DOWNLOAD JBL XTi 20 (serv.man2) Service Manual ↓ Size: 463.46 KB | Pages: 10 in PDF or view online for FREE

Model
XTi 20 (serv.man2)
Pages
10
Size
463.46 KB
Type
PDF
Document
User Manual / Operation Manual
Brand
Device
Audio
File
xti-20-sm2.pdf
Date

JBL XTi 20 (serv.man2) User Manual / Operation Manual ▷ View online

XTi Series
MANUAL
BETRIEBSANLEITUNG
MANUEL D'EMPLOI
MANUAL DE INSTRUCCIONES
GEBRUIKSHANDLEIDING
MANUALE DI ISTRUZIONI
BRUGSANVISNING
ENGLISH
INTRODUCTION
JBL craftsmen have been involved in the art of sound for
more than two generations – signal and source, wood
and fabric, transducers and acoustics – all of it.
JBL loudspeakers are carefully engineered instruments,
painstakingly crafted and assembled to watchmakers
standards. JBL transducers and electronics offer what has
been characterized by devoted music listeners as "the
incomparable JBL sound".
By following the few simple suggestions contained in this
booklet, you can look forward to superb high fidelity
reproduction that will retain its clarity and realism year
after year.
We strongly suggest that you keep the packing material
for future purposes, in case you are moving or your loud-
speakers should require service.
PLACEMENT
Your JBL XTi-Series speakers are able to give a very satisfy-
ing sound in a great variety of listening rooms when set
up in an even sided triangle with respect to the listener.
However, a careful setup procedure will always be
rewarding, and for best results we recommend placement
well away from the boundaries of the room with prefer-
ably minimum 0.75 m (30 in) distance to the wall behind
the speakers, and 0.75-1.0 m (30-40 in) distance to the
side walls.
Your authorized JBL dealer will be happy to help you
obtain the best possible performance from your JBL
speakers.
NOTE: New loudspeakers require a certain amount of
"exercise" before they perform their best. A steady level
of performance is achieved after 8-12 hours of operation,
depending on the nature of the music and the level. 
CONNECTIONS
IMPORTANT: When connecting or disconnecting loud-
speakers from an amplifier, the amplifier must be turned
off. Making connections while the amplifier is operating
could seriously damage the loudspeaker system and void
the warranty. The amplifier must also be turned off before
connecting or disconnecting cables, at the amplifier or
pre-amplifier inputs.
1 mm
2
(18 AWG) insulated wire is the minimum size rec-
ommended for loudspeaker connection up to 5 meters
(16 ft). Beyond this distance, heavier gauge wire is recom-
mended. 
Speaker wire and interconnect cables are important com-
ponents in an audio system. With all other factors at an
appropriate level of quality the speaker cable and the
interconnect cable can make significant contributions to
the perceived sound quality. Careful selection of cable
and interconnect can add or subtract marked shadings in
the tonal character. Likewise, different cables can have
quite a dramatic impact on the dynamic contrasts experi-
enced by listeners.
Your JBL dealer has the experience and knowledge to rec-
ommend suitable interconnects and speaker wire to best
complement your system.
Connections to the loudspeaker system are made at the
terminals located on the back of the enclosure. These ter-
minals permit a variety of connection methods.
The most straightforward connection is made by directly
connecting clean bare wire. This connection is made by
stripping 8-10 mm of insulation off the loudspeaker wire
and passing the bare wire through the hole in the binding
post. The knob can now be tightened securely, and any
excess wire that is not in contact with the binding post
surfaces should be trimmed to avoid short circuits.
A very convenient way of connection is the use of 4 mm
banana connectors, which are then, in turn, connected to
the binding posts. Bear in mind, however, that the num-
ber of contact points should be kept to a minimum, and
at the same time each contact should be as tight as 
possible.
For the same reason, we recommend the use of the high-
est quality spade connectors, expertly connected to the
selected cables. Spade lugs will make the best possible
connection between the speaker wire and the loudspeak-
er system, minimizing any contact resistance that might
degrade the sound ever so slightly.
It is essential that both loudspeakers in a stereo system
have the same polarity with respect to the input signal
(are in "phase"). JBL XTi-Series are designed to produce a
positive pulse when a positive signal is applied to the red
input terminal.
If the driver cones of the two loudspeakers do not move
in the same direction for a given voltage at the input ter-
minals, there will be a lack of stereo definition and a loss
of deep bass.
We recommend experimenting with the polarity of the
speakers, since recordings, program sources or power
amplifiers can invert the polarity of the signal. The "cor-
rect" connection is the one that yields the best audible
results. Be sure to reverse both left and right connections
to keep the systems in polarity.
ENGLISH
BIWIRING
JBL XTI-Series loudspeakers may be connected to the
