service, return it to the

JBL dealer from whom it was

purchased. If for some reason this

is impractical, in the United States,

call 800-336-4JBL for your nearest

warranty station. Military

personnel who purchased from

authorized military outlets should

return them to a similar outlet or

contact:

Mohawk Marketing Corp.

149 Business Park Drive

P.O. Box 62229

Virginia Beach, VA 23462

Phone: 804-499-8901

Fax: 804-497-6690

If purchased outside the United

States, contact your local

distributor to make arrangements

for repair service. Do not return

products to the JBL factory.

LXE owners manual 7/27/98 4:34 PM Page 5

Specifications LXE330 LXE550 LXE770 LXE990

High Frequency 1" Pure 1" Pure 1" Pure 1" Pure

Dome Transducer Titanium Titanium Titanium Titanium

Midrange Transducer n/a n/a 5" 5"

(High Polymer Laminate Cone)

Low Frequency Transducer 61/2" 8" 8" 10"

(High Polymer Laminate Cone)

Crossover Frequency 3.7 kHz 2.3 kHz 760/3.7 kHz 800/3.2 kHz

Frequency 55 Hz to 41 Hz to 41 Hz to 40 Hz to

Response (– 6 dB) 23 kHz 23 kHz 23 kHz 23 kHz

Sensitivity (1 Watt/1 meter) 90 dB 91 dB 91 dB 92 dB

Nominal Impedance 8 ohms 8 ohms 8 ohms 8 ohms

Recommended 10 to 125 10 to 140 10 to 150 10 to 200

Amplifier Power* Watts Watts Watts Watts

External Dimensions

Height 173/8"23

1/8" 26" 281/2"

Width 95/8"12

1/8"12

1/8"13

1/2"

Depth 63/4"8

15/16"8

15/16"

External Dimensions

Height 441 mm 587 mm 660 mm 724 mm

Width 245 mm 308 mm 308 mm 343 mm

Depth 172 mm 227 mm 227 mm 227 mm

Weight (each) 15 lbs 24 lbs 29 lbs 33 lbs

6.8 kg 10.9 kg 13.2 kg 15.0 kg

Shipping Weight 34 lbs 52 lbs 33 lbs 37 lbs

15.4 kg 23.6 kg 15.0 kg 16.8 kg

*The maximum recommended amplifier power rating will ensure proper system headroom to allow for

occasional program peaks. We do not recommend sustained operation at these maximum power Levels.

JBL continually strives to improve its products. New materials, production methods and design refinements

are introduced into existing models without notice as a routine expression of our design philosophy. For this

reason, JBL LXE Series Loudspeakers may differ in some respect from their published specifications

and descriptions, but will always equal or exceed the original specifications unless otherwise stated.

LXE owners manual 7/27/98 4:34 PM Page 6

80 Crossways Park West, Woodbury, NY 11797

8500 Balboa Blvd., Northridge, CA 91329

Part No. 308338-001

LXE owners manual 7/27/98 4:34 PM Page 7

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