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05

Owner’

s Manual

GR 1

GR 2

GR 1

GR 2

GR 1

GR 2

GR 1

GR 2

Before beginning the installation of the
amplifier read the following points
carefully. Failure to heed these warnings
could result in personal injury or damage
to property.
• The unit should be installed only in
vehicles that have 12-volt negative
ground electrical systems. Connection to
other types of electrical systems may
damage the amplifier and/or the vehicle’s
electrical system.
• Before beginning the installation,
disconnect the negative (ground) cable
from the vehicle’s battery. This will
prevent accidental short circuits while
working on the installation. Reconnect
the cable only after the installation is
complete and the wiring has been
carefully checked to be sure there are no
exposed wires or short circuits and
everything is properly and securely
connected. Note: If the vehicle’s radio
features a code-type security system,
make certain you know the code before
disconnecting the battery!
• Work in an area that is well-ventilated.
• Wear eye protection whenever cutting,
drilling or filing any parts of the vehicle.
• Wear ear protection when using high-
speed drills, saws, sanders, or grinders.
We want you to be able to enjoy the

system once it is installed.
• Before cutting or drilling any holes in
the vehicle, inspect the area carefully to
be sure there are no electrical wires,
hydraulic brake lines, fuel lines, or fuel
tanks that may be damaged while doing
so. Such components may be hidden
within double-walled panels or structural
members of the vehicle, so be extremely
cautious.
• Do not bypass or modify the fuses on
the chassis of the amplifier. Do not
replace a fuse with one rated for higher
current levels. Doing so could result in
damage to the amplifier or to the
vehicle’s electrical system. Repeated
blowing of the power supply fuse
indicates a problem within the amplifier
or improper installation.
• An additional power supply fuse (not
included) must be located as close as
possible to the battery on the +12V wire
to minimize the chance of electrical
system damage or fire. Do not ignore this
precaution! If the heavy gauge power
wire required with the GTQ amplifier ever
becomes shorted to ground, the wire will
get extremely hot, causing the insulation
to burn off and will likely cause a fire if
not properly fused.

GTQ 190 - English  06/03/98 11:49  Side 5

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

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.

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

07

Owner’

s Manual

Place the amplifier in the installation
location. Use a pen or pencil to mark the
mounting screw hole locations. Set the
amplifier aside and drill the holes for the
mounting screws. (Note: If the surface
you are mounting the amp to is covered
with carpeting or upholstery, cut a small
“x” in the material at each screw hole
location before drilling the holes. This
will help prevent tearing or stretching of
the material and carpet fibers from being
pulled out.) Set the amplifier in position
and align the holes on its side with the
holes previously drilled. Put washers on
the sheet metal screws provided and
drive them into the mounting panel.
Tighten the screws evenly until the unit is
securely mounted.

Proper wiring of the GTQ amplifier and
the associated components is extremely
important for proper performance and
long-term reliability. Using the proper
type of wire is very important. If a
specific type of wire is required for a
certain application, it will be noted.
Route the wiring through the car
carefully. Do not allow wires to lay
against sharp sheet metal edges or any
other surfaces that might wear away or
cut through the insulation of the wire.
Use insulated strain reliefs, rubber
grommets and plastic tubing to protect
the wires whenever they are run through
sheet metal panels or are placed where
they might be pulled or damaged.

–

+

Fuse

Fuse

Fuse

+

–

+
+

–

+

The power input and remote turn-on
wires are connected to the GTQ amplifier
via the power connector on the end of
the amplifier.

• Connect a wire directly from the +12
volt terminal of the battery to the +
Battery terminal on the amplifier. Use a
minimum of AWG #10 for the GTQ190.
Use wire that is heat- and oil-resistant
whenever running wires through the
engine compartment. All wire-to-wire
connections should be soldered and
insulated with heatshrink tubing, or
connected through a high-quality
insulated crimp-on connector or secure
set-screw-type terminal blocks. Never
leave bare wire exposed. Terminate wires
with crimp or solder-on lug terminals
whenever appropriate.
• GTQ amplifiers will draw large amounts
of current from the vehicle’s electrical
system, enough to overload conventional
vehicle wiring. Therefore the +12 volt
power supply must be taken directly from
the positive side of the battery. Do not
connect to the vehicle’s fuse block or to a
wire feeding other accessories.
• To prevent electrical system damage or
fire, a fuseholder and fuse (not included –
30 amps) must be installed in the power
supply wire as close to the battery as
possible, and before the wire travels
through the firewall or other metal panel.

