06
GR1
R GR1 L
LINE LEVEL
INPUT
SPEAKER LEVEL INPUTS
GR2
GR1
GR2
FUSE
30A
L
+ –
– +
+ –
– +
R
PREAMP
OUTPUTS
R GR2 L
30A
1
2
3
8
7
6
5
4
GR2
GR1
SPEAKER OUTPUTS
POWER
BATT(+)
BRIDGE
BRIDGE
+
+
R
L
–
–
+
+
R
L
–
–
REMOTE
GND
POWER
CROSSOVER
SPEAKER
MODE
CROSSOVER DESIGNATIONS
F = FLAT (BYPASS)
L = LOW PASS
H = HIGH PASS
MODE
R ST L+R
L
MIN MAX
GAIN 1
MIN MAX
GAIN 2
F
H
L
GR2
GR1
F
H
GROUP 1
GROUP 2
CROSSOVER
SPEAKER
R ST L+R
13
12
11
11
9
9
10
10
Installation and Use
Controls and Connectors
1. Preamp-Level Input Connector – Use
these connectors for line-level (preamp)
inputs to the amplifier.
2. Preamp-Level Output Connector – Use
these outputs to send fixed full-range
signal to additional amplifiers.
3. Speaker-Level Input Connector – Use
this connector for speaker-level input
signals. A wire harness is supplied for
use with this connector. See “Audio Input
Connections” section (page 9) for wiring
instructions. This input also includes
JBL’s Common Sense input circuitry
which turns the amplifier on as soon as
the high-powered head unit connected to
this input is turned on.
4. Speaker Output Connectors – Connect
speaker wiring to these connectors. See
wiring directions (page 7) for more
information.
5., 6., 7. Power Connector – Connection
for power wires and Remote. See wiring
directions (page 7) for information on
proper connections.
8. Fuse – 30A ATC type.
9. Gain Controls – Use these controls to
adjust the gain of the amplifier channel
group. See the “Adjusting the Gain”
section (on page 11) for tips on proper
setup.
10. Speaker Crossover Switches – These
switches control the built-in crossovers
that are connected to each group's power
amplifier circuitry. Set the switch to F
(flat) for full band operation on a group.
Set this switch to L (low) to activate the
low-pass filter on the selected amplifier
group for subwoofer use or to use in
conjunction with a high-pass filtered
input signal to create a band-pass
crossover (for a midrange or midbass
driver). Set the switch to H (high) to
activate the high-pass filter for use with
satellite speakers or tweeters on an
amplifier group.
11. Mode Switches – These switches are
used to set the input mode for both
preamp and speaker-level inputs. Set the
switch to ST(ereo) for normal operation
on the group using individual left and
right inputs. Set this switch to R to drive
both the left and right outputs with only a
single input on the left jack. Set the
switch to L+R to sum the left and right
inputs for a mono output on the group.
These switches do not affect the preamp
outputs.
12. Group 2 Input Switch – This switch is
used to select which inputs will drive
Group 2 of the amplifier. Put the switch in
position “GR 1” to allow Group 2 to be
driven by the Group 1 inputs. Put the
switch in the “GR 2” position to drive
Group 2 with the Group 2 inputs.
13. Power Indicator LED (on amp chassis
top) – LED steadily illuminates for normal
operation. LED blinks when protection
circuitry or muting is engaged.
Mounting Locations
There are several factors to consider
when selecting a mounting location for a
GTQ amplifier.
• It must be securely mounted in a place
where it will not be subjected to
excessive shock and vibration.
• Under no circumstances should the
amplifier be mounted where it will be
exposed to moisture or extreme heat.
• Try to mount the amplifier where the
main +12-volt power supply terminal,
which must be connected directly to the
battery, can be kept relatively short.
• GTQ amplifiers 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 temperatures and reduce the
chance of the thermal protection circuits
being triggered. The installation positions
that provide the most efficient air
circulation around the amplifier are
shown on this page.
• Use a mounting location that allows
access to the wiring connections and
level adjustments. This allows the unit to
be mounted before these connections
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.
GTQ 190 - English 06/03/98 11:49 Side 6
