JBL A6000GTI (serv.man5) User Manual / Operation Manual ▷ View online
5
MAKING THE CONNECTIONS
POWER CONNECTIONS
Use 0-gauge cable to connect the
amplifier’s GND – terminal directly to
the vehicle’s chassis (see Figure 5).
Scrape off all paint from the metal area
for a good, clean ground connection.
Make sure the ground wire is as short
as possible and is connected to metal
on the vehicle’s body. Do not connect
the GND – cable to the frame of the
vehicle. It is isolated from the chassis
using rubber shims and will not provide
an adequate ground. Instead, use the
trunk’s floor or cargo area as a suitable
location. Do not connect the GND –
cable to the battery’s negative (–)
terminal.
amplifier’s GND – terminal directly to
the vehicle’s chassis (see Figure 5).
Scrape off all paint from the metal area
for a good, clean ground connection.
Make sure the ground wire is as short
as possible and is connected to metal
on the vehicle’s body. Do not connect
the GND – cable to the frame of the
vehicle. It is isolated from the chassis
using rubber shims and will not provide
an adequate ground. Instead, use the
trunk’s floor or cargo area as a suitable
location. Do not connect the GND –
cable to the battery’s negative (–)
terminal.
Figure 5. Power wiring
diagram for the JBL A6000GTi
amplifier. The A3000GTi is
wired in a similar way.
diagram for the JBL A6000GTi
amplifier. The A3000GTi is
wired in a similar way.
Use 0-gauge cable to connect the
BATT+ terminal directly to the vehicle’s
battery. If the battery is located in the
engine compartment and the BATT+
cable must be routed through the
firewall or any metal obstruction, install
a wafer-type (ANN) fuse with a current
rating of at least 500 amperes and an
appropriate fuse holder
within 18" of the vehicle’s battery
(see Figure 5).
BATT+ terminal directly to the vehicle’s
battery. If the battery is located in the
engine compartment and the BATT+
cable must be routed through the
firewall or any metal obstruction, install
a wafer-type (ANN) fuse with a current
rating of at least 500 amperes and an
appropriate fuse holder
within 18" of the vehicle’s battery
(see Figure 5).
Connect the source unit’s remote
turn-on lead to the REMOTE terminal on
the amplifier (see Figure 5). Use
any convenient gauge wire for the
connection.
turn-on lead to the REMOTE terminal on
the amplifier (see Figure 5). Use
any convenient gauge wire for the
connection.
The amplifier’s internal neon lights
require a separate switched power
connection with at least a 2-ampere cur-
rent capacity. If desired, install a switch
to turn on the neon lights or a relay trig-
gered by a circuit in the vehicle (e.g.,
door switch, trunk pin switch or other
turn-on source). If you want the amplifi-
er’s neon to light when the
amplifier is on, connect the LIGHTING
terminal to a relay triggered by the radio’s
remote turn-on lead (see Figure 5).
require a separate switched power
connection with at least a 2-ampere cur-
rent capacity. If desired, install a switch
to turn on the neon lights or a relay trig-
gered by a circuit in the vehicle (e.g.,
door switch, trunk pin switch or other
turn-on source). If you want the amplifi-
er’s neon to light when the
amplifier is on, connect the LIGHTING
terminal to a relay triggered by the radio’s
remote turn-on lead (see Figure 5).
IMPORTANT: Do not connect a jumper
directly between the REMOTE and
LIGHTING terminals. Doing so may burn
out the remote turn-on circuits
in your source unit.
directly between the REMOTE and
LIGHTING terminals. Doing so may burn
out the remote turn-on circuits
in your source unit.
SIGNAL CONNECTIONS
Use high-quality twisted-pair RCA audio
cables to connect your source unit’s
main stereo or subwoofer RCA output
jacks to the amplifier’s L/R INPUT jacks.
For a single subwoofer output, use an
RCA “Y” adapter to
connect its signal to both input jacks.
cables to connect your source unit’s
main stereo or subwoofer RCA output
jacks to the amplifier’s L/R INPUT jacks.
For a single subwoofer output, use an
RCA “Y” adapter to
connect its signal to both input jacks.
