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• The GTS100 must be mounted in a
place where air can circulate around
the fins on the chassis. Good air
circulation around the amplifier will
make it operate at lower tempera-
tures and reduce the chance of the
thermal protection circuits being trig-
gered. The installation positions that
provide the most efficient air circula-
tion around the amplifier are shown
below.
• Use a mounting location that allows
access to the wiring connections and
level adjustments. This allows the
unit to be mounted before these con-
nections and adjustments are made.
If the amplifier must be mounted in
an inaccessible location, it may be
easier to mount it after the wiring
connections and level adjustments
are complete.
10
Controls and Connectors
1. Line Level RCA Inputs
– Use these
connectors for line (preamp) level input
to the amplifier. When speaker inputs
are used, this connector can be con-
verted for use as a line-level output by
setting the “Line” switch to “out.”
2. Line Selector
– This switch sets the
line level connectors for either input or
output. Set switch to “In” for normal line
level input operation.” Set the switch to
“Out” to use the line level connector for
line level outputs to drive other ampli-
fiers or signal processors when using
the speaker level inputs.
3. Gain Control
– Use this control to
adjust the input sensitivity of the ampli-
fier. See the “Gain Adjustments” section
for tips on proper setup.
4. Input Mode Selector
– This switch is
used to set the input mode for both pre-
amp and speaker-level inputs. Set this
switch to Stereo for normal operation
using both left and right inputs. Set this
switch to R to drive both the left and
right channels with only a single input
on the right channel. Set this switch to
“L+R” to sum the left and right inputs
for a mono output on both amplifier
channels.
5. Speaker Input Connector –
Use this
connector for speaker level input sig-
nals. A wire harness is supplied for
this connector. See the “Audio Input
Connections” section (page 15) for
wiring instructions. This input also
includes JBL’s Common Sense input
circuitry which turns the amplifier on as
soon as a high powered head unit con-
nected to this input is turned on.
AIR FLOW
BEST-Vertical Mounting
AIR FLOW
GOOD-Horizontal Mounting
NEVER-Mount Upside Down
GTS100
JBL 1394 Manual 7/17/98 11:49 AM Page 10