JBL 250 Ti (serv.man2) User Manual / Operation Manual ▷ View online
1
250Ti Jubilee Instruction Manual
JBL2516 250TIjubileemanual 7/20/98 11:19 AM Page 1
2
Contents
The 250Ti Jubilee............................................................. 2
Placement......................................................................... 2
Speaker Wire.................................................................... 3
Connections ..................................................................... 3
Amplifier Power Recommendations................................ 5
Biased Crossover Battery Replacement........................... 6
Grille ................................................................................. 6
General Care..................................................................... 7
Service.............................................................................. 7
Specifications................................................................... 7
Placement......................................................................... 2
Speaker Wire.................................................................... 3
Connections ..................................................................... 3
Amplifier Power Recommendations................................ 5
Biased Crossover Battery Replacement........................... 6
Grille ................................................................................. 6
General Care..................................................................... 7
Service.............................................................................. 7
Specifications................................................................... 7
The 250Ti Jubilee
A definitive expression of quality and craftsmanship, the
250Ti Jubilee is the most advanced JBL loudspeaker built
for the home. No effort has been spared and no perfor-
mance factor has been overlooked in building the most
accurate loudspeaker possible, from the singular shape
of the enclosure to the design of the level controls. The
woodworking of the 250Ti Jubilee – with each hand-
detailed enclosure carefully crafted of dense fiberboard
and finished in high-gloss lacquer – complements the
engineering.
250Ti Jubilee is the most advanced JBL loudspeaker built
for the home. No effort has been spared and no perfor-
mance factor has been overlooked in building the most
accurate loudspeaker possible, from the singular shape
of the enclosure to the design of the level controls. The
woodworking of the 250Ti Jubilee – with each hand-
detailed enclosure carefully crafted of dense fiberboard
and finished in high-gloss lacquer – complements the
engineering.
The 250Ti Jubilee will sound as good as your equip-
ment and program source will allow. Imaging is precise
and stable. Frequency response, both on and off axis, is
nearly ruler-flat to well beyond the audible bandwidth.
Distortion is held to levels more typical of fine electronics
than of loudspeakers.
and stable. Frequency response, both on and off axis, is
nearly ruler-flat to well beyond the audible bandwidth.
Distortion is held to levels more typical of fine electronics
than of loudspeakers.
Despite its sophistication, the 250Ti Jubilee is easy to
set up properly. Please read this manual thoroughly before
beginning. The instructions and information it contains will
ensure a trouble-free setup and will allow you to realize the
full potential of your system.
beginning. The instructions and information it contains will
ensure a trouble-free setup and will allow you to realize the
full potential of your system.
Placement
For the best performance, place your 250Ti Jubilee speakers
at least three feet from any walls, and equidistant from your
primary listening position (there is no designated right or
left speaker). The location of your primary listening position
is determined by the distance between the speakers; the
area created between the loudspeakers and the listening
position should ideally equal a 40- to 60-degree angle. For
example, if the loudspeakers are 2.4m (8 feet) apart, your
listening position should be 2.4 – 3.65m (8 to 12 feet) from
each speaker. To widen the area in which the best stereo
image will be perceived, turn the speaker to face the primary
listening position.
at least three feet from any walls, and equidistant from your
primary listening position (there is no designated right or
left speaker). The location of your primary listening position
is determined by the distance between the speakers; the
area created between the loudspeakers and the listening
position should ideally equal a 40- to 60-degree angle. For
example, if the loudspeakers are 2.4m (8 feet) apart, your
listening position should be 2.4 – 3.65m (8 to 12 feet) from
each speaker. To widen the area in which the best stereo
image will be perceived, turn the speaker to face the primary
listening position.
JBL2516 250TIjubileemanual 7/20/98 11:19 AM Page 2
3
Speaker Wire
Speaker wire and interconnecting cables are an important
component in an audio system. The 250Ti Jubilee system
is internally wired with specially designed cable manufac-
tured for JBL by Monster Cable
component in an audio system. The 250Ti Jubilee system
is internally wired with specially designed cable manufac-
tured for JBL by Monster Cable
®
. The same care that was
taken in selecting internal system wiring should be taken
in selecting and applying the cables that will connect the
various system components. Your 250Ti Jubilee dealer
has the experience and knowledge to recommend suitable
interconnects and speaker wire to best complement your
system.
in selecting and applying the cables that will connect the
various system components. Your 250Ti Jubilee dealer
has the experience and knowledge to recommend suitable
interconnects and speaker wire to best complement your
system.
The following gauge wires (minimum requirements) are
recommended:
recommended:
Gauge
Distance
1 mm
2
(18 AWG)
Up to 5 meters (15 feet)
1.5 mm
2
(16 AWG)
Up to 10 meters (30 feet)
2 mm
2
(14 AWG)
Up to 25 meters (75 feet)
The length of the wire will depend on the location of the
loudspeakers and amplifier. Since you should listen care-
fully to your loudspeakers
loudspeakers and amplifier. Since you should listen care-
fully to your loudspeakers
before determining their final
position, you may want to arrange a temporary wiring
layout that allows you to move the loudspeakers and
experiment with their placement. After you have deter-
mined the best location for the system, permanent con-
nections may then be made using the shortest cable runs
possible. Use the same length wires for both speakers.
layout that allows you to move the loudspeakers and
experiment with their placement. After you have deter-
mined the best location for the system, permanent con-
nections may then be made using the shortest cable runs
possible. Use the same length wires for both speakers.