GTQ 190 - English  06/03/98 11:49  Side 7

08

• Proper grounding is extremely
important. Use a heat- and oil-resistant
stranded copper automotive wire
equivalent to the size used for the +12V
connection. Crimp or solder and insulate
any wire-to-wire connections. Keep the
ground wire as short as possible. A
ground wire must be solidly connected
to a major sheet-metal structure of the
vehicle such as a panel near the amp-
mounting location. Scrape all paint and
primer off the sheet metal at the
grounding point to ensure a good
electrical connection. Attach the wire to
the grounding point with a nut, bolt and
star washer. The high current demanded
by high-powered amplifiers requires a
more secure ground than the typical
sheet-metal screw will provide. Coat the
connection with silicon sealant for better
long-term reliability.
• In some vehicles, such as those that
have non-metal bodies, it may be
necessary to use a long ground wire and
connect it to a frame rail or even directly
to the negative (–) terminal of the battery.

• When installing elaborate systems with
multiple components, it is common
practice to ground all of the amplifiers
and signal processors to the same point
to prevent noise pickup from a ground
loop. With the extremely high peak
current demands of high-powered
amplifiers, this can result in unstable
power delivery to the components, due to
modulation of the power ground point by
the high power demands. The advanced,
isolated power supply used in the GTQ
amplifiers makes common ground
installation to prevent ground loops
unnecessary. They can be grounded close
to their mounting positions. Use of heavy
gauge wire for all grounding, even signal
processors and head units, can minimize
possible noise pickup.

• The remote power control system turns
the GTQ amplifier off when not in use to
prevent discharging of the vehicle’s
battery. Because the JBL GTQ amplifiers
include Common Sense 2-way turn-on,
when using the speaker-level inputs with
a head unit that includes a BTL power
amp it is not necessary to connect the
remote wire. The amplifier will
automatically activate whenever you turn
on the head unit. If you are using the
line-level inputs, or the speaker-level
inputs with a head unit that does not
have a BTL power amp, use the following
remote wire connections.

• Using the Remote feature – When +12
volts is applied to the remote IN/OUT
terminal the amplifier is turned on. A red
LED on the top panel of the amplifier will
illuminate to indicate the amplifier is on.
If the head unit has a +12 volt automatic
antenna or amplifier remote activation
wire, connect it to the REM-IN/OUT
connector on the GTQ amplifier. When
the amplifier is turned on, there is a time
delay of several seconds (longer in cold
weather) before the amplifier will
produce sound. This eliminates the
chance of annoying noises produced by
the radio or signal processors being
amplified and passed to the speakers
when the system is first activated.
• Some head units have no automatic
antenna or power amp activation wire.
Others have automatic antenna wires that
are “on” only when the radio is used but
not when a tape is played. In such cases,
connect the remote-in turn-on terminal to
an unused accessory terminal in the fuse
block, or any other +12 volt source that is
turned on and off with the vehicle’s
ignition switch. The remote on/off system
draws negligible current so a relatively
small (18 or 20 gauge) wire may be used.

• When connecting speaker wires, be sure
that no uninsulated wire remains
exposed and no loose strands of wire
touch either an adjoining wire or terminal
or a metal surface. Securely crimp or
solder all connections and insulate them
with heatshrink tubing.

• Use high-quality 18-gauge or larger
speaker wire for the amplifier-to-speaker
connections. Larger wire or special high- 
performance speaker cables may improve
the performance of some systems.
• Be very careful when speaker 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.
• The proper speaker connection depends
on whether a group of the GTQ amplifier
is used bridged or stereo. In either
configuration the speakers are connected
to the speaker output connector.
• To get proper bass response and stereo
imaging, all the speakers in the system
must be in phase. The input 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.
• Stereo Connection – Connect each
speaker to appropriately labeled
terminals of the speaker output
connector.
• Bridged-Mode Connection – Connect the
loudspeaker positive (+) terminal to the
RIGHT positive amplifier speaker output
terminal on the group to be bridged.
Connect the loudspeaker negative (–)
terminal to the LEFT negative amplifier
speaker output terminal on the group to
be bridged. The appropriate group mode
switch should be set to LEFT or L+R.

GTQ 190 - English  06/03/98 11:49  Side 8