JL Audio XD600-6 User Manual
OWNER’S MANUAL
600W 3/4/5/6 Channel Amplier
Thank you for purchasing a JL Audio amplifier for
your automotive sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment in your vehicle.
For maximum performance, we highly recommend that you have
your new amplifier installed by an authorized JL Audio dealer. Your
authorized dealer has the training, expertise and installation equipment
to ensure optimum performance from this product. Should you
decide to install the amplifier yourself, please take the time
to read this manual thoroughly so as to familiarize yourself
with its installation requirements and setup procedures.
If you have any questions regarding the instructions in this
manual or any aspect of your amplifier’s operation, please contact your
authorized JL Audio dealer for assistance. If you need further assistance,
please call the JL Audio Technical Support Department
at (954) 443-1100 during business hours.
PROTECT YOUR HEARING!
Status
LED
(pg. 11)
Ch. 1 & 2 Filter
Frequency
Selector
(pg. 8)
Ch. 1 & 2
Filter Mode
Selection
(pg. 8)
Ch. 1 & 2 Input
Sensitivit y Control
(pg. 7)
Remote
Level Mode
Switch
(pg. 9)
Input
Mode
Switch
(pg. 7)
Ch. 3 & 4 Filter
Frequency
Selector
(pg. 8)
Ch. 3 & 4
Filter Mode
Selection
(pg. 8)
Ch. 3 & 4 Input
Sensitivit y Control
(pg. 7)
Ch. 5 & 6 Filter
Frequency
Selector
(pg. 8)
Ch. 5 & 6
Filter Mode
Selection
(pg. 8)
Ch. 5 & 6 Input
Sensitivit y Control
(pg. 7)
We value you as a long-term customer. For
that reason, we urge you to practice restraint in
the operation of this product so as not to damage
your hearing and that of others in your vehicle.
Studies have shown that continuous exposure to
high sound pressure levels can lead to permanent
(irreparable) hearing loss. This and all other
high-power amplifiers are capable of producing
such high sound pressure levels when connected
to a speaker system. Please limit your continuous
exposure to high volume levels.
While driving, operate your audio system in
a manner that still allows you to hear necessary
noises to operate your vehicle safely (horns,
sirens, etc.).
SERIAL NUMBER
In the event that your amplifier requires
service or is ever stolen, you will need to have
a record of the product’s serial number. Please
take the time to enter that number in the space
provided below. The serial number can be found
on the bottom panel of the amplifier and on the
amplifier packaging.
Serial Number:
INSTALLATION APPLICATIONS
This amplifier is designed for operation in
vehicles with 12 volt, negative-ground electrical
systems. Use of this product in vehicles with
positive ground and/or voltages other than 12V
may result in damage to the product and will void
th e w ar ran ty.
This product is not certified or approved for
use in aircraft.
Do not attempt to “bridge” the outputs of this
amplifier with the outputs of a second amplifier,
including an identical one.
2 | JL Audio - XD600/6 Owner’s Manual
PLANNING YOUR INSTALLATION
Remote Turn-On
Connector
(pg. 6)
Chassis Ground
Connector
(pg. 5)
Channels 1 & 2
Preamp Input Jacks
(pg. 7)
Channels 5 & 6
Preamp Input Jacks
(pg. 7)
+12 V Power
Connector
(pg. 5)
Channels 5 & 6
Speaker Outputs
(pg. 10)
Channels 3 & 4
Speaker Outputs
(pg. 10)
Channels 1 & 2
Speaker Outputs
(pg. 10)
Jack for
Remote Level
Control Knob
(pg. 9)
Channels 3 & 4
Preamp Input Jacks
(pg. 7)
It is important that you take the time to read
this manual and that you plan out your
installation carefully. The following are some
considerations that you must take into account
when planning your installation.
Cooling Efficiency Considerations:
The outer shell of your JL Audio amplifier
is designed to remove heat from the amplifier
circuitry. For optimum cooling performance,
this outer shell should be exposed to as large a
volume of air as possible. Enclosing the amplifier
in a small, poorly ventilated chamber can
lead to excessive heat build-up and degraded
performance. If an installation calls for an
enclosure around the amplifier, we recommend
that this enclosure be ventilated with the aid
of a fan. In normal applications, fan-cooling
is not necessary.
