JL Audio Speaker e1800D User Manual

JL AUDIO e1800D  
monoblock subwoofer amplifier  
o w n e r ’ s m a n u a l  
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 and extended warranty  
coverage, 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 (Eastern Time Zone).  
 
PRODUCT DESCRIPTION  
POWER CONNECTIONS  
The JL Audio e1800D is a monoblock subwoofer  
amplifier utilizing proprietary and patented Class D  
technology. Its frequency response is limited to the  
range below 250 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 11).  
be necessary to upgrade the battery ground wire.  
(See page 5 for important notice).  
7) Securely mount the amplifier using the  
supplied screws.  
8) Connect the positive and negative power  
wires to the amplifier.A fuse near the amplifier is  
not necessary.  
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 ground connection should be made using  
the same gauge wire as the power connection  
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, metal-to-metal  
connection between the chassis and the termination  
of the ground wire.The use of a star washer to lock  
down the connection is advisable.  
9) Connect the remote turn-on wire to  
the amplifier.  
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 JLAudio dealer for assistance.  
10) Connect the input cables to the amplifier.  
11) Connect the speaker wires 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 power wire fuse (80A for a  
single e1800D) and reconnect the negative  
battery post terminal.  
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 10) for the recommended input  
sensitivity setting method.  
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.  
IMPORTANT  
!
The e1800D's “+12VDC” and “Ground”  
connections are designed to accept 4 AWG power  
wire. 4 AWG is a minimum power wire size  
for this amplifier.  
If you are installing the e1800D with other  
amplifiers and wish to use a single main power  
wire, use 2 AWG or larger main power wire  
(depending on the overall current demands of all  
the amplifiers in the system).This 2 AWG or  
larger power wire should terminate into a  
distribution block mounted as close to the  
amplifiers as possible and should connect to the  
e1800D with 4 AWGpower wire.  
Please note that 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.  
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.  
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 power wire (minimum 4 AWG) 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 2 AWG or 1/0 AWG  
power wire if additional amplifiers are being  
installed with the e1800D.  
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 connected to  
the amplifier.  
4) Run signal cables and remote turn-on wire  
from the source unit to the amplifier  
mounting location.  
5) Run speaker wire from the speaker system 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  
the same size power wire as the wire connected to  
the “+12V” connection (min. 4 AWG), no longer  
than 36 inches (90 cm) from the amplifier to the  
ground connection point. In some vehicles, it may  
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  
e1800D is being run from that power wire, we  
recommend a 80A fuse be used. ANL (big blade  
fuse), AGU (big glass fuse) or MaxiFuse™ (big  
plastic-body fuse) types are recommended.  
No fuse is required or recommended directly  
before the amplifier power connection. If one is  
desired, we recommend the use of a 80A AGU fuse  
or MaxiFuse™ type.  
16) Enjoy the fruits of your labor with your  
favorite music.  
4
JL AUDIO e1800D  
JL AUDIO e1800D  
5
 