As a convenience, each JBL A6000GTi
or A3000GTi amplifier is also equipped
with a set of PASS-THRU L/R RCA audio
jacks. They will pass incoming audio
signals unaltered, and you can use
them to send stereo audio signals to
other components in your system.
or A3000GTi amplifier is also equipped
with a set of PASS-THRU L/R RCA audio
jacks. They will pass incoming audio
signals unaltered, and you can use
them to send stereo audio signals to
other components in your system.
REMOTE LEVEL
CONTROL/ACCESSORY
GAUGE OUTPUTS
CONTROL/ACCESSORY
GAUGE OUTPUTS
The A6000GTi and A3000GTi use an
RJ45 connector to output control
signals for the Remote Level Control
and accessory gauges. Use the 15'
RJ11 cable to connect the control to the
amplifier. For accessory gauges, use
the pinouts in Figure 6 to make custom
cables with materials found
at most electronics supply stores or
home centers.
RJ45 connector to output control
signals for the Remote Level Control
and accessory gauges. Use the 15'
RJ11 cable to connect the control to the
amplifier. For accessory gauges, use
the pinouts in Figure 6 to make custom
cables with materials found
at most electronics supply stores or
home centers.
For gauges, varying voltages are output
on selected RJ45 pins to indicate
voltage, current and temperature.
on selected RJ45 pins to indicate
voltage, current and temperature.
For battery voltage, linear scale (pin 1):
2 volts = 8 volts at the battery
4.5 volts = 18 volts at the battery
4.5 volts = 18 volts at the battery
For temperature, linear scale (pin 2):
0 volts = –10 degrees Celsius
5 volts = 110 degrees Celsius
5 volts = 110 degrees Celsius
For current, linear scale (pin 3):
0 volts = 0 amperes current draw
5 volts = 800 amperes current draw
5 volts = 800 amperes current draw
Also, you can connect a power meter
using the pins for battery voltage and
current. Be sure to use a power meter
that multiplies the incoming voltage and
current signals (i.e., P = E x I) to convert
the data to watts.
using the pins for battery voltage and
current. Be sure to use a power meter
that multiplies the incoming voltage and
current signals (i.e., P = E x I) to convert
the data to watts.
SPDT Relay
(or other
turn-on
signal)
A6000GTi
Power Terminals
+12 V
Ground
87
87a
85
nc
no
86
30
Chassis
Ground
(Bare Metal)
0-gauge
0-gauge
Remote Turn-On
Batteries
ANN-Type Fuse
(500 A or more)
Source Unit
18"
Ground (also use for acc. gauges) = 8
8
1
No Connection = 7
Remote Level Control = 6
Remote Level Control = 5
Remote Level Control = 5
4 = Remote Level Control
3 = Current (to acc. ampere meter)
2 = Temperature (to acc. temp. gauge)
1 = Battery Voltage (to acc. volt meter)
RJ45 Connector
(GTi Input Panel)
Figure 6. Pinouts for the REMOTE LEVEL RJ45 connector on the
A6000GTi or A3000GTi amplifier.
A6000GTi or A3000GTi amplifier.
CONNECTING
THE SPEAKERS
THE SPEAKERS
IMPORTANT: As a safety feature and
due to the high output voltage
capability of the A6000GTi and
A3000GTi amplifiers, the SPEAKER
OUTPUTS are equipped with a cover
that must be in place in order for
the amplifier to operate. When the
cover is removed, the amplifier will
turn off and speaker connections
can be made safely.
due to the high output voltage
capability of the A6000GTi and
A3000GTi amplifiers, the SPEAKER
OUTPUTS are equipped with a cover
that must be in place in order for
the amplifier to operate. When the
cover is removed, the amplifier will
turn off and speaker connections
can be made safely.
6
MAKING THE CONNECTIONS
A6000GTi SPEAKER
CONNECTIONS
CONNECTIONS
The A6000GTi is a 2-channel amplifier
designed to drive subwoofers only.
The left and right input signals are com-
bined inside the amplifier to
provide a mono output signal, no
matter which output mode is selected.
designed to drive subwoofers only.
The left and right input signals are com-
bined inside the amplifier to
provide a mono output signal, no
matter which output mode is selected.