Mounting the amplifier upside down is
strongly discouraged.
If mounting the amplifier under a seat,
make sure there is at least 1 inch (2.5 cm) of
space above the amplifier’s outer shell to permit
proper cooling.
Safety Considerations:
Your amplifier needs to be installed in a dry,
well-ventilated environment and in a manner
which does not interfere with your vehicle’s safety
equipment (air bags, seat belt systems, ABS brake
systems, etc.). You should also take the time to
securely mount the amplifier so that it does not
come loose in the event of a collision or a sudden
jolt to the vehicle.
Stupid Mistakes to Avoid
• Check before drilling any holes in your vehicle
to make sure that you will not be drilling
through a gas tank, brake line, wiring harness or
other vital vehicle system.
• Do not run system wiring outside or underneath
the vehicle. This is an extremely dangerous
practice which can result in severe damage to
your vehicle and person.
• Protect all system wires from sharp metal
edges and wear by carefully routing them,
tying them down and using grommets and
loom where appropriate.
• Do not mount the amplifier in the engine
compartment, under the vehicle, on the roof
or in any other area that will expose the
amplifier circuitry to the elements.
ENGLISH
3
PRODUCT DESCRIPTION
The JL Audio XD600/6 is a six-channel,
full-range audio amplifier utilizing JL Audio
NexD™ ultra-high speed switching technology to
deliver outstanding fidelity and efficiency.
The XD600/6 can be operated with a wide
variety of source units and system configurations.
TYPICAL INSTALLATION SEQUENCE
The following represents the sequence
for a typical amplifier installation, using an
aftermarket source unit or OEM Interface
processor (like the CleanSweep CL441dsp).
Additional steps and different procedures may
be required in some applications. If you have
any questions, please contact your authorized
JL Audio dealer for assistance.
1) Disconnect the negative battery post
connection and secure the disconnected cable
to prevent accidental re-connection during
installation. This step is not optional.
2) Run 4 AWG power wire from the battery
location to the amplifier mounting location,
taking care to route it in such a way that it
will not be damaged and will not interfere
with vehicle operation. Use 4 AWG or larger
power wire and a power distribution block if
additional amplifiers are being installed with
the XD600/6 .
3) Connect power wire to the positive battery
post. Fuse the wire with an appropriate fuse
block (and connectors) within 18 inches (45
cm) wire length of the positive battery post.
This fuse is essential to protect the vehicle.
Do not install the fuse until the power wire
has been securely connected to the amplifier.
4) Run signal cables and remote turn-on wire
from the source unit to the final amplifier
mounting location.
5) Run speaker cables from the speaker systems
to the amplifier mounting location.
6) Find a good, solid metal grounding point
close to the amplifier and connect the
negative power wire to it using appropriate
hardware (use of the JL Audio ECS master
ground lug, XB-MGLU is recommended).
Use 4 AWG wire, no longer than 36 inches
(90 cm) from the amplifier to the ground
connection point. In some vehicles, it may be
necessary to upgrade the battery ground wire.
(See page 5 for important notice).
7) Securely mount the amplifier.
8) Connect the positive and negative power
wires to the amplifier. A fuse near
the amplifier is not necessary if the
XD600/6 is the only device being run
from the fused main power wire. If
the fused main power wire is shared
by the XD600/6 and other amplifiers
or devices, fuse each amplifier/device
within 12 inches (30 cm) of wire length,
via a fused distribution block or multiple
individual fuse blocks/on-board fuses.
9) Connect the remote turn-on wire
to the amplifier.
10) Connect the input cables to the amplifier.
11) Connect the speaker cables to the amplifier.
12) Carefully review the amplifier’s control
settings to make sure that they are set
according to the needs of the system.
13) Install the power wire fuse (50A for a
single XD600/6) and reconnect the negative
battery post terminal. Install the fuse (50A)
near the amplifier (if applicable).
