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same time. This is sometimes used for
center-channel applications or for inex-
pensive subwoofer addition, essentially
creating a 3-channel system. However,
unlike a true bi-amplified subwoofer
connection, this system configuration
does not provide for control of sub-
woofer-satellite balance, it requires the
use of a passive subwoofer crossover
instead of the superior active circuitry
already built-in to the GTS100, and it
does not separate the power amps
driving the satellites from the amps
driving the subwoofer. Therefore this
connection is best used for addition of
a center-channel, or as an interim step
as you build up to a true bi-amplified
subwoofer-satellite system. Connect the
main pair of stereo speakers as in the
stereo mode, connect the mono speaker
as described above for bridge-mode
connection (see diagram on page 19).
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 par-
ticular components. The input-mode
switch should be set to “STEREO”.
Please do not call JBL for this part; we
stock only the harness assemblies as
supplied with the amplifier.
To get proper bass response and
stereo imaging, all the speakers in the
system must be “in phase.” The inputs
terminals of the speakers will be marked
in some way to identify positive and
negative polarity. Make sure that the
positive (+) speaker terminal is attached
to the positive (+) amplifier connection
in every speaker-to-amp connection. All
two conductor speaker wire has one
conductor marked in some way so it
can be easily traced.
The speaker output wire harness color
codes are listed below:
Speaker Output Color Codes
Left (+): White
Left (-): White with Black Stripe
Right (+): Gray
Right (-): Gray with Black Stripe
Stereo Connection
– Connect each
speaker directly to the speaker output
harness according to the color-code
listed above. The input-mode switch
should be set to “STEREO”
Bridged-mode Connection
– Connect
the loudspeaker positive (+) terminal to
the RIGHT channel positive wire (Gray).
Connect the loudspeaker negative (–)
terminal to the LEFT channel negative
wire (White with Black stripe). The
input-mode switch should be set to “R”
or “L+R”.
Simultaneous Stereo + Mono
Connection –
The GTS100 may be
used to drive a stereo pair of speakers
with a mono (bridged) speaker at the
18
JBL 1394 Manual 7/17/98 11:49 AM Page 18