Read JBL GTQ 190 (serv.man2) User Guide / Operation Manual online
08
Ground Wire
• 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.
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.
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.
Remote Connection
• 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.
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.
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.
Speaker Connections
• 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.
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.
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
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