14) Turn on the source unit at a low level
to double-check that the amplifier is
configured correctly. Resist the temptation
to crank it up until you have verified the
control settings.
15) Make necessary adjustments to the input
sensitivity controls to obtain the right
overall output and the desired balance
in the system. See Appendix A (page 14)
for the recommended input sensitivity
setting method.
16) Enjoy the fruits of your labor with your
favorite music.
4 | JL Audio - XD600/6 Owner’s Manual
POWER CONNECTIONS
Before installing the amplifier, disconnect the
negative (ground) wire from the vehicle’s battery.
This will prevent accidental damage to the system,
the vehicle and your body during installation.
The XD600/6’s “+12 V DC ” and “Ground”
connections are designed to accept 4 AWG
power wire. 4 AWG is the required wire size for
this amplifier.
If you are installing the XD600/6 with other
amplifiers and wish to use a single main power
wire, use 2 AWG or 1/0 AWG main power wire
(depending on the overall current demands of all
the amplifiers in the system). This 2 AWG or
1/0 AWG power wire should terminate into a
fused distribution block mounted as close to
the amplifiers as possible (within 12 inches /
30cm of wire length). The fused output of the
distribution block will connect to the XD600/6
with 4 AWG power wire. JL Audio ECS
fused distribution blocks are recommended
(XD-FDBU-2 and XD-FDBU-4)
Note: Smaller AWG numbers mean bigger
wire and vice-versa (1/0 AWG is the largest, 2
AWG is smaller, then 4 AWG, then 8 AWG, etc.).
To connect the power wires to the amplifier,
first back out the set screw on the top of the
terminal block, using the supplied 2.5 mm hex
wrench. Strip 1/2 inch (12 mm) of insulation from
the end of each wire and insert the bare wire into
the terminal block, seating it firmly so that no
bare wire is exposed. While holding the wire in
place, tighten the set screw firmly, taking care not
to strip the head of the screw.
The ground connection should be made
using 4 AWG wire and should be kept as
short as possible, while accessing a solid
piece of sheet metal in the vehicle. The
surface of the sheet metal should be sanded
at the contact point to create a clean, metalto-metal connection between the chassis
and the termination of the ground wire.
For optimal grounding, we recommend the
use of a JL Audio ECS master ground lug
(XB-MGLU). Alternatively, a sheet metal
screw or bolt can be used with a star washer.
Any wires run through metal barriers (such
as firewalls), must be protected with a high
quality rubber grommet to prevent damage to the
insulation of the wire. Failure to do so may result
in a dangerous short circuit.
Many vehicles employ small (10 AWG -
6 AWG) wire to ground the battery to the
vehicle chassis and to connect the alternator's
positive connection to the battery. To prevent
voltage drops, these wires should be upgraded
to 4 AWG when installing amplifier systems
with main fuse ratings above 60A.
FUSE REQUIREMENTS
It is absolutely vital that the main power
wire(s) to the amplifier(s) in the system be
fused within 18 inches (45 cm) of the positive
battery post connection. The fuse value at each
power wire should be high enough for all of the
equipment being run from that power wire. If
only the XD600/6 is being run from that power
wire, we recommend a 50A fuse be used.
If fusing the amplifier near its power
connections (when more than one amp is being
run from the main power wire), use a 50A fuse.
MAXI™ (big plastic-body) fuses
are recommended.
ENGLISH
5
TURNON LEAD
The XD600/6 uses a conventional +12V remote
turn-on lead, typically controlled by the source
unit's remote turn-on output. The amplifier will
turn on when +12V is present at its “Remote”
input and turn off when +12V is switched off. If
a source unit does not have a dedicated remote
turn-on output, the amplifier’s turn-on lead can
be connected to +12V via a switch that derives
power from an ignition-switched circuit.
The XD600/6’s “Remote” turn-on connector
is designed to accept 18 AWG – 12 AWG wire. To
connect the remote turn-on wire to the amplifier,
first back out the set screw on the top of the
terminal block, using the supplied 2.5mm hex
wrench. Strip 1/2 inch (12mm) of wire and insert
the bare wire into the terminal block, seating it
firmly so that no bare wire is exposed. While
holding the wire in the terminal, tighten the set
screw firmly, taking care not to strip the head of
the screw and making sure that the wire (not the
insulation) is firmly gripped by the set screw.
