JL Audio Marine Instruments M600 1 User Manual

owner’s manual  
600W Marine Monoblock Subwoofer Amplifier  
Thank you for purchasing a JL Audio amplifier for  
your marine sound system.  
Your amplifier has been designed and manufactured to exacting  
standards in order to ensure years of musical enjoyment in your vessel.  
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.  
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ProteCt Your Hearing!  
installation aPPliCations  
Planning Your installation  
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 vessel.  
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.  
This amplifier is designed for operation in  
vessels with 12 volt, negative-ground electrical  
systems. Use of this product in vessels with  
positive ground and/or voltages other than 12V  
may result in damage to the product and will void  
the warranty.  
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.  
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.  
Mounting the amplifier upside down is  
strongly discouraged.  
safety Considerations:  
Your amplifier needs to be installed in a dry,  
well-ventilated environment and in a manner  
which does not interfere with your vessel’s factory  
installed electronic devices. You should also take  
the time to securely mount the amplifier using the  
supplied screws so that it does not come loose in  
the event of a collision or a sudden jolt to the vessel.  
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.  
While driving, operate your audio system in  
a manner that still allows you to hear necessary  
noises to operate your vessel safely (horns,  
sirens, etc.).  
stupid mistakes to avoid:  
• Check before drilling any holes in your vessel to  
make sure that you will not be drilling through  
the hull, a fuel tank, fuel line, wiring harness or  
other vital vessel system.  
• Do not run system wiring outside or underneath  
the vessel. This is an extremely dangerous  
practice which can result in severe damage to  
your vessel and person.  
• Protect all system wires from sharp edges  
(metal, fiberglass, etc.) by carefully routing  
them, tying them down and using grommets  
and loom where appropriate.  
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:  
• Do not mount the amplifier in the engine  
compartment or in any other area that will  
expose the amplifier circuitry to the elements.  
Infrasonic  
Filter  
Frequency  
Selector  
(pg. 8)  
LP Filter  
Mode/Slope  
Selection  
(pg. 8)  
While this amplifier is specially designed  
for marine applications, it is not waterproof  
and it should not be mounted where it is  
likely to get wet.  
Filter  
Selection  
(pg. 9)  
Status  
LED  
(pg. 11)  
Input Sensitivity  
Control  
(pg. 7)  
Chassis Ground  
Connector  
(pg. 5)  
Left & Right  
Preamp Input Jacks  
(pg. 7)  
Jack for  
+12 V Power  
Remote Turn-On  
Connector  
(pg. 6)  
Left & Right  
Preamp Output Jacks  
(pg. 10)  
Remote Level  
Control Knob  
(pg. 9)  
Mono  
Subwoofer Outputs  
(pg. 10)  
Connector  
(pg. 5)  
2 | JL Audio - M600/1 Owner’s Manual  
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ProduCt desCriPtion  
Power ConneCtions  
The M600/1 is a monoblock amplifier utilizing  
JL Audio NexD™ high speed switching technology  
to deliver outstanding fidelity and efficiency.  
The M600/1 can be operated with a wide  
variety of source units and system configurations.  
Its frequency response is limited to the range  
below 500 Hz. It is not designed for driving  
midrange speakers or tweeters. Every aspect of its  
operation has been optimized for low-frequency  
amplification. For detailed specifications, please  
refer to Appendix C (page 13).  
6) Run speaker cable from the subwoofer  
system(s) to the amplifier mounting  
location.  
Before installing the amplifier, disconnect the  
negative (ground) wire from the vessel’s battery.  
This will prevent accidental damage to the system,  
the vessel and your body during installation.  
The ground connection should be made using  
the same gauge wire as the power connection.  
Any wires run through barriers must  
be protected with a high quality rubber  
grommet to prevent damage to the  
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 M600/6 is the  
only device being run from the fused main  
power wire. If the fused main power wire is  
shared by the M600/6 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 M600/1) 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.  
insulation of the wire. Failure to do so  
may result in a dangerous short circuit.  
