LX 2003 (serv.man2) - JBL Audio User Guide / Operation Manual

lx 2003 (serv.man2) user guide / operation manual
Model
LX 2003 (serv.man2)
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26
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283.91 KB
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PDF
Document
User Guide / Operation Manual
Brand
Device
Audio
File
lx-2003-sm2.pdf
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Read JBL LX 2003 (serv.man2) User Guide / Operation Manual online

INSTRUCTION MANUAL · BETRIEBSANLEITUNG
MANUEL D’INSTRUCTIONS · MANUAL DE INSTRUCCIONES
HANDLEIDING · MANUAL D’USO · BRUKSANVISNING
KÄYTTÖOPAS
LX 2000 SERIES LOUDSPEAKER SYSTEMS
LX
ENGLISH
JBL LX SERIES INSTRUCTION MANUAL
Congratulations on choosing JBL LX Series loudspeakers.
JBL LX series loudspeakers are designed using the technologies that have made JBL the
world’s most famous brand of loudspeakers. 
Wherever loudspeakers are important, integral parts of musical performances - in opera
houses, in football stadiums or at rock concerts - JBL is the loudspeaker brand of choice.
By using only the best available materials and devoting careful attention to details, JBL is
certain that your JBL speakers will provide many years of excellent performance. 
The instructions in this manual will help you realize the full potential of your loudspeakers.
PLACEMENT
JBL LX Series loudspeakers are designed to produce the best possible sound when located
at some distance from walls and corners. Approximately 1 m is preferable. Placement in
corners or close to walls will increase the amount of bass, but not necessarily the quality of
the bass. If such placement is unavoidable it is recommended that you use the tone con-
trols on your amplifier or receiver to reduce the bass. 
The bookshelf-size loudspeakers should not be placed on the floor, but will greatly benefit
from placement on an open, rigid stand 35-50 cm high, which will place the high fre-
quency unit at ear level, which is important for the creation of the best possible stereo
image. Placement of the speaker on a high quality stand will improve the accuracy of the
bass, which again will lead to the most dynamic, expressive reproduction. 
We strongly advise that you consult your JBL dealer for advice and demonstration.
Should you want to mount your JBL LX speaker on the wall, it is recommended to use a
strong bracket. A distance of 2-4 cm from the wall will allow the rear panel mounted reflex
port to work, while complete closing of the port will reduce the deepest bass.
For the best stereo image the two loudspeakers in the stereo system should be placed at
the same distance from your listening position, and separated by an angle of 40° to 60°
(see illustration). For example, if your listening position is 2.4-3.6 m from each speaker,
the two speakers should be 2-2.4 m apart. 
Since every room is different, and since room acoustics are very important to the overall
sound, we strongly recommend that you experiment to find the placement that gives you
the most pleasing results.
INSTALLATION OF SPIKES (LX2003, 2004 and 2005)
Spikes isolate the speaker from floor vibrations. To install the spikes, follow these 
directions:
1. Turn the speaker upside down with the
bottom of the enclosure facing upwards.
2. Thread a nut onto each spike until the
nut reaches the unthreaded section.
3. Screw the spikes into the threaded
mounting sockets.
4. Adjust the spikes so they all are at the
same height, then tighten the nuts to
prevent the spikes from changing
height, or from rocking side to side.
THREADED
MOUNTED
SOCKET
NUT
SPIKE
BOTTOM OF ENCLOSURE
NUT
LOCKED
INTO
PLACE
ENGLISH
CONNECTIONS
NOTE: LX2004 and LX2005 have dual pairs
of gold-plated terminals. For normal connec-
tion with a single run of loudspeaker cable,
the metal bars between the High and Low
inputs MUST be in place. Connect cable only
to the inputs marked High. For separate
cable connections to the Low and High
inputs, see next section BI-WIRING.
Connect the loudspeakers to your amplifier or
receiver using two-conductor insulated wire.
We recommend 1.5mm
2
wire as a minimum
size for cable runs of up to 5 m. If your loud-
speakers have to be placed at greater dis-
tance from your amplifier or receiver you
should use heavier wire. Too thin wire or too
long wire runs can result in the sound from
the loudspeaker being different than intended, but will not do any harm. We recommend
that you consult your dealer, who will be happy to assist you in this matter. 
For each channel, the red terminal on the loudspeaker should be connected to the red (+)
loudspeaker terminal on the amplifier or receiver, and the black terminal on the loud-
speaker to the black (–) loudspeaker terminal on the amplifier or receiver. Connecting the
loudspeakers in this manner ensures that they will have the same polarity (“in phase”).
Connecting the loudspeakers with different polarity will not damage them, but will result in
less bass and a poor stereo image. This can be determined by listening to a solo voice: if
the voice can be located in the space between the two loudspeakers, the speakers are
connected with the same polarity. If not, the voice will sound diffuse and be difficult to
place in the space.
Most two-conductor wire is color-coded or has a ridge on one of its insulating jackets, so
that you can easily identify which wire is connected to which terminal. 
When connecting more than one pair of loudspeakers to an amplifier or receiver consult
your dealer or amplifier manufacturer to ensure that the resulting load can be handled
safely. 
BI-WIRING
LX2004 and LX2005 have dual pairs of gold-plated terminals and can be bi-wired. Before
bi-wiring, ALWAYS remove the metal bars between the High and Low inputs. Bi-wiring will
improve resolution and dynamics. For even greater improvement, you may use two ampli-
fiers (bi-amping).
40
°
-60
°
Listening
position
ENGLISH
DANGER: LOW POWER
Generally, loudspeakers can withstand a great deal of power, as long as the signal is undis-
torted. You can safely use a power amplifier with a power rating greater than the loud-
speaker’s recommended power, as long as the amplifier is not driven beyond it limits.
When amplifiers are overdriven, they “clip” the signal, creating distortion which appears as
a high frequency signal. These high frequency signals are directed to the high frequency
transducer by the crossover network, thereby creating a dangerous condition for the small-
est driver in the loudspeaker system.
The smaller the amplifier you use, the greater the danger of overdriving the amp, and con-
sequently the greater the potential danger to the high frequency transducer. 
Excessive boost of the tone controls of the amplifier or receiver can also aggravate the situ-
ation. 
Always use an amplifier or receiver that will make your LX loudspeakers play reasonably
loud and at the same time sound clean and undistorted.
LX2000 CENTER CHANNEL
For surround sound systems, the JBL LX Series includes a dedicated center channel loud-
speaker. LX2000 Center is magnetically shielded for safe use near the picture tube and
should be placed directly on top of or beneath the television set. The front edge of LX2000
Center should be on a line with the front edge of the television. LX2000 Center must be
connected in phase to the amplifier/receiver, i.e. plus-to-plus and minus-to-minus, exactly
like the left and right front loudspeakers.
GENERAL CARE
JBL LX Series loudspeaker systems are constructed of high quality MDF-board, superior to
solid wood in its acoustic properties. They are built to give many years of trouble-free ser-
vice, and do not require special attention. 
Occasional dusting with a clean, soft cloth will maintain the original beauty of the finish.
Furniture waxes, polishes or cleaners are not recommended. 
The grille may be gently vacuumed, and stains can be removed with an aerosol cleaner,
following the manufacturer’s instructions. Never use any solvents to clean any part of the
system.
SERVICE
Should your JBL LX Series loudspeaker ever need service, return it to the JBL dealer from
whom it was purchased. If for some reason this is impractical, contact your local JBL dis-
tributor.
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