6 | JL Audio - XD600/6 Owner’s Manual
INPUT SECTION
The XD600/6’s input section allows you to send
signals to the amplifier section through the use
of two, four or six differential-balanced inputs.
Input connections are via up to three pairs of
traditional RCA-type jacks.
If you wish to send six discrete channels into
the XD600/6, simply use all six inputs and set the
“Input Mode” switch in the “6 Ch.” position.
If you wish to feed all six channels by using
only four channels of full-range input, set the
“Input Mode” switch in the to “4 Ch.” and use
only the inputs to channels 1, 2, 3 & 4. In this
mode, channels 5 & 6 will operate with a sum of
the 1 & 3 and 2 & 4 input signals, respectively.
If you wish to feed all six channels by using
two channels of full-range input plus two
channels of low-frequency input (subwoofer
output from the source unit), first set the “Input
Mode” switch to “6 Ch.”. Next, it will be necessary
to split the full-range signals with y-adaptors and
feed these signals into the inputs to channels 1 &
2 and 3 & 4. The dedicated subwoofer signal will
be sent to channels 5 & 6.
If you wish to use only two channels of
input to deliver signal to all six amplifier
channels, set the “Input Mode” switch to “2
Ch.” and use only the inputs to channels 1 &
2. In this mode, Channels 3 & 5 will operate
with the channel 1 signal and channels 4 &
6 will operate with the Channel 2 signal.
Input Voltage Range:
The XD600/6’s input sections are designed to
accept signal voltages from 100mV – 4V. This
will accommodate all preamp level signals and
many speaker level signals.
To use speaker-level sources, simply splice the
speaker output wires of the source unit onto a
pair of RCA plugs for each input pair. (or use JL
Audio part XD-CLRAIC2-SW) No “line output
converter” is needed in most cases.
If you find that the output cannot be reduced
sufficiently with a direct speaker level signal
applied to the amplifier, you may use a “line
output converter” to reduce the signal level.
INPUT SENSITIVITY CONTROLS
The controls labeled “Input Sens.” located in
each channel section can be used to match the
source unit’s output voltage to the input stage of
each pair of amplifier channels for maximum
clean output. Rotating the control clockwise will
result in higher sensitivity (louder for a given
input voltage). Rotating the control counterclockwise will result in lower sensitivity (quieter
for a given input voltage.)
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
14) in this manual. After using this procedure,
you can then adjust any or all “Input Sens.”
levels downward if this is required to achieve the
desired system balance.
Do not increase any “Input Sens.” setting for
any channel(s) of any amplifier in the system
beyond the maximum level established during
the procedure outlined in Appendix A (page 14).
Doing so will result in audible distortion and
possible speaker damage.
ENGLISH
7
FILTER CONTROLS
Most speakers are not designed to reproduce
the full range of frequencies audible by the human
ear. For this reason, most speaker systems are
comprised of multiple speakers, each dedicated
to reproducing a specific frequency range. Filters
are used to select which frequency range is sent
to each section of a speaker system. The division
of frequency ranges to different speakers can be
done with passive filters (coils and/or capacitors
between the amplifier outputs and the speakers),
which are acceptable and commonly used
for filtering between mid-range speakers and
tweeters. Filtering between subwoofer systems
and satellite speaker systems is best done with
active filters, which cut off frequency content at
the input to the amplifier. Active filters are more
stable than passive filters and do not introduce
extraneous resistance, which can degrade
subwoofer performance.
The active filter built into each channel
section of the XD600/6 can be used to eliminate
potentially harmful and/or undesired frequencies
from making their way through the amplifier
sections to the speaker(s). This serves to improve
tonal balance and to avoid distortion and possible
speaker failure. Correct use of these filters can
substantially increase the longevity and fidelity of
your audio system.
