JL Audio Car Amplifier J23602 User Manual

owner’s manual  
360W 2-Channel, Full-Range Amplifier  
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 our Technical Support Department  
at (954) 443-1100 during business hours.  
 
IMPORTANT  
!
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 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.  
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  
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.  
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.  
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.  
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.  
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.  
stupid mistakes to avoid  
Remote Turn-On  
Connector  
(pg. 6)  
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.  
Chassis Ground +12 V Power  
Speaker Outputs  
(pg. 10)  
Connector  
(pg. 5)  
Connector  
(pg. 5)  
• 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.  
Ground  
Remote  
+ �VDC  
FUSES  
LEFT CHANNEL  
RIGHT CHANNEL  
Serial Number:  
20A  
20A  
• Protect all system wires from sharp metal  
edges and wear by carefully routing them,  
tying them down and using grommets and  
loom where appropriate.  
Bridged  
Made in China  
Power Status  
Indicator  
(pg. 11)  
Left & Right  
Input Sensitivity  
Control  
(pg. 7)  
Filter Frequency  
Selector  
(pg. 11)  
Protection Status  
Indicator  
• 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.  
Preamp Output Jacks  
(pg. 8)  
(pg. 11)  
High-Level  
Input Jack  
(pg. 6,7)  
Left & Right  
Filter Mode  
Selector  
(pg. 8)  
Bass Boost  
Control  
(pg. 9)  
Preamp Input Jacks  
(pg. 6)  
Preamp  
Amplifier  
Inputs  
Outputs  
LEFT  
LEFT  
High-Level Inputs  
Power  
Protect  
|
|
HP Off LP  
Filter Mode  
50  
500  
Off +9dB  
Bass Boost  
min max  
Input Sens.  
Filter Frequency (Hz)  
RIGHT  
RIGHT  
2
JL Audio  
3
 
ProduCt desCriPtion  
Power ConneCtions  
The JL Audio J2-360.2 is a two-channel, full-  
range audio amplifier utilizing  
Class A/B technology.  
The J2-360.2 can be operated with a wide  
variety of source units and system configurations.  
For detailed specifications, please refer to  
Appendix B (page 13).  
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 the same size power wire as the  
wire connected to the “+12VDC” connection  
(minimum 4 AWG), 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).  
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.  
Any wires run through metal barriers (such as  
firewalls), must be protected with a high quality  
insulating grommet to prevent damage to the  
insulation of the wire. Failure to do so may result  
in a dangerous short circuit.  
Ground  
Remote  
+ 12VDC  
IMPORTANT  
!
tYPiCal installation sequenCe  
The following represents the sequence  
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.  
for a typical amplifier installation, using an  
aftermarket source unit or OEM Interface  
product. 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.  
7) Securely mount the amplifier using  
appropriate hardware.  
8) Connect the positive and negative power  
wires to the amplifier.  
9) Connect the remote turn-on wire  
to the amplifier.  
The J2-360.2’s +12VDCand 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 J2-360.2 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  
J2-360.2 with 4 AWG power wire.  
Fuse requirements  
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 2 AWG or larger  
power wire and a power distribution block if  
additional amplifiers are being installed with  
the J2-360.2.  
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.  
While the J2-360.2 has two 20A ATC fuses  
on its power connection panel, these do nothing  
to protect the vehicle from a dangerous short  
circuit in the power wire. They only protect the  
amplifier. It is absolutely vital that the main  
power lead 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 J2-360.2 is being run from that power  
wire, we recommend a 40A fuse be used. AFS,  
AGU or MAXI-type fuses are recommended.  
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 (40A for a  
single J2-360.2) 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 12)  
for the recommended input sensitivity  
setting method.  
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 and ground wires to the  
amplifier, strip 1/2-inch (12 mm) of insulation  
from each wire and insert the bare wire into the  
the appropriate terminal block positions on the  
J2-360.2. Use a Phillips screwdriver to secure the  
wire via the screw on the top of each terminal.  
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, 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.  
FUSES  
20A  
20A  
16) Enjoy the fruits of your labor with your  
favorite music.  
4
JL Audio  
5
 