Many vessels employ small (10 AWG - 6 AWG)  
wire to connect the alternator’s positive  
connection to the battery. To prevent voltage  
drops, this wire should be upgraded to 4 AWG  
when installing amplifier systems with main  
fuse ratings above 60A.  
tYPiCal installation sequenCe  
The following represents the sequence  
for a typical amplifier installation, using  
an aftermarket source unit. 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.  
The M600/1’s +12 VDCand Ground”  
connections are designed to accept 4 AWG  
power wire. 4 AWG is the required wire size for  
this amplifier.  
It is common for the alternator to be grounded  
through its chassis. If the alternator is not  
grounded through its chassis and instead employs  
a small (10 AWG - 6 AWG) wire to connect to  
ground, this wire should also be upgraded to 4  
AWG when installing amplifier systems with main  
fuse ratings above 60A.  
If you are installing the M600/1 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 M600/1  
with 4 AWG power wire. JL Audio ECS  
fused distribution blocks are recommended  
(XD-FDBU-2 and XD-FDBU-4)  
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 vessel operation. Use 4 AWG or larger  
power wire and a power distribution block if  
additional amplifiers are being installed with  
the M600/1.  
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 vessel. Do  
not install the fuse until the power wire has  
been securely connected to the amplifier.  
4) Connect negative power wire to the negative  
battery post. Use the same size power  
wire as the wire connected to the “+12V”  
connection (minimum 4 AWG).  
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 M600/1 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  
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.).  
16) Enjoy the fruits of your labor with your  
favorite music.  
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.  
are recommended.  
5) Run signal cables and remote turn-on wire  
from the source unit to the amplifier  
mounting location.  
4 | JL Audio - M600/1 Owner’s Manual  
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turn-on lead  
inPut seCtion  
inPut sensitiVitY Controls  
The M600/1 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 M600/1’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 2.5 mm 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 is firmly  
gripped by the set screw.  
The M600/1’s input section allows you to send  
signal to the amplifier section through the use  
of two differential-balanced inputs, one for the  
left channel signal and one for the right channel  
signal. Connection is via RCA-type jacks.  
The control labeled “Input Sens.” can be  
used to match the source unit’s output voltage to  
the input stage the M600/1 for maximum clean  
output. Rotating the control clockwise will result  
in higher sensitivity (louder for a given input  
voltage). Rotating the control counter-clockwise  
will result in lower sensitivity (quieter for a given  
input voltage.)  
You may run a stereo or a mono signal into  
the inputs of the amplifier. The amplifier’s input  
section automatically sums stereo signals to mono  
for the internal amplifier section. The amplifier  
will operate with only one input connection (left  
or right), but will require an increase in input  
sensitivity to overcome the loss of signal. If a  
mono input signal is to be run, we recommend  
that you use a “Y-adaptor” to split the mono  
signal into both inputs of the amplifier.  
To properly set the amplifier for maximum  
clean output, please refer to Appendix A (page  
12) in this manual. After using this procedure,  
you can then adjust the “Input Sens.” levels  
downward if this is required to achieve the  
desired system balance.  
input Voltage range:  
The M600/1’s input section is designed to  
accept signal voltages from 100mV – 4V. This  
will accommodate all preamp level signals and  
many speaker level signals.  
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 12).  
Doing so will result in audible distortion and  
possible speaker damage.  
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” or voltage divider to reduce the  
signal level.  
6 | JL Audio - M600/1 Owner’s Manual  
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Filter Controls  
inFrasoniC Filter  
remote leVel Control (oPtional)  
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 low-pass filter built into the M600/1  
is designed to attenuate frequencies above its  
filter frequency, so that the system’s subwoofers  
do not reproduce any audible midrange content.  
This serves to improve tonal balance  
and to avoid distortion. Correct use  
of the filter can substantially improve  
the fidelity of your audio system.  
3) Precise Frequency Selection: The filter  
frequency markings on the front panel of  
the amplifier are for reference purposes and  
are generally accurate to within 1/3 octave  
or better. If you would like to select the filter  
frequency with a higher level of precision,  
consult Appendix B (page 13) of this manual.  