1) “Filter Mode” Control: The XD600/6 employs
a 12dB per octave filter for each pair of
channels (one filter for channels 1&2, another
filter for channels 3&4 and a third filter for
channels 5&6). Each of these filters can be
configured independently into one of two filter
types or defeated completely by way of the
three-position “Filter Mode” switches:
“O ff ”: Defeats the filter completely, allowing
the full range of frequencies present at the
inputs to feed the amplifier. This is useful for
systems utilizing outboard active crossovers or
requiring full-range reproduction from one or
more of the XD600/6’s channel pairs.
“LP” (Low -Pass): Configures the filter to
attenuate frequencies above the selected filter
frequency at a rate of 12dB per octave. This is
useful for connection of subwoofer(s) to one
or more of the XD600/6’s channel pairs in a
bi-amplified system.
“HP” (High-Pass): Configures the filter to
attenuate frequencies below the selected filter
frequency at a rate of 12dB per octave. This is
useful for connection of component speakers to
one or more of the XD600/6’s channel pairs in
a bi-amplified system.
2) “Filter Freq. (Hz)” The filter frequency
markings surrounding this rotary control
are for reference purposes and are generally
accurate to within 1/3 octave or better. If you
would like to select the filter cutoff frequency
with a higher level of precision, consult the
chart in Appendix B (page 15).
Tuning Hint: If you are using the XD600/6
to drive a subwoofer system (“LP” mode), a
component satellite speaker system (“HP” mode)
or both, 80 Hz is a good baseline “Filter Freq.
(H z)” setting. After properly adjusting the “Input
Sens.”, as outlined in Appendix A (page 14), you
can fine tune the “Filter Freq. (Hz)” control to
achieve the desired system frequency response.
8 | JL Audio - XD600/6 Owner’s Manual
REMOTE LEVEL CONTROL OPTIONAL
With the addition of the optional Remote
Level Control (HD-RLC), you can control the
volume of one, two or all three channel pairs of
the XD600/6 from the front of the vehicle. This
is useful for subwoofer level control, rear channel
level control, center-channel level control or even
as a master volume control for the system.
The HD-RLC connects to the jack labeled
“Remote Level Control” on the Connection Panel
of the amplifier using a standard telephone cable
(supplied with the HD-RLC). If desired, multiple
XD (and HD) amplifiers can be controlled from
a single HD-RLC controller using a simple phone
line “splitter” and multiple phone cables.
When connected to the amplifier, the
HD-RLC operates as follows. At full counterclockwise rotation, the audio will mute
completely. At full clockwise rotation the level
will be the same as if the HD-RLC was not
connected at all. In other words, it operates
strictly as a level attenuator.
ENGLISH
“Remote Level Mode” Switch: This switch
allows you to assign the operation of the
HD-RLC to one, two or all three pairs of
channels. In the “A l l” position, the HD-RLC
knob will affect all three channel pairs equally.
In the “3-6” (middle) position, only the level
of channels 3, 4, 5 and 6 will be affected by the
HD-RLC knob (channels 1 & 2 will not).
In the “5&6” position, only the level of
channels 5 and 6 will be affected by the HD-RLC
knob (channels 1, 2, 3 and 4 will not).
9
SPEAKER OUTPUTS
The XD600/6’s speaker outputs are designed
to accept 16 AWG - 8 AWG wire. To connect the
speaker wires to the amplifier, first back out the
set screws on the top of the terminal block, using
the supplied 2.5 mm hex wrench. Strip 1/2 inch
(12 mm) of insulation from the end of each wire
and insert the bare wire into the terminal block,
seating it firmly so that no bare wire is exposed.
While holding the wire in place, tighten the set
screw firmly, taking care not to strip the head of
the screw.
Each pair of the XD600/6’s channels are
designed to deliver power into speaker loads equal
to or greater than 2 ohms when using a “stereo”
configuration and speaker loads equal to or greater
than 4 ohms when using a “bridged” conf iguration.
Speaker loads below 2 ohms nominal
per channel (or 4 ohms bridged) are
not recommended and may cause the
amplifier to initiate a protection mode
which reduces power output.
BRIDGING CONSIDERATIONS
Bridging is the practice of combining the
output of two amplifier channels to drive a single
load. When bridged, each channel produces
signals of equal magnitude, but opposite polarity.