The A6000GTi can be connected to
two independent speaker systems in
2-channel mode. It can be connected to
a combination of subwoofers
configured as a single load with its
channels bridged or connected in
parallel. Bridged channels will provide
high output voltage for driving loads
with a nominal impedance of 2 to 4
ohms. Connecting the channels in
parallel will provide the high current
necessary to drive loads of 1 to 2 ohms.
two independent speaker systems in
2-channel mode. It can be connected to
a combination of subwoofers
configured as a single load with its
channels bridged or connected in
parallel. Bridged channels will provide
high output voltage for driving loads
with a nominal impedance of 2 to 4
ohms. Connecting the channels in
parallel will provide the high current
necessary to drive loads of 1 to 2 ohms.
Included below are three application
diagrams that will help you plan
your A6000GTi installation. Figures 7
through 9 show how to configure the
JBL A6000GTi subwoofer amplifier for
bridged-mono, parallel-mono and
2-channel operation (see Setting Up the
GTi Amplifier).
diagrams that will help you plan
your A6000GTi installation. Figures 7
through 9 show how to configure the
JBL A6000GTi subwoofer amplifier for
bridged-mono, parallel-mono and
2-channel operation (see Setting Up the
GTi Amplifier).
IMPORTANT: If the nominal impedance
of the speaker system is close to 2
ohms, you may try both bridged and
parallel configurations to determine
which one performs better. Remember
to set the output mode switch to the
appropriate setting when changing
configurations.
of the speaker system is close to 2
ohms, you may try both bridged and
parallel configurations to determine
which one performs better. Remember
to set the output mode switch to the
appropriate setting when changing
configurations.
NOTE: For simplicity, Figures 7 through
9 do not show power, remote and input
connections (see page 5).
9 do not show power, remote and input
connections (see page 5).
A6000GTi Amplifier
(partial output panel)
Subwoofer
System
2 to 4
ohms
ohms
Subwoofer
System
2 to 4
ohms
ohms
Set Output Mode
to 2CH/BR
(on input panel)
See “Setting The Crossover”
on Page 8
to Adjust Crossover Controls
A6000GTi Amplifier
(partial output panel)
Set Output Mode
to PARALLEL
(on input panel)
See “Setting The Crossover”
on Page 8
to Adjust Crossover Controls
Subwoofer
System
2 ohms
or less
jumper
A6000GTi Amplifier
(partial output panel)
Set Output Mode
to 2CH/BR
(on input panel)
See “Setting The Crossover”
on Page 8
to Adjust Crossover Controls
Subwoofer
System
2 ohms
or more
Figure 7. The JBL A6000GTi
subwoofer amplifier is set
to bridged mode to drive a
subwoofer system. Only use
this mode when the nominal
equivalent or total impedance
of the speaker system is
2 ohms or greater.
subwoofer amplifier is set
to bridged mode to drive a
subwoofer system. Only use
this mode when the nominal
equivalent or total impedance
of the speaker system is
2 ohms or greater.
Figure 9. The JBL A6000GTi
subwoofer amplifier is set
to 2-channel mode to drive
a pair of subwoofers or
subwoofer systems with
nominal equivalent or total
impedances of 2 to 4 ohms.
subwoofer amplifier is set
to 2-channel mode to drive
a pair of subwoofers or
subwoofer systems with
nominal equivalent or total
impedances of 2 to 4 ohms.
Figure 8. The JBL A6000GTi
subwoofer amplifier is set
to parallel mode to drive a
subwoofer system. Only
use this mode when the
nominal equivalent or total
impedance of the speaker
system is less than 2 ohms.
subwoofer amplifier is set
to parallel mode to drive a
subwoofer system. Only
use this mode when the
nominal equivalent or total
impedance of the speaker
system is less than 2 ohms.
NOTE: A jumper is added
between the + terminals.
between the + terminals.
7
MAKING THE CONNECTIONS
A3000GTI SPEAKER
CONNECTIONS
Included below are three application
diagrams that will help you plan your
A3000GTi installation. Figures 10
through 12 show how to configure
the JBL A3000GTi amplifier for
bridged-mono, parallel-mono and
2-channel operation (also see
Setting Up the GTi Amplifier).
CONNECTIONS
Included below are three application
diagrams that will help you plan your
A3000GTi installation. Figures 10
through 12 show how to configure
the JBL A3000GTi amplifier for
bridged-mono, parallel-mono and
2-channel operation (also see
Setting Up the GTi Amplifier).