TURN-ON LEAD  
The e1800D 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 e1800D'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.  
which are acceptable and commonly used for  
filtering between mids 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 the e1800D can be  
used to eliminate potentially harmful and/or  
undesired frequencies from making their way  
through the amplifier section to the subwoofer(s).  
This serves to improve tonal balance and to avoid  
distortion and possible speaker failure. Correct use  
of this filter can substantially increase the longevity  
and fidelity of your audio system.  
fires directly into the listening environment is more  
likely to benefit from a 24 dB/octave slope.  
The above hint is not “set-in-stone”…  
You should always listen to the system carefully to  
determine the best choice as vehicle acoustics and  
other factors play a big role in choosing the most  
appropriate filter slope.  
IMPORTANT  
!
If you plan to use the “Pre-Outs” 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. (It's a great amplifier, but it doesn't  
do magic).  
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.  
2) 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 11) 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.  
3) Defeating the Amplifier Filter: The Low-  
Pass filter can also be defeated completely, by  
switching the “Mode/Slope” switch to the “Off”  
position.This is useful if you are using an external  
active crossover in the system. Keep in mind that  
turning the internal crossover off also defeats the  
“Advanced Bass Control” section processing  
(see page 9 for details).With the internal  
crossover turned off, the e1800D’s upper  
frequency response limit is 250 Hz, due to its  
bass-specific Class D design.  
AMPLIFIER CONTROLS  
Input Sensitivity  
This control, labeled “Input Sens., can be used  
to match the source unit's output voltage to the  
input stage of the e1800D 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.)  
To properly set the amplifier for maximum clean  
output, please refer to Appendix A (page 10). After  
using this procedure, you can then adjust the  
“Input Sens.level 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 10).  
Doing so will result in audible distortion and  
possible speaker damage.  
INPUT SECTION  
The e1800D has one input section with two  
distinct input connection options.  
1) A pair of traditional RCA type connections  
designed to accept input from source units with line  
level outputs.  
2) A four-pin connector designed to accept input  
from amplified sources such as factory source units  
or source units not equipped with line level outputs.  
The e1800D employs a sophisticated, variable,  
low-pass active filter for its internal channel.This  
feature is designed to attenuate frequencies above its  
filter frequency, so that the system's subwoofers do  
not reproduce any audible midrange content.  
1) Filter Operation:The low-pass filter in the  
e1800D is fully variable between 40 Hz and 200 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  
“Mode/Slope” switch.  
Depending on the subwoofer system and the  
vehicle, 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.  
Hint: A trunk mounted sub whose output has to  
"fight" through a rear deck or a back seat often  
benefits from the 12 dB/octave slope which lets  
more upper bass content pass through.A sub that  
BASS BOOST CONTROLS  
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),  
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.  
1) Bass Boost: This switch allows the user to  
activate a 6 dB boost centered at 48 Hz.The “Filter  
Mode” switch in the “Channel 1 & 2” section must  
be in the “LP” position for the bass boost to  
be functional.  
6
JL AUDIO e1800D  
JL AUDIO e1800D  
7
 
AMPLIFIER STATUS INDICATOR LIGHTS /  
PROTECTION CIRCUITRY  
There are two status indicator lights on the  
input / control end of the amplifier:  
SERVICINGYOUR 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) Remote Bass Port: This port allows you to  
connect an optional remote boost knob (sold  
separately, JL Audio Model RBC-1) that can be  
mounted in the front of the vehicle. With the  
RBC-1 connected, the boost is no longer limited to  
0 or +6 dB, allowing a range of 0 - 12 dB of boost  
to be selected.  
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.  
PRE-OUTS  
The e1800D’s “Pre-Outs” connectors output  
unprocessed (pass-through) left and right channel  
preamp level signals, permitting connection of  
additional amplifiers in a system.  
If you have any questions about the installation or  
setup of the amplifier not covered in  
this manual, please contact your dealer or the  
JL AUDIO Technical Department for assistance:  
(954) 443-1100  
1) “Power” (Green): lights to indicate that the  
amplifier is turned on and operating normally.  
2) “Protect 1 - Flashing Light” (Red): flashes to  
indicate that the amplifier’s Level 1 protection  
circuitry has been activated for one of the following  
two reasons.  
9:00 AM – 5:30 PM Eastern Time,  
Monday – Friday  
IMPORTANT  
!
Speaker loads below 2nominal are not  
recommended and may cause the amplifier to  
initiate a protection mode and shut itself off.  
You will notice that there are two “+” positive  
connections and two “–” negative connections.This  
is to facilitate multiple speaker wiring.The two  
positive and two negative connections are  
connected in parallel inside the amplifier. Connecting  
two speakers, each to one set of positive and  
negative terminals, will result in a parallel speaker  
connection. If only connecting one pair of speaker  
wires, it is not necessary to use both sets of  
connections.  
a)The impedance of the speaker(s)  
connected to the e1800D is less than 2.  
b)The vehicle’s charging system voltage has  
dropped momentarily below 8.2 volts.  
3) “Protect 2 - Constant Light” (Red):  
illuminates to indicate that the amplifier’s Level 2  
protection circuitry has been activated for one of  
the following two reasons.  
When using either the line level inputs (RCA  
input connections) or the “High Level Inputs”  
(four-pin connector), the output signals are identical  
to the input signals. If the “High Level Inputs” are  
used, the signal present at the “Pre-Outs” can still  
be sent to another JLAudio amplifier. In either case,  
the “Pre-Outs” signals are not affected by any  
settings in the “Amplifier Controls” or “Bass  
Boost Controls” sections.  
a)The amplifier has exceeded its safe  
operating temperature.This causes the amplifier to  
reduce power capability in order to protect its  
circuitry. When the amplifier’s temperature drops to  
a safe level, the red “Protect” indicator will shut off  
and the amplifier will return to normal operation.  
b)The amplifier protection circuitry has  
detected a dangerously low charging system  
voltage (consistantly below 8.2 volts).When the  
problem is eliminated, the amplifier will return to  
normal operation.  
IMPORTANT  
!
IMPORTANT  
!
If you plan to use the “Pre-Outs” 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.  
Do not attempt to “bridge” the outputs of this  
amplifier with the outputs of a second amplifier,  
including an identical one.  
IMPORTANT  
!
SPEAKER OUTPUTS  
The e1800D’s speaker outputs are designed to  
accept 8 AWG - 16 AWG wire.  
When parallel-connecting both positive and both  
negative high-level input connections as described  
above, make sure to connect negative (–) wires to  
negative (–) wires and positive (+) wires to  
possitive (+) wires.  
The e1800D is designed to deliver power into  
speaker loads equal to or greater than 2.  
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  
8
JL AUDIO e1800D  
JL AUDIO e1800D  
9
 