This chart gives you a more accurate frequency  
for each of the forty detented positions of the  
frequency selection control. This method can  
be very useful if the amplifier is mounted in  
a location where you can’t see the front panel  
markings easily.  
The “Infrasonic Filter” is a 24 dB/octave high-  
pass filter, with a fixed cutoff frequency of 30 Hz.  
This filter is designed to conserve amplifier power  
and protect subwoofer systems, without audibly  
degrading the sub-bass output.  
With the addition of the optional Remote  
Level Control (HD-RLC), you can control the  
subwoofer volume from a location of your  
choosing.  
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 counter-  
clockwise 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.  
4) Defeating the LP Filter: The Low-Pass filter  
can also be defeated completely, by switching  
the “LP Filter Mode/Slope” switch to the  
Off” position. This is useful if you are using  
an external active crossover in the system.  
With the internal crossover turned off, the  
M600/1’s upper frequency response limit is 500  
Hz, due to its subwoofer-specific design.  
With ported enclosures and infinite baffle  
subwoofer systems, the use of the “Infrasonic  
Filter” is highly recommended to protect the  
speaker(s) from excessive excursion at inaudibly  
low frequencies.  
With sealed enclosures, the use of the filter  
is less necessary, but can still help protect the  
speaker system from excessive excursion.  
The “Infrasonic Filter” can be completely  
defeated by selecting the “Off” position on its  
switch. This bypasses all signal from flowing  
through the circuit.  
2) LP Filter Operation: The low-pass filter in the  
M600/1 is fully variable between 50 Hz and  
500 Hz via the “Filter Freq.” control knob and  
features the ability to select between a moderate  
12dB” per octave or a steep “24dB” per octave  
slope via the “LP Filter Mode/Slope” switch.  
Depending on the subwoofer system and  
the vessel, different slopes may be required to  
produce a smooth transition to the mid-bass  
speakers in the system. Experiment to find  
the slope which best matches the acoustic  
requirements of your system.  
8 | JL Audio - M600/1 Owner’s Manual  
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Preouts  
The M600/1 incorporates a pass-through  
preamp output section, so that additional  
amplifiers can be easily added to the system.  
The preamp output delivers the same signal that  
is connected to the M600/1’s inputs.  
subwooFer outPuts  
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.  
The M600/1 is designed to deliver power into  
subwoofer loads equal to or greater than 2 ohms.  
The M600/1’s subwoofer outputs are designed  
to accept 16 AWG - 8 AWG wire. To connect  
the subwoofer 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.  
5) LED off / Amplifier Shuts Off Unexpectedly  
The only condition that will shut down  
an undamaged M600/6 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.  
For more information on troubleshooting this  
amplifier, refer to Appendix D (pages 16, 17).  
1 ) F l a s h i n g G r e e n : amplifier is powering up,  
audio output is muted.  
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.  
2) Constant Green: amplifier is on and  
functioning normally, audio output is active.  
The preamp output signal by any crossover  
filter selected (if the input signal is full-range, the  
preamp output will be full-range).  
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.  
If you plan to use the “Preouts” to feed  
a stereo amplifier, you must connect a  
stereo signal to the input of the amplifier.  
A mono signal into the amplifier will result  
in a mono signal out of the preamp output.  
You will notice that there are two “+” positive  
connections and two “” negative connections.  
This is to facilitate multiple subwoofer wiring.  
The two positive and two negative connections  
are connected in parallel inside the amplifier  
They are not stereo outputs. Connecting two  
subwoofers, each to one set of positive and  
negative terminals, will result in a parallel  
subwoofer connection. If only connecting one  
pair of subwoofer wires, it is not necessary to use  
both sets of connections.  
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.  
4) Constant Amber (yellow): Indicates  
that an over-current condition has occurred and  
is accompanied by a muting of the amplifier’s  
output. 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 short-  
circuit 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 a power wire. The “Status LED” will  
remain amber for a few seconds, even if the over-  
current condition is of a very short duration.  