The combined output of the two channels
provides twice the output voltage available from
a single channel. The XD600/6 has been designed
for bridging of its channel pairs without the need
for input inversion adaptors.
To bridge a pair of channels, use the “Left +”
and “Right –” speaker connectors only (the
“Left –” and “Right +” remain unused). When
bridged, each channel will deliver optimum
power into a 4 ohm load.
When a pair of channels are bridged, they
will deliver 200W x 1 into a 4 ohm load or
150W x 1 into an 8 ohm load. Operating a
pair of bridged channels into a load lower
than 4 ohms is not recommended.
Because a bridged pair of channels requires
that both channels receive input, you need to
connect both left and right inputs to the source
unit. Connection of only one input will result in
reduced power output, increased distortion and
can cause the amplifier to overheat.
Do not do this!
When a pair of the XD600/6’s channels are
operating in bridged mode, the output will be in
mono (only one channel). This mono channel
can contain right channel only information,
left channel only information or the sum of
the information from both the right and left
channels. In order to achieve one of these options,
configure the inputs to that pair of channels in
one of these two ways:
1) Left Channel Only or Right Channel Only
Information: If you wish to send a left-only
or right-only signal to a pair of the XD600/6’s
channels, use a “Y-Adaptor” to split the single
channel signal into both left and right RCA
inputs. This option is useful when using a
pair of the XD600/6’s channels to drive left
channel speakers only and the other pair of
the XD600/6’s channels to drive right channel
speakers only.
2) Left + Right Channel Information: When
bridged and fed by a stereo input, a pair of the
XD600/6’s channels will automatically combine
the left and right channels into a summed
mono (left + right) channel. This option is
useful when using a pair of the XD600/6’s
channels to drive a subwoofer system or a
summed mono center channel.
10 | JL Audio - XD600/6 Owner’s Manual
STATUS LED / PROTECTION CIRCUITRY
There is a single multi-color LED on the top
surface of the amplifier to indicate the amplifier’s
operating status.
1 ) F l a s h i n g G r e e n : amplifier is powering up,
audio output is muted.
over-current condition is of a very short duration.
This functionality can be used to diagnose a
short-circuit by only connecting one channel at
a time. The “Status LED” will turn amber when
you connect the channel that is experiencing the
problem and turn the volume up.
5) LED off / Amplifier Shuts Off Unexpectedly
The only condition that will shut down
an undamaged XD600/6 completely is if battery
voltage or remote turn-on voltage drops below
10 volts. The “Status LED” will turn off when
this occurs. The amplifier will turn back on
when voltage climbs back above 11 volts. If this
is happening in your system, have your charging
system and power wiring inspected.
ENGLISH
2) Constant Green: amplifier is on and
functioning normally, audio output is active.
3) Constant Red: Indicates that the
amplifier has exceeded its safe operating
temperature, putting the amplifier into a
self-protection mode, which reduces the
peak power output of the amplifier. When its
temperature returns to a safe level, the red
light will return to green and the amplifier will
return to full-power operating mode.
4) Constant Amber (yellow): Indicates
that an over-current condition has occurred
and is accompanied by a muting of the affected
channel(s). Because the muting behavior may be
very short in duration, it may manifest itself as
an audible, repetitive ticking noise in the output.
Over-current conditions can be caused by a
speaker impedance lower than the optimum load
impedance range for the amplifier or a shortcircuit in the speaker wiring. The latter can result
from a short circuit between the positive and
negative speaker wires or between either speaker
wire and the vehicle chassis. The “Status LED”
will remain amber for a few seconds, even if the
For more information on troubleshooting this
amplifier, refer to Appendix D (pages 16, 17).
SERVICING YOUR JL AUDIO AMPLIFIER
If your amplifier fails or malfunctions, please
return it to your authorized JL Audio dealer so
that it may be sent in to JL Audio for service.
There are no user serviceable parts or fuses inside
the amplifier. The unique nature of the circuitry
in the JL Audio amplifiers requires specifically
trained service personnel. Do not attempt
to service the amplifier yourself or through
unauthorized repair facilities. This will not only
void the warranty, but may result in the creation of
more problems within the amplifier.