In some systems, the amplifier may be located near
the loudspeaker system and connected using a short
length of wire. Although such a hookup requires a
relatively long cable between the preamplifier and main
amplifier, the benefit of the short amplifier-to-loudspeaker
connection often outweighs any drawbacks.
length of wire. Although such a hookup requires a
relatively long cable between the preamplifier and main
amplifier, the benefit of the short amplifier-to-loudspeaker
connection often outweighs any drawbacks.
Connections
WARNING: Be sure your amplifier is turned off before
connecting or disconnecting the loudspeakers. Making con-
nections 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 dis-
connecting cables at the amplifier or preamplifier inputs.
connecting or disconnecting the loudspeakers. Making con-
nections 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 dis-
connecting cables at the amplifier or preamplifier inputs.
Before you begin. Examine your speaker wire carefully.
One conductor is solid, and the other is differentiated
by a ridge, printed marking or color stripe. Assign one
conductor positive (+) and the other negative (–) polarity,
and always connect the designated conductors to their
respective amplifier and loudspeaker terminals, positive-
to-positive, and negative-to-negative. This will ensure that
the loudspeakers will work together (in phase) rather than
in opposition. (Connecting the loudspeakers out of phase
will not cause damage but will result in reduced low-
frequency output and lack of stereo effect.)
by a ridge, printed marking or color stripe. Assign one
conductor positive (+) and the other negative (–) polarity,
and always connect the designated conductors to their
respective amplifier and loudspeaker terminals, positive-
to-positive, and negative-to-negative. This will ensure that
the loudspeakers will work together (in phase) rather than
in opposition. (Connecting the loudspeakers out of phase
will not cause damage but will result in reduced low-
frequency output and lack of stereo effect.)
JBL2516 250TIjubileemanual 7/20/98 11:19 AM Page 3
4
JBL 250Ti Jubilee loudspeakers are designated to pro-
duce a positive pulse when a positive voltage is applied to
the positive (red) terminal. Some audio amplifiers invert
polarity (i.e., reverse the polarity of both channels). Before
you make your final connections, audition the system
carefully with both normal (+ amp to + speaker) as well as
reversed (+ amp to – speaker) connections to determine
the best method. The “correct” connection is the one that
yields the best audible results. Be sure to reverse both left
and right connections to keep the system in phase.
the positive (red) terminal. Some audio amplifiers invert
polarity (i.e., reverse the polarity of both channels). Before
you make your final connections, audition the system
carefully with both normal (+ amp to + speaker) as well as
reversed (+ amp to – speaker) connections to determine
the best method. The “correct” connection is the one that
yields the best audible results. Be sure to reverse both left
and right connections to keep the system in phase.
Connections to the 250Ti Jubilee loudspeaker system
are made at the two terminals located on the back of the
enclosure, which are designed to permit a variety of con-
nection methods, as described below. Each method has
its own advantages. Experimentation, and the advice of
your JBL 250Ti Jubilee dealer, will be helpful in choosing
the best method for your system.
enclosure, which are designed to permit a variety of con-
nection methods, as described below. Each method has
its own advantages. Experimentation, and the advice of
your JBL 250Ti Jubilee dealer, will be helpful in choosing
the best method for your system.
Bare Wire Method
The most positive connection is made by directly connect-
ing clean, bare wire. For each terminal, separate each wire
into three equal bundles.
ing clean, bare wire. For each terminal, separate each wire
into three equal bundles.
Turn the terminal counterclockwise and pass the cen-
ter bundle through the exposed hole in the binding post.
Wrap the remaining bundles around the post and twist
them together with the center strands. Tighten the knob
securely so that a snug, positive connection over a maxi-
mum area is achieved. Do not apply excessive force, and
do not overtighten. Trim off any excess wire that is not in
contact with the binding post contact surfaces to avoid a
short circuit.
Wrap the remaining bundles around the post and twist
them together with the center strands. Tighten the knob
securely so that a snug, positive connection over a maxi-
mum area is achieved. Do not apply excessive force, and
do not overtighten. Trim off any excess wire that is not in
contact with the binding post contact surfaces to avoid a
short circuit.
Spade or Banana-type Connector Method
This method involves fastening the ends of wires to spade
or banana-type connectors which are then, in turn,
attached to the binding posts. Bear in mind, however, that
there is an advantage to keeping the number of contacts
to a minimum. If this type of connection is desired, we
recommend using the highest-quality terminals, expertly
connected to the selected cables.
or banana-type connectors which are then, in turn,
attached to the binding posts. Bear in mind, however, that
there is an advantage to keeping the number of contacts
to a minimum. If this type of connection is desired, we
recommend using the highest-quality terminals, expertly
connected to the selected cables.
“Bi-Wire” Connecting Method
The system’s internal dividing network is electrically sepa-
rated at the low-frequency to midrange transition. External
strapping bars connect the networks when a single-wire
connection method 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 net-
work sections using two wires (four conductors). The
rated at the low-frequency to midrange transition. External
strapping bars connect the networks when a single-wire
connection method 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 net-
work sections using two wires (four conductors). The
JBL2516 250TIjubileemanual 7/20/98 11:19 AM Page 4
Display