Jl audio technical support:  
(954) 443-1100  
9:00 AM – 5:30 PM (Eastern Time Zone)  
Monday - Friday  
Subwoofer loads below 2 ohms nominal are not  
recommended and may cause the amplifier  
to initiate a protection mode which reduces  
power output.  
10 | JL Audio - M600/1 Owner’s Manual  
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aPPendix a:  
aPPendix b:  
aPPendix C:  
input sensitivity level setting  
Following the directions below will allow the  
installer to adjust the input sensitivity of each  
amplifier channel pair simply and easily in just a  
few minutes using equipment which is commonly  
available.  
8) Increase the Input Sens.control until the  
target voltage is observed with the voltmeter.  
9) Once you have adjusted the M600/1 to its  
maximum low-distortion output level,  
reconnect the speaker(s). The Input Sens.”  
controls can now be adjusted downward if the  
amplifier requires attenuation to achieve the  
desired system balance.  
Precise Frequency selection Chart  
m600/1 specifications  
“Filter Freq” amP Filter  
general specifications:  
Recommended Fuse Value: 50A  
detent  
number  
Panel  
marking  
actual  
Freq.  
Recommended Fuse Type: MAXI® or AGU  
Full counter-clockwise: 53  
01 . . . . . . . . . . . . . . . . . . . . . . . . . . . .53  
02 . . . . . . . . . . . “50” . . . . . . . . . . . .53  
03 . . . . . . . . . . . . . . . . . . . . . . . . . . . .54  
04 . . . . . . . . . . . . . . . . . . . . . . . . . . . .54  
05 . . . . . . . . . . . . . . . . . . . . . . . . . . . .55  
06 . . . . . . . . . . . . . . . . . . . . . . . . . . . .57  
07 . . . . . . . . . . . . . . . . . . . . . . . . . . . .59  
08 . . . . . . . . . . . “60” . . . . . . . . . . . .61  
09 . . . . . . . . . . . . . . . . . . . . . . . . . . . .63  
10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .65  
11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .67  
12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .70  
13 . . . . . . . . . . . . . . . . . . . . . . . . . . . .72  
14 . . . . . . . . . . . . . . . . . . . . . . . . . . . .75  
15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .78  
16 . . . . . . . . . . . “80” . . . . . . . . . . . .81  
17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .85  
18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .88  
19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .93  
20 . . . . . . . “12 o’clock. . . . . . . .97  
21 . . . . . . . . . . . . . . . . . . . . . . . . . . . 102  
22 . . . . . . . . . . . . . . . . . . . . . . . . . . . 107  
23 . . . . . . . . . . . . . . . . . . . . . . . . . . . 113  
24 . . . . . . . . . . “120” . . . . . . . . . . 120  
25 . . . . . . . . . . . . . . . . . . . . . . . . . . . 127  
26 . . . . . . . . . . . . . . . . . . . . . . . . . . . 135  
27 . . . . . . . . . . . . . . . . . . . . . . . . . . . 144  
28 . . . . . . . . . . . . . . . . . . . . . . . . . . . 156  
29 . . . . . . . . . . . . . . . . . . . . . . . . . . . 169  
30 . . . . . . . . . . . . . . . . . . . . . . . . . . . 184  
31 . . . . . . . . . . . . . . . . . . . . . . . . . . . 203  
32 . . . . . . . . . . “200” . . . . . . . . . . 227  
33 . . . . . . . . . . . . . . . . . . . . . . . . . . . 254  
34 . . . . . . . . . . . . . . . . . . . . . . . . . . . 290  
35 . . . . . . . . . . . . . . . . . . . . . . . . . . . 337  
36 . . . . . . . . . . . . . . . . . . . . . . . . . . . 392  
37 . . . . . . . . . . . . . . . . . . . . . . . . . . . 426  
38 . . . . . . . . . . “500” . . . . . . . . . . 447  
39 . . . . . . . . . . . . . . . . . . . . . . . . . . . 467  
Full-clockwise: 470  
input sections:  
No. of Inputs: One Stereo Pair  
necessary equipment  
• Digital AC Voltmeter  
Input Type: Differential-balanced with RCA jack inputs  
Input Range: 100mV - 4V RMS  
• CD with a sine-wave test tone recorded at  
0 dB reference level in the frequency range  
to be amplified for that set of channels  
(50 Hz for subwoofer channels, 1 kHz for a  
midrange application). Do not use attenuated  
test tones (-10 dB, -20 dB, etc.).  
