JBL Grand touring series User Manual page 20

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Be verv careful when speaker
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wire is routed through a door
hinge area to door-mounted
speakers. Use grommets and
strain reliefs wherever necessary
to prevent damage to the wires.
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The proper speaker connection
depends on whether the
GTSlSOx is used bridged or
stereo. The speakers are con-
nected to the speaker output
connector.
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To get proper bass response and
stereo imaging, all the speakers
in the svstem must be "in
phase." The input terminals of
the speakers will be marked in
some way to identify positive
and negative polaritv. Make
sure that the positive f+) speak-
er terminal is attached to the
positive (+) amplifier connec-
tion in every speaker-to-amp
connection. All two-conductor
speaker wire has one conductor
marked in some way so it can
be easilv traced.
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Stereo Connection - Connect
each speaker to appropriately
labeled terminals of the speaker
output connector.
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Bridged-Mode Connection -
Connect the loudspeaker positive
(+) terminal to the RIGHT chan-
nel positive amplifier speaker out-
put terminal. Connect the loud-
speaker negative (6) terminal to
the LEFT channel negative
amplifier speaker output termi-
nal. The input-mode switch should
be set to "RIGHT" or "L+R."
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Simultaneous Stereo •k Mono
Connection - The GTS amplifier
may be used to drive a stereo
pair of speakers with a mono
speaker at the same time. This
is sometimes used for center-
channel applications or for inex-
pensive subwoofer addition,
essentiallv creating a 3-channel
svstem. Unlike a true biampli-
fied subwoofer connection, how-
ever, this type of svstem config-
uration does not provide fine
control of subwoofer-satellite
balance. It requires the use of a
passive subwoofer crossover
instead of the superior active
circuitrv alreadv built-in to the
GTSlSOx, and it does not sepa-
rate the power amps driving the
satellites from the amps driving
the subwoofer. Therefore, this
connection is best used for addi-
tion of a center-channel speaker,
or as an interim step as you
build
UP
to a true biamplified
subwoofer/satellite svstem.
Connect the main pair of stereo
speakers as in the stereo mode;
connect the mono speaker as
described above for bridged-
mode connection. For use in
center-channel applications, a
high-power "L-Pad" or power
fader can be used to attenuate
the center channel for proper
level matching. For subwoofer-
satellite use, connect a non-
polarized capacitor in series
with each main speaker, and a
high-power inductor (coil) in
series with the subwoofer. Your
authorized JBL dealer will help
YOU choose the correct values
for your particular components.
In this configuration, each
speaker should have an imped-
ance which is equal or greater
than 4 ohms. The input-mode
switch should be set to
"STEREO" (see page 24).