NOTE: For simplicity, Figures 10 through
12 do not show power, remote and input
connections (see page 5).
12 do not show power, remote and input
connections (see page 5).
A3000GTi Amplifier
(partial output panel)
2 to 4
ohms
ohms
2 to 4
ohms
ohms
L Speaker
System
R Speaker
System
Set Output Mode
to STEREO
(on input panel)
See “Setting The Crossover”
on Page 8
to Adjust Crossover Controls
A3000GTi Amplifier
(partial output panel)
Set Output Mode
to PARALLEL
(on input panel)
Subwoofer
System
2 ohms
or less
jumper
See “Setting The Crossover”
on Page 8
to Adjust Crossover Controls
A3000GTi Amplifier
(partial output panel)
Set Output Mode
to BRIDGE
(on input panel)
Subwoofer
System
2 ohms
or more
See “Setting The Crossover”
on Page 8
to Adjust Crossover Controls
Figure 10. The JBL A3000GTi
amplifier is set to bridged
mode to drive a subwoofer
system. Only use this mode
when the nominal equivalent
or total impedance of the
speaker system is 2 ohms
or greater.
amplifier is set to bridged
mode to drive a subwoofer
system. Only use this mode
when the nominal equivalent
or total impedance of the
speaker system is 2 ohms
or greater.
Figure 12. The JBL A3000GTi
amplifier is set to stereo
mode to drive a pair of full-
range speaker systems with
nominal equivalent or total
impedances of 2 to 4 ohms.
amplifier is set to stereo
mode to drive a pair of full-
range speaker systems with
nominal equivalent or total
impedances of 2 to 4 ohms.
Figure 11. The JBL A3000GTi
amplifier is set to parallel
mode to drive a subwoofer
system. Only use this mode
when the nominal equivalent
or total impedance of the
speaker system is less than
2 ohms.
amplifier is set to parallel
mode to drive a subwoofer
system. Only use this mode
when the nominal equivalent
or total impedance of the
speaker system is less than
2 ohms.
NOTE: A jumper is added
between the + terminals.
between the + terminals.
OUTPUT LOAD SWITCH
The Output Load switch is used to
optimize amplifier performance when
driving a full-range signal. Set the
switch according to the nominal imped-
ance of the load: Use the 4-ohm mode
when driving loads with a nominal
impedance greater than 2 ohms and the
2-ohm mode when driving loads with a
nominal impedance of 2 ohms or less.
optimize amplifier performance when
driving a full-range signal. Set the
switch according to the nominal imped-
ance of the load: Use the 4-ohm mode
when driving loads with a nominal
impedance greater than 2 ohms and the
2-ohm mode when driving loads with a
nominal impedance of 2 ohms or less.
8
SETTING UP THE GTI AMPLIFIER
SETTING INPUT
SENSITIVITY
SENSITIVITY
NOTE: You can use the supplied
REMOTE LEVEL control to fine-tune
the input sensitivity or to adjust the
level of the bass according to the
program material after the amplifier’s
LEVEL control has been set properly.
Connect the remote module’s attached
cable to the REMOTE LEVEL (RJ45) jack
on the amplifier’s input panel. Start with
the REMOTE LEVEL Control in its maxi-
mum (clockwise) position.
REMOTE LEVEL control to fine-tune
the input sensitivity or to adjust the
level of the bass according to the
program material after the amplifier’s
LEVEL control has been set properly.
Connect the remote module’s attached
cable to the REMOTE LEVEL (RJ45) jack
on the amplifier’s input panel. Start with
the REMOTE LEVEL Control in its maxi-
mum (clockwise) position.
1. Initially, turn the amplifier’s LEVEL
control to the minimum (clockwise)
position.
position.
2. Reconnect the (–) negative lead to
your vehicle’s battery. Apply power
to the audio system and play a
favorite music track.
to the audio system and play a
favorite music track.
3. Increase the source unit’s volume
control to the maximum listening
position. Slowly turn the amplifier’s
LEVEL control counterclockwise and
observe the I/OPT and E/OPT LEDs
(on the amplifier’s top).
position. Slowly turn the amplifier’s
LEVEL control counterclockwise and
observe the I/OPT and E/OPT LEDs
(on the amplifier’s top).