Do not increase any Input Sens.setting for  
any amplifier channel or channel pair in the  
system beyond the maximum level established  
during this procedure. Doing so will result in  
audible distortion and possible speaker damage.  
amplifier section:  
Amplifier Topology: NexD™ High Speed Class D  
Power Supply: Unregulated MOSFET switching type  
rated Power at 14.4V with less than  
1% tHd+noise (20Hz - 20 kHz)  
400W RMS x 1 @ 4 ohms  
the nine-step Procedure  
1) Disconnect the subwoofer(s) from the  
amplifier’s speaker output connectors.  
It will be necessary to re-adjust the  
Input Sens.if any equalizer boost is activated  
after setting the Input Sens.with this  
procedure. This applies to any EQ boost circuit,  
including source unit tone controls or EQ  
circuits. EQ cuts will not require re-adjustment.  
600W RMS x 1 @ 2 ohms  
rated Power @ 12.5V with less than  
1% tHd + noise (20Hz - 20 kHz)  
300W RMS x 1 @ 4 ohms  
2) Turn off all processing (bass/treble, loudness,  
EQ, etc.) on the source unit, processors (if  
used) and amplifier. Set fader control to center  
position and subwoofer level control to 3/4 of  
maximum (if used to feed the M600/1).  
3) Turn the amplifier’s Input Sens.control all  
the way down.  
4) Set the source unit volume to 3/4 of full  
volume. This will allow for reasonable gain  
overlap with moderate clipping at full volume.  
5) Using the chart on this page, determine the target  
voltage for input sensitivity adjustment according  
to the nominal impedance of the subwoofer  
system connected to the amplifier outputs.  
6) Verify that you have disconnected the  
subwoofer(s) before proceeding. Play a track  
with an appropriate sine wave (within the  
frequency range to be amplified by the M600/1)  
at 3/4 source unit volume.  
500W RMS x 1 @ 2 ohms  
Signal to Noise Ratio:  
>87 dB referred to rated power  
(A-weighted, 20 Hz-20 kHz noise bandwidth)  
>67 dB referred to 1W  
nom. impedance  
target aC Voltage  
40.0 V  
4Ω  
3Ω  
2Ω  
1Ω  
(A-weighted, 20 Hz-20 kHz noise bandwidth)  
Frequency Response: 7 Hz - 500 Hz (+0, -1dB)  
Damping Factor:  
37.3 V  
34.6 V  
>1000 @ 4 ohms / 50 Hz  
Not Recommended  
>500 @ 2 ohms / 50 Hz  
amplifier Filters:  
Amplifier Low-Pass Filter:  
State-variable, 12 dB/octave Butterworth or 24 dB/octave  
Linkwitz-Riley with continuously variable cutoff frequency  
selection from 50 - 500 Hz (defeatable).  
Infrasonic Filter:  
7) Connect the AC voltmeter to the speaker output  
connectors of the amplifier. Make sure you test  
the voltage at the correct connectors (+ and –).  
24 dB/octave Butterworth @ 30 Hz (defeatable).  
Preamp output:  
Buffered pass-through type.  
dimensions(lxwxH):  
8.52” x 7.09” x 2.05” (217mm x 180mm x 52mm)  
Due to ongoing product development, all specifications are subject to  
change without notice.  
12 | JL Audio - M600/1 Owner’s Manual  
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aPPendix d: troublesHooting  
“How do i properly set the input sensitivity on my amplifier?”  
“my amplifier shuts off once in a while, usually at higher volumes.”  