If you have any questions about the installation or
setup of the amplifier not covered in this manual,
please contact your dealer or technical support.
JL Audio Technical Support:
(9 5 4 ) 4 4 3 -11 0 0
9:00 AM – 5:30 PM (Eastern Time Zone)
Monday - Friday
11
SYSTEM CONFIGURATIONS
The XD600/6 is a flexible amplifier, wellsuited for a multitude of system configurations.
In this section, the most likely configurations are
explained in detail.
Once you have selected your desired
configuration, you can use the amplifier panel
drawing on pages 18 & 19 to mark the required
switch positions for easy reference.
BIAMPLIFIED SYSTEMS
Bi-amplified systems are defined as systems
in which separate amplifier channels drive lowfrequency (LF) and high-frequency (HF) speakers
and are separately filtered to send appropriate
frequency ranges to each speaker system.
The most common application of
bi-amplification in mobile audio is to drive a
subwoofer system from one or more amplifiers or
channels and component speakers from separate
amplifiers or channels.
The XD600/6 is designed to work as the only
amplifier in a bi-amplified system.
Bi-Amplified System with the XD600/6
In this configuration, channels 5&6 of the
XD600/6 will drive subwoofers (stereo 75W x 2 at
4 ohms, 100W x 2 at 2 ohms, or bridged 200W x 1
at 4 ohms) with low-pass filtering. Channels 1&2
and channels 3&4 will drive component speakers
in stereo (75W x 4 at 4 ohms or 100W x 2 at 2
ohms) with high-pass filtering.
Input connection options for a bi-amplified system
with one XD600/6 are as follows:
A) No User Adjustability:
R e q u i r e d : a basic source unit or processor
with one pair of stereo outputs.
Inp ut Connections: a single pair of stereo source
unit outputs is connected to the “Ch 1” and “Ch
2” inputs of the XD600/6. Then, select “2 ch.”
on the XD600/6’s “Input Mode” switch.
R e s u l t : the relative level of the LF and HF
channels will be fixed by the XD600/6’s
“Input Sens.” settings and will not be user
adjustable from the front of the vehicle
(unless an optional HD-RLC is connected the
“Remote Level Control” port and used as a
subwoofer level control).
B) Fade Front vs. Rear with no Subwoofer
Level Control:
R e q u i r e d : a basic source unit or processor with
two pairs of stereo outputs.
Inp ut Connections: one pair of stereo source unit
outputs is connected to the “CH 1 (Left)” and
“CH 2 (Right)” inputs and the second pair
of stereo source unit outputs is connected
to the “CH 3 (Left)” and “CH 4 (Right)”
inputs of the XD600/6 (select “4 Ch.” on the
“Input Mode” switch in the “Channel 5 & 6
Controls” section).
R e s u l t : the relative level of the LF and HF
channels will be fixed by the XD600/6’s
“Input Sens.” settings and will not be user
adjustable from the front of the vehicle, but
the user will be able to fade the signal from
front to rear.
An optional HD-RLC can be connected the
“Remote Level Control” port and used as a
subwoofer level control, if desired.
C) Fade Subwoofer Level vs. HF Level:
R e q u i r e d : a basic source unit or processor with
two pairs of stereo outputs.
Inp ut Connections: the first stereo pair of source
unit outputs each split with a “Y-Adaptor”
allowing the left signal to be sent to the “CH
1 (Left)” and “CH 3 (Left)” inputs and the
right signal to be sent to the “CH 2 (Right)”
and “CH 4 (Right)” inputs of the XD600/6.
The second stereo pair of source unit outputs
is connected to the “CH 5 (Left)” and “CH 6
(Right)” inputs (select “6 Ch.” on the “Input
Mode” switch).
R e s u l t : in this mode, the user has the ability to
fade or control the level of the LF channels
relative to the HF channels via the source
unit’s fader control without exceeding the
maximum clean output level set by each
amplifier section’s “Input Sens.” controls.
12 | JL Audio - XD600/6 Owner’s Manual
Loading...