IMPORTANT  
!
turn-on lead  
inPut sensitivitY Controls  
The J2-360.2 is turned on and off  
using a conventional +12V remote turn-  
on lead, typically controlled by the  
source unit’s remote turn-on output.  
1) Low-Level Inputs: A standard left/  
right pair of RCA type jacks in the  
Amplifier Inputs” section is used for  
preamp level (low-level) signal input  
on the J2-360.2. This is the preferred  
connection method whenever available.  
Make sure you observe correct polarity in  
making the “High Level Input” connections.  
Failure to do so will reduce bass and affect  
stereo imaging.  
The control labeled “Input Sens.” can be used  
to match the source unit’s output voltage to the  
input stage the amplifier 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.)  
The connections for the “High Level Inputs” plug  
wires are as follows from left to right on the plug:  
Ground  
Remote  
+ 12VDC  
Channels 1&2 (FRONT)  
White: Left Positive (+)  
mp  
ts  
Amplifier  
Inputs  
White/Black: Left Negative (–)  
Black: Common Ground (rarely used)*  
Gray: Right Positive (+)  
LEFT  
Gray/Black: Right Negative (–)  
m
In  
Channels 3&4 (REAR or SUB)  
Green: Left Positive (+)  
min max  
Input Sens.  
Green/Black: Left Negative (–)  
Black: Common Ground (rarely used)*  
Purple: Right Positive (+)  
T
RIGHT  
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.  
18 AWG wire is more than adequate for  
the remote turn-on connection. To connect  
the remote turn-on wire to the amplifier, strip  
1/2-inch (12 mm) of insulation from the wire  
and insert it into the “Remote” receptacle on the  
power connector. Tighten the connector down  
using a Phillips screwdriver.  
Purple/Black: Right Negative (–)  
2) High-Level Inputs: If your system does  
not offer a preamp level signal option, you  
can connect speaker level signals directly to  
the “High-Level Inputs” connectors using  
the supplied mating connectors and wire  
harnesses. Simply splice the appropriate  
left/right and positive/negative wires to the  
included harnesses and plug the harness into  
the “High-Level Inputs” connectors on the  
amplifier. The J2-360.2 will attenuate the high-  
level signals to make them compatible with its  
input stages.  
*The only time you will use the Common Ground  
connections is with some older (pre-1980s) factory  
systems or head units that ground their speakers to  
chassis ground. To use these connections, ground  
the black wires on the plugs to chassis ground and  
only connect the Left and Right Positive plug wires  
to the factory radio outputs.  
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 any or all “Input Sens.”  
levels downward if this is required to achieve the  
desired system balance.  
IMPORTANT  
!
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.  
inPut seCtions  
The J2-360.2’s has one pair of stereo  
inputs.The input section input section  
offers two input connection methods, one  
for high-level (speaker level) signals and  
one for low-level (preamp level) signals.  
High-Level Inputs  
6
JL Audio  
7
 