APPENDIX A:  
APPENDIX B:  
APPENDIX C:  
Input Sensitivity Level Setting  
Precise Frequency Selection Chart  
e1800D Specifications  
“FILTER FREQ” AMP FILTER  
Following the directions below will allow the  
installer to adjust the input sensitivity of the  
amplifier(s) simply and easily in just a few minutes  
using equipment which is commonly available in  
installation bays.  
9) Once you have adjusted the e1800D to its  
maximum low-distortion output level, lower the  
system volume (on the source unit) and reconnect  
the speaker(s).The “Input Sens.controls can now  
be adjusted downward if the amplifier requires  
attenuation to achieve the desired system balance.  
GENERAL SPECIFICATIONS:  
Recommended FuseValue: 80A  
Detent  
Number  
Panel  
Marking  
Actual  
Freq.  
Recommended Fuse Type: AGU or MaxiFuse™  
Full counter-clockwise: 53  
01 . . . . . . . . . . . . . . . . . . . . . . . .53  
02 . . . . . . . . .“50” . . . . . . . . .53  
03 . . . . . . . . . . . . . . . . . . . . . . . .53  
04 . . . . . . . . . . . . . . . . . . . . . . . .54  
05 . . . . . . . . . . . . . . . . . . . . . . . .54  
06 . . . . . . . . . . . . . . . . . . . . . . . .55  
07 . . . . . . . . . . . . . . . . . . . . . . . .55  
08 . . . . . . . . .“55” . . . . . . . . .56  
09 . . . . . . . . . . . . . . . . . . . . . . . .56  
10 . . . . . . . . . . . . . . . . . . . . . . . .57  
11 . . . . . . . . . . . . . . . . . . . . . . . .58  
12 . . . . . . . . . . . . . . . . . . . . . . . .59  
13 . . . . . . . . . . . . . . . . . . . . . . . .62  
14 . . . . . . . . .“60” . . . . . . . . .65  
15 . . . . . . . . . . . . . . . . . . . . . . . .65  
16 . . . . . . . . . . . . . . . . . . . . . . . .66  
17 . . . . . . . . . . . . . . . . . . . . . . . .70  
18 . . . . . . . . . . . . . . . . . . . . . . . .73  
19 . . . . . . . . . . . . . . . . . . . . . . . .77  
20 . . . . . . . . .“80” . . . . . . . . .81  
21 . . . . . . . . . . . . . . . . . . . . . . . .84  
22 . . . . . . . . . . . . . . . . . . . . . . . .88  
23 . . . . . . . . . . . . . . . . . . . . . . . .94  
24 . . . . . . . . . . . . . . . . . . . . . . .101  
25 . . . . . . . . . . . . . . . . . . . . . . .104  
26 . . . . . . . . .“120” . . . . . . . .115  
27 . . . . . . . . . . . . . . . . . . . . . . .118  
28 . . . . . . . . . . . . . . . . . . . . . . .128  
29 . . . . . . . . . . . . . . . . . . . . . . .137  
30 . . . . . . . . . . . . . . . . . . . . . . .146  
31 . . . . . . . . . . . . . . . . . . . . . . .164  
32 . . . . . . . . .“150” . . . . . . . .177  
33 . . . . . . . . . . . . . . . . . . . . . . .193  
34 . . . . . . . . . . . . . . . . . . . . . . .197  
35 . . . . . . . . . . . . . . . . . . . . . . .209  
36 . . . . . . . . . . . . . . . . . . . . . . .213  
37 . . . . . . . . . . . . . . . . . . . . . . .216  
38 . . . . . . . . .“200” . . . . . . . .218  
39 . . . . . . . . . . . . . . . . . . . . . . .225  
Full-clockwise: 225  
INPUT SECTIONS:  
No. of Inputs: One Stereo Pair  
Necessary Equipment  
• Digital ACVoltmeter  
Input Type: Differential, noise-cancelling with RCA jack  
inputs (low-level) and multi-pin jack (high-level)  
Input Range: 200mV - 8V RMS  
IMPORTANT  
!
• 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 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: H-Bridge, Class D Mono  
with impedance optimization and patented  
discrete drive circuitry  
It will be necessary to re-adjust the  
Power Supply: Unregulated MOSFET switching type  
Rated Power @ 12.5V (Mono):  
480W RMS x 1 @ 4  
The Nine-Step Procedure  
“Input Sens.for the affected channels 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.  
1) Disconnect the speaker(s) from the  
amplifier’s speaker output connectors.  
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 e1800D).  
800W RMS x 1 @ 2Ω  
THD at Rated Power: <0.08%  
(20 Hz - 250 Hz)  
Rated Power @ 14.4V (Mono):  
640W RMS x 1 @ 4Ω  
1000W RMS x 1 @ 2Ω  
3)Turn the “Input Sens.control all the  
way down.  
THD at Rated Power: <1%  
Nom. Impedance  
Target ACVoltage  
(20 Hz - 250 Hz)  
4(or higher)  
43.8V  
42.0V  
40.0V  
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 speaker  
system connected to the amplifier outputs.  
6)Verify that you have disconnected the  
speakers before proceeding. Play a track with an  
appropriate sine wave (within the frequency range  
to be amplified by the e1800D) at 3/4 source  
unit volume.  
Signal to Noise Ratio: >95 dB referred to rated power  
(A-weighted, 20 Hz - 20 kHz noise bandwidth)  
Frequency Response: 10 - 250 Hz (+0, -1 dB)  
Damping Factor: >500 @ 4/50 Hz, >250 @ 2/50 Hz  
Input Range: 200mV - 8V RMS  
3Ω  
2Ω  
AMPLIFIER FILTER:  
Amplifier Low-Pass Filter: State-variable, 12 dB/octave  
Butterworth or 24 dB/octave Linkwitz-Riley with  
continuously variable cutoff frequency selection  
from 40 - 200 Hz. Defeatable.  
7) Connect the AC voltmeter to the speaker  
output connectors of the amplifier using either  
possitive (+) connection and either negative (-)  
connection.  
PREAMP OUTPUT:  
Pass-through type. Output signal is identical to the signal at  
the Amp Inputs.  
8) Increase the “Input Sens.control until the  
target voltage is observed with the voltmeter.  
DIMENSIONS (LxWxH):  
15.75" x 9.25" x 2.36" (400mm x 235mm x 60mm)  
Due to ongoing product development, all specifications are  
subject to change without notice.  
10  
JL AUDIO e1800D  
JL AUDIO e1800D  
11  
 