amplifier using two lengths of wire for each speaker. The
"biwire" connection method offers several options and
advantages.
The system's internal dividing networks are electrically
separated at the low frequency to midrange/tweeter tran-
sition. External strapping bars connect the two parts of
the network when a single wire connection is used. The
system is shipped from the factory with the strapping bars
in place. By removing the bars, connections may be made
to the individual network sections using two wires (four
conductors) as shown in Figure 1. The wires used may be
of the same type for both low frequency and high 
frequency sections. The advantages are that wire effect
(resistance, inductance, etc.) are reduced and inter-
modulation of low and high frequencies in the cable are
avoided. 
CAUTION: Never connect two amplifiers to the same
loudspeaker without first removing the strapping bars.
Operating two amplifier channels with the bars in place
may seriously damage the amplifiers and void the war-
ranty.
AMPLIFIER POWER
RECOMMENDATIONS
The JBL XTi-Series speakers are capable of handling peak
power far exceeding the continuous rating specified for
the individual speakers.
The continuous ratings are based on an eight hour test
using broadband noise shaped to simulate the power dis-
tribution of music. The peak rating of approximately 4
times the continuous rating indicates the system's ability
to handle transient peaks well above the average power
levels.
Amplifier power ratings are an INDICATION of how loud
the system will play without distortion. Amplifier power is
generally measured with steady state test signals and per-
haps, in addition, dynamic measurements into resistive
loads. Unfortunately none of these are firm indications of
how loud the system will sound in a given listening room.
For these reasons, an amplifier should only be chosen
after careful listening. If it is possible to achieve the
desired volume level without distortion, then the amplifier
has sufficient power regardless of the rating.
Fuses or circuit breakers of any kind should not be used
between the amplifier and loudspeakers. All such devices
will seriously degrade the sound quality and do not
ensure protection from loudspeaker damage. The key to
safe operation is adequate amplifier power to avoid dis-
tortion at the highest sound levels required.
SPIKES
The JBL XTi-speaker can be fitted with "spikes" for the
best possible mechanical contact to the floor. In each cor-
ner of the bottom of the speaker is a threaded insert that
allow insertion of the spikes supplied with each speaker.
When mounting the spikes please make sure that each
spike has good contact to the floor beneath the speaker
before tightening the nuts on each spike. 
GENERAL CARE
JBL XTi-Series loudspeaker systems are finished in materi-
als that will retain its finish for many years to come.
Occasional cleaning with a clean, soft cloth will maintain
the original beauty of the finish. Only lint-free cotton
cloths should be used for dusting. To remove fingerprints
and smudges, an ammonia-free window cleaner may be
used. Apply a small amount to a lint-free cotton cloth and
gently clean the surface. Never use any abrasive cleaners
or strong chemical to clean the enclosure. In case of deep
Fig. 1: XTi input
Low Frequency
High Frequency
Amplifier
-
+
+
+
-
-
ENGLISH
scratches or damage, please consult a qualified furniture
repair shop.
GRILLE
The grille is held in place by a pin located at each corner.
To remove the grille, grasp two corners and gently pull
the grille away from the enclosure. To replace the grille,
position the mounting pins on the cups and gently press
until the grille meets the enclosure. Although the grille
has been engineered to minimize acoustical interference,
high frequency response and stereo imaging will be
improved by removing the grille.
Any dust on the grille should be removed using a cleaning
brush or a vacuum cleaner.
SERVICE
JBL loudspeakers are designed to give years of trouble-
free service. No periodic maintenance is required. If a
problem is suspected, first make sure all connections are
properly made. If a problem exists in one loudspeaker,
reverse the speaker wires to the left and right system. If
the problem remains in the same system, then the fault is
in the loudspeaker. If the problem appears in the opposite
system, the cause is in another component or cable.
Do not return products to the JBL factory without prior
authorization. 
Address correspondence to: 
JBL Customer Service, 2, route du Tours, 
72500 Château-du-Loir, France, 
or your local JBL dealer
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JBL XTi 20 (serv.man2) User Manual / Operation Manual ▷ Download

  • DOWNLOAD JBL XTi 20 (serv.man2) Service Manual ↓ Size: 463.46 KB | Pages: 10 in PDF or view online for FREE
  • Here you can View online or download the User Manual / Operation Manual for the JBL XTi 20 (serv.man2) in PDF for free, which will help you to disassemble, recover, fix and repair JBL XTi 20 (serv.man2) Audio. Information contained in JBL XTi 20 (serv.man2) User Manual / Operation Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.