Filter Controls  
PreamP outPuts  
sPeaker outPuts  
The active filter built into the J2-360.2 can  
be used to eliminate potentially harmful and/  
or undesired frequencies from making their way  
through the amplifier section to the speaker(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.  
2) “Filter Freq. (Hz)” The J2-360.2 has separate  
Filter Frequency controls in each Channel  
Controls section for the low-pass filter and  
the high-pass filter. You will only use one of  
these in each channel section, depending on  
which “Filter Mode” you have selected (or  
none of them if you have selected the “Off”  
position for the “Filter Mode”).  
The J2-360.2 incorporates a pass-through  
preamp output section, so that additional  
amplifiers can be easily added to the system. This  
pass-through pre-amp output delivers the same  
signals that are fed into the amplifier's inputs.  
The J2-360.2’s speaker outputs are designed to  
accept 16 AWG - 8 AWG wire.  
LEFT CHANNEL  
RIGHT CHANNEL  
Preamp  
Outputs  
Am  
I
When active, the filter in the J2-360.2 is fully  
variable between 50 Hz and 500 Hz via the  
control knob labeled “Filter Frequency (Hz)”.  
The “9 o’clock” position corresponds to 80 Hz  
and is a good starting point for system tuning.  
LEFT  
Bridged  
|
|
HP Off LP  
Filter Mode  
“bass boost” Controls  
Each channel pair of the J2-360.2 includes a  
single band, boost-only bass equalizer controlled  
by a rotary knob marked “Bass Boost”.  
This control has a boost range of 0dB (full-  
counterclockwise) to +9dB (full-clockwise) and is  
centered at 45 Hz.  
J2-360.2 is designed to deliver power into  
speaker loads equal to or greater than 2 ohms per  
channel when using a “stereo” configuration and  
speaker loads equal to or greater than 4 ohms  
when using a “bridged” configuration.  
50  
500  
RIGHT  
Filter Frequency (Hz)  
The preamp output signal is not affected by the  
Bass Boostprocessing selected for the amplifier  
or by any crossover filter selected (if the input  
signal is full-range, the preamp output will be  
full-range).  
IMPORTANT  
!
1) “Filter Mode” Control: The J2-360.2 employs  
a 12dB per octave filter. This filter can be  
configured into one of two filter types or  
defeated completely by way of the three-  
position Filter Modeswitch:  
Speaker loads below 2 ohms nominal per  
channel are not recommended and may cause  
the amplifier to initiate a protection mode.  
Note: The signal level of the “Preamp Outputis  
always line-level (low voltage).  
“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  
the J2-360.2’s in a bi-amplified system.  
Off”: 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 crossovers or requiring full-  
range reproduction from the J2-360.2.  
bridging Considerations  
Prote  
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 J2-360.2 has been designed  
for bridging of its channels without the need for  
input inversion adaptors.  
Oꢀ +9dB  
z)  
Bass Boost  
“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 the  
J2-360.2’s in a bi-amplified system.  
To bridge a pair of channels, use the  
Left +” and “Right –speaker connectors only  
(the “Left –and Right +remain unused).  
When bridged, the amplifier will deliver  
optimum power into a 4 ohm load.  
8
JL Audio  
 
9
amPliFier status indiCator ligHts &  
ProteCtion CirCuitrY  
There are two status indicator lights on the  
control panel of the amplifier.  
serviCing Your amPliFier  
IMPORTANT  
!
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.  
When bridged, the amplifier  
will deliver 360W x 1 into a 4 ohm load or  
220W 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.  
H
Power  
Protect  
+9dB  
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.  
ass Boost  
Do not do this!  
When the J2-360.2 is 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) Power(Green): lights to indicate that the  
amplifier is turned on and operating normally.  
Located at the far left of the control panel.  
Jl audio technical support:  
(954) 443-1100  
9:00 AM – 5:30 PM (Eastern Time Zone)  
Monday - Friday  
2) Protect(Red): Indicates that the amplifier  
protection circuitry has been activated  
1) Left Channel Only or Right Channel Only  
Information: If you wish to send a left-only  
or right-only signal to the J2-360.2, use a  
“Y-Adaptor” to split the single channel signal  
into both left and right RCA inputs. This  
option is useful when using the J2-360.2 to  
drive left channel speakers only and another  
J2-360.2 to drive right channel speakers only.  
to prevent product failure due to thermal  
overload, short-circuit or a dangerously  
low impedance connected to the amplifier  
outputs. Connecting the speaker outputs  
to an impedance lower than 2 ohms stereo  
(4 ohms bridged) will cause this protection  
mode to activate. When this protection mode  
is activated, the amplifier will shut down to  
protect its circuitry. When the problem is  
corrected, the amplifier will return to normal  
operation and the “Protect” LED will shut off.  
2) Left + Right Channel Information:  
When bridged and fed by a stereo input, the  
J2-360.2 will automatically combine the left  
and right input channels into a summed mono  
(left + right) channel. This option is useful  
when using a the J2-360.2 to drive a subwoofer  
system or a summed mono center channel.  
10  
JL Audio  
11  
 
aPPendix a:  
aPPendix b:  
input sensitivity level setting  
8) Increase the “Input Sens.” control until the  
target voltage is observed with the voltmeter.  
9) Once you have adjusted the amplifier 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.  
J2-360.2 specifications  
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 in installation bays.  
general specifications:  
Recommended Fuse Value: 40A  
Recommended Fuse Type: