Read JBL GTS 100X User Guide / Operation Manual online
06
When the GTS100x is in bridged
mode, the combined impedance
of the speaker (or speakers) con-
nected to the bridged channel
should be at least 4 ohms. As in
the example just mentioned,
sustained operation of the
GTS100x in bridged mode with
less than 4 ohms will likely cause
overheating. If monaural opera-
tion is desired, and two 4-ohm
speakers are used, it is best to
connect each speaker to an
individual amplifier channel
and use the “L
+
R” mode on the
input-mode switch to provide
monaural operation.
The GTS100x must not be used
with speakers that have either
one of their input terminals wired
to the frame of the speaker or to
the chassis of the vehicle.
Speakers
When used in the non-bridged
mode, the GTS100x can easily
drive 2-ohm speaker loads. When
only one speaker is connected to
each channel, virtually any com-
mon speaker may be used. When
two speakers are connected in
parallel to a given channel, each
speaker must have a minimum
impedance of at least 4 ohms to
ensure that the combined load
does not drop below 2 ohms.
Although the amplifier will not be
damaged, load impedances lower
than 2 ohms will eventually
cause the amplifier to overheat,
activating the protection circuits
and causing the unit to shut off
until it cools down sufficiently.
System Design Using the GTS100x
Signal Sources
The low-level preamp outputs of
any radio/tape deck, CD player
or preamp/ equalizer so equipped
can drive the GTS100x. The Gain
control of the GTS100x is used to
match the amplifier to the output
voltage of the source. This
matching is important to keep
noise low and is explained in the
Gain Adjustments section of this
manual (page 23).
Thanks to Universal Interface
circuitry, the GTS100x can also
be connected to power amplifiers,
radios or equalizers that are
equipped with only speaker
(+)
(-)
(+)
(-)
Parallel Wiring
Series Wiring
2 Ohms
Nominal
Impedance
Nominal
Impedance
8 Ohms
Nominal
Impedance
Nominal
Impedance
4 Ohms
4 Ohms
4 Ohms
4 Ohms
GTS100x OM 7/16/98 2:56 PM Page 6
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