Read JBL 250 Ti (serv.man2) User Guide / Operation Manual online
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
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