• In the bridged or 2-channel mode,
at the ideal setting, the E/OPT LED
should flash on musical peaks to
indicate the amplifier is producing
maximum voltage. If the I/OPT LED
flashes in bridged mode, this
indicates the speaker system’s
impedance is lower than 2 ohms
and the amplifier should be
configured in the parallel mode.
should flash on musical peaks to
indicate the amplifier is producing
maximum voltage. If the I/OPT LED
flashes in bridged mode, this
indicates the speaker system’s
impedance is lower than 2 ohms
and the amplifier should be
configured in the parallel mode.
• In the parallel mode, at the ideal
setting, the I/OPT LED should
flash on musical peaks to indicate
that the amplifier is producing max-
imum current.
flash on musical peaks to indicate
that the amplifier is producing max-
imum current.
If either the I/OPT or E/OPT LED is
on steadily, the amplifier is being
overdriven and your speakers may
be in jeopardy. Turn the LEVEL
control back slightly until the I/OPT or
E/OPT LED flashes on musical peaks.
on steadily, the amplifier is being
overdriven and your speakers may
be in jeopardy. Turn the LEVEL
control back slightly until the I/OPT or
E/OPT LED flashes on musical peaks.
SETTING PHASE
1. Initially set the PHASE control to 0°.
Play a favorite audio track that has
significant bass output.
significant bass output.
2. Continue listening to the music and
have another person slowly adjust
the PHASE control towards 180° and
back to 0° again.
the PHASE control towards 180° and
back to 0° again.
3. Repeat Step 2 as needed until you
find a setting that produces the most
mid-bass output.
mid-bass output.
NOTE: For applications using multiple
GTi amplifiers where the highest SPL
is desired at a single point in the
vehicle (i.e., SPL competition), adjust
the PHASE controls on all amplifiers
so all speakers are in phase at the
microphone position. This will pro-
vide the highest SPL when measured
with an SPL meter.
GTi amplifiers where the highest SPL
is desired at a single point in the
vehicle (i.e., SPL competition), adjust
the PHASE controls on all amplifiers
so all speakers are in phase at the
microphone position. This will pro-
vide the highest SPL when measured
with an SPL meter.
SETTING DBO
DBO (or Dynamic Bass Optimizer) is
a 12dB/octave high-pass filter with vari-
able frequency (20Hz to 80Hz)
and variable boost (0 to +12dB) at
the cutoff frequency.
a 12dB/octave high-pass filter with vari-
able frequency (20Hz to 80Hz)
and variable boost (0 to +12dB) at
the cutoff frequency.
NOTE: During DBO adjustment, you can
audition the effect by setting the DBO
switch to OFF and then back to ON.
audition the effect by setting the DBO
switch to OFF and then back to ON.
NOTE: The A3000GTi can be used
to drive a pair of stereo mid-bass
speakers. In this case, use the DBO
to set the high-pass filter (from 20Hz to
80Hz) and use the crossover to set the
low-pass filter (from 80Hz to 320Hz).
to drive a pair of stereo mid-bass
speakers. In this case, use the DBO
to set the high-pass filter (from 20Hz to
80Hz) and use the crossover to set the
low-pass filter (from 80Hz to 320Hz).
For a vented box where a subwoofer
is prone to overexcursion below the
tuned frequency, set DBO to ON and set
the DBO HP FREQ control 10Hz below
the box’s resonant (tuned)
frequency (e.g., 30Hz for a vented
box tuned to 40Hz). Power typically
wasted in this region will now be
conserved and instead be available
for frequencies the enclosure can
reproduce. Use the DBO BOOST
control to boost the bass at the set
frequency by as much as 12dB, as
shown in Figure 13.
is prone to overexcursion below the
tuned frequency, set DBO to ON and set
the DBO HP FREQ control 10Hz below
the box’s resonant (tuned)
frequency (e.g., 30Hz for a vented
box tuned to 40Hz). Power typically
wasted in this region will now be
conserved and instead be available
for frequencies the enclosure can
reproduce. Use the DBO BOOST
control to boost the bass at the set
frequency by as much as 12dB, as
shown in Figure 13.