Check your voltage source and grounding point. The power supply  
Please refer to Appendix A (page 12) to set the input sensitivity for  
maximum, low-distortion output.  
of the M600/1 will operate with charging system voltages  
down to 10V. Shutdown problems at higher volume levels  
can occur when the charging system voltage (or remote  
turn-on voltage) drops below 10V. These dips can be of  
very short duration making them extremely difficult to  
detect with a common DC voltmeter. To ensure proper  
voltage, inspect all wiring and termination points. It may  
also be necessary to upgrade the ground wire connecting  
the battery to the vessel’s electrical ground and the power  
wire connecting the alternator to the battery. Many  
vessels employ small (10 AWG - 6 AWG) wire to ground  
the battery and to connect the alternator 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. Grounding problems are the  
leading cause of misdiagnosed amplifier “failures.”  
“my amplifier doesnt turn on.”  
Check the fuse, not just visually, but with a continuity meter. It is  
possible for a fuse to have poor internal connections that  
cannot be found by visual inspection. It is best to take the  
fuse out of the holder for testing. If no problem is found with  
the fuse, inspect the fuse-holder.  
Check the integrity of the connections made to each of the  
+12VDC”, “Ground”, and Remote” terminals. Ensure  
that no wire insulation is pinched by the terminal set screw  
and that each connection is tight.  
Check to make sure there is +12V at the “Remote” connection of the  
amplifier. In some cases, the turn-on lead from the source unit  
is insufficient to turn on multiple devices and the use of a relay  
is required. To test for this problem, jump the +12VDCwire  
to the Remoteterminal to see if the amplifier turns on.  
“i hear a repetitive ticking or popping sound coming out of the speaker(s).”  
Check the speaker wires for a possible short, either between  
the positive and negative leads or between either  
“my amplifier turns on, but there is no output.”  
Check the input signal using an AC voltmeter to measure the  
voltage from the source unit while an appropriate low-  
frequency test tone is played through the source unit  
(disconnect the input cables from the amplifier prior to this  
test). 50 Hz is a good choice. A steady, sufficient voltage  
(between 0.1 and 4.0-volts) should be present at the output of  
the signal cables.  
Check the output of the amplifier. Using the procedure explained in  
the previous check item (after plugging the input cables back  
into the amplifier) test for output at the speaker outputs of  
the amplifier. Remove the speaker wires from the amplifier  
while doing this to prevent unpleasant noise and possible  
speaker damage. Turn the volume up approximately half  
way. 5V AC or more should be measured at the speaker  
outputs. This output level can vary greatly between  
amplifiers but it should not be in the millivolt range with  
the source unit at half volume. If you are reading sufficient  
voltage, check your speaker connections as explained below.  
Check to ensure that the speaker wires are making a good  
connection with the metal inside the terminal block. The  
speaker wire connectors are designed to accept up to 8 AWG  
wire. Make sure to strip the wire to allow for a sufficient  
connection with the metal inside the terminal block.  
speaker lead and the vessel’s electrical ground. If a  
short is present, you will experience distorted and/  
or attenuated output. The “Status LED” will turn  
Amber (yellow) in this situation. It may be helpful to  
disconnect the speaker wires from the amplifier and use  
a different set of wires connected to a test speaker.  
Check the nominal load impedance to verify that each channel  
of the amplifier is driving a load equal to or greater than  
2 ohms in stereo mode (4 ohms bridged).  
“my amplifiers output fluctuates when i tap on it or hit a bump.”  
Check the connections to the amplifier. Make sure that the  
insulation for all wires has been stripped back far enough to  
allow a good contact area inside the terminal block.  
Check the input connectors to ensure that they all are making good  
contact with the input jacks on the amplifier.  
14 | JL Audio - M600/1 Owner’s Manual  
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installation notes:  
Use this diagram to document your amplifier’s switch and control positions.  
16 | JL Audio - M600/1 Owner’s Manual  
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installation notes:  
installation notes:  
18 | JL Audio - M600/1 Owner’s Manual  
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