APPENDIX D: TROUBLE SHOOTING  
MY AMPLIFIER DOESNTTURN ON”  
MY AMPLIFIERTURNS ON, BUTTHERE IS NO OUTPUT”  
Check the input signal using an AC voltmeter to measure the voltage  
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 “+12V”  
wire to the “Remote” terminal to see if the amplifier turns on.  
If this does not work, proceed to the next step.  
from the source unit while an appropriate test tone is played  
through the source unit (disconnect the input cables from the  
amplifier prior to this test).The frequency used should be in  
the range that is to be amplified by the amplifier  
(example: 50 Hz for a sub bass application or 1 kHz for a full  
range / high-pass application). A steady, sufficient voltage  
(between 0.2 and 8.0V) should be present at the output of  
the signal cables.  
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 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. Unless you enjoy test tones at high levels, it is a good  
idea to remove the speaker wires from the amplifier while  
doing this. Turn the volume up approximately half way.  
5V 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  
12 AWG wire. Make sure that 1/2 inch (12 mm) of insulation  
has been stripped from the end of each wire and the bare  
wire is seated firmly in the terminal block so that no bare  
wire is exposed.  
I GET A DISTORTED / ATTENUATED SOUND COMING OUT OFTHE SPEAKER(S)”  
Check the input signal and input signal cables to make sure signal is  
present at the “Amplifier Inputs” and the cables are not  
pinched or loose. It may be helpful to try a different set of  
cables and/or a different signal source to be sure.  
MY AMPLIFIER SHUTS OFF ONCE IN A WHILE, USUALLY AT HIGHERVOLUMES”  
Check your voltage source and grounding point.The power supply of  
the e1200 will operate with charging system voltages down to  
8V. Shutdown problems at higher volume levels can occur  
when the charging system voltage drops below 8V.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 vehicle’s chassis and the power wire connecting the  
alternator to the battery. Many vehicles employ small  
MY AMPLIFIERS OUTPUT FLUCTUATES WHEN ITAP 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  
(10 AWG - 6 AWG) wire to ground the battery to the vehicle’s  
chassis 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  
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.  
mis-diagnosed amplifier failures.  
HOW DO I PROPERLY SETTHE INPUT SENSITIVITY ON MY AMPLIFIER”  
Please refer to Appendix A (page 10) to set the input sensitivity for  
maximum, low-distortion output.  
12  
JL AUDIO e1800D  
JL AUDIO e1800D  
13  
 