For a sealed enclosure, use DBO to
enhance the middle of the bass region.
Set DBO to ON, and then set the DBO
HP FREQ control to 35Hz to 40Hz. Adjust
the DBO BOOST control for a big and
full bass sound. Alternatively, for a
tighter-sounding bass, set the DBO HP
FREQ control between 45Hz to 50Hz and
also adjust the DBO BOOST control
according to your preference.
enhance the middle of the bass region.
Set DBO to ON, and then set the DBO
HP FREQ control to 35Hz to 40Hz. Adjust
the DBO BOOST control for a big and
full bass sound. Alternatively, for a
tighter-sounding bass, set the DBO HP
FREQ control between 45Hz to 50Hz and
also adjust the DBO BOOST control
according to your preference.
For an infinite baffle application,
set DBO to ON, and then set the
HP FREQ control to the speaker’s Fs
value (to keep the subwoofer from
trying to create bass below the
resonant frequency). Adjust the DBO
BOOST control according to your taste.
set DBO to ON, and then set the
HP FREQ control to the speaker’s Fs
value (to keep the subwoofer from
trying to create bass below the
resonant frequency). Adjust the DBO
BOOST control according to your taste.
–9
–6
–3
0
–12
20
80
Freq. (Hz)
dB
DBO HP FREQ Control
(adjusts cut-off
frequency)
–6
0
6
12
–12
20
80
Freq. (Hz)
dB
DBO BOOST Control
(adjusts boost amount
at cut-off frequency)
HP FREQ
20Hz
80Hz
BOOST
MAX
MIN
Figure 13. Frequency response curves
show typical DBO control ranges for
the JBL A6000GTi or A3000GTi amplifier.
show typical DBO control ranges for
the JBL A6000GTi or A3000GTi amplifier.
SETTING THE CROSSOVER
IMPORTANT: If you plan to use the
A3000GTi to drive full-range speakers,
set the crossover mode switch to FLAT
and skip to the next section, “Setting
Input Sensitivity.”
A3000GTi to drive full-range speakers,
set the crossover mode switch to FLAT
and skip to the next section, “Setting
Input Sensitivity.”
1. Depending on your system plan,
set the A3000GTi’s crossover mode
switch to LP (low-pass) or HP (high-
pass). The A6000GTi is a low-pass
amplifier only, designed to drive
subwoofers. No crossover switch
is provided.
switch to LP (low-pass) or HP (high-
pass). The A6000GTi is a low-pass
amplifier only, designed to drive
subwoofers. No crossover switch
is provided.
2. The crossover slope has two
settings: 12 (dB per octave) or
24 (dB per octave). Select the
slope that best suits your taste, but
consider that a steeper low-pass
filter will make the subwoofers
sound less directional (since more
midrange will be filtered from the
signal). A steeper high-pass filter will
reduce a small speaker’s
unnecessary cone excursion at
the lowest frequencies, which
will increase power handling
and reduce distortion.
24 (dB per octave). Select the
slope that best suits your taste, but
consider that a steeper low-pass
filter will make the subwoofers
sound less directional (since more
midrange will be filtered from the
signal). A steeper high-pass filter will
reduce a small speaker’s
unnecessary cone excursion at
the lowest frequencies, which
will increase power handling
and reduce distortion.
3. Set the A3000GTi’s HP FREQ control
to allow the speakers to make
as much bass as possible while
minimizing distortion caused by
small speakers trying to reproduce
the lowest frequencies. The best
setting is one where the speakers
produce crisp, clear impact without
being overdriven.
as much bass as possible while
minimizing distortion caused by
small speakers trying to reproduce
the lowest frequencies. The best
setting is one where the speakers
produce crisp, clear impact without
being overdriven.
4. For either amplifier, set the LP FREQ
control so vocal information is not
reproduced by the subwoofers, and
the subwoofers’ sound blends with
the sound of the midrange speakers
without any missing information.
reproduced by the subwoofers, and
the subwoofers’ sound blends with
the sound of the midrange speakers
without any missing information.
NOTE: The LP FREQ control can be
set to any frequency between 32Hz
and 320Hz.
Click on the first or last page to see other A6000GTI (serv.man5) service manuals if exist.