INSTALLATION NOTES:  
Use this diagram to document your amplifier’s switch and control positions.  
14  
JL AUDIO e1800D  
JL AUDIO e1800D  
15  
 
LIMITEDWARRANTY - AMPLIFIERS (USA)  
JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of ninety  
(90) days from the original date of purchase.The warranty term is extended to two (2) years if installation is  
performed or approved by an authorized JL AUDIO dealer (proof of installation or approval required on  
purchase receipt).  
This warranty is not transferrable and applies only to the original purchaser from an authorized JL AUDIO  
dealer. Should service be necessary under this warranty for any reason due to manufacturing defect or  
malfunction, JL AUDIO will (at its discretion), repair or replace the defective product with new or remanufactured  
product at no charge. Damage caused by the following is not covered under warranty: accident, misuse, abuse,  
product modification or neglect, failure to follow installation instructions, unauthorized repair attempts,  
misrepresentations by the seller.This warranty does not cover incidental or consequential damages and does not  
cover the cost of removing or reinstalling the unit(s). Cosmetic damage due to accident or normal wear and tear  
is not covered under warranty.  
Warranty is void if the products serial number has been removed or defaced.  
Any applicable implied warranties are limited in duration to the period of the express warranty as provided  
herein beginning with the date of the original purchase at retail, and no warranties, whether express or implied,  
shall apply to this product thereafter. Some states do not allow limitations on implied warranties, therefore these  
exclusions may not apply to you.This warranty gives you specific legal rights, and you may also have other rights  
which vary from state to state.  
If you need service on your JL AUDIO product:  
All warranty returns should be sent to JL AUDIO ’s Amplifier Service Facility freight-prepaid through an  
authorized JL AUDIO dealer and must be accompanied by proof of purchase (a copy of the original sales receipt).  
Direct returns from consumers or non-authorized dealers will be refused unless specifically authorized by  
JL AUDIO with a valid return authorization number.  
Warranty expiration on products returned without proof of purchase will be determined from the  
manufacturing date code. Coverage may be invalidated as this date is previous to purchase date. Non-defective  
items received will be returned freight-collect. Customer is responsible for shipping charges and insurance in  
sending the product to JL AUDIO. Freight damage on returns is not covered under warranty.  
For Service Information in the U.S.A. please call:  
JL Audio customer service: (954) 443-1100  
during normal business hours (9:00 AM – 5:30 PM Eastern Time)  
JL Audio, Inc  
10369 North Commerce Pkwy.  
Miramar, FL 33025  
(do not send product for repair to this address)  
InternationalWarranties:  
Products purchased outside the United States of America are covered only  
by that country’s distributor and not by JL Audio, Inc.  
Absolute Symmetry Class AB Amplifier Circuit is covered by U.S. Patent #6,294,959 and is  
pending in the countries listed below. Austria,Belgium,Brazil,Canada,China,France,Germany,Indonesia,  
Italy, Japan, Republic of Korea, Mexico, Netherlands, Norway, Russian Federation, Singapore, Sweden,  
Switzerland, United Kingdom, and all other PCT countries.  
e1800DMAN-05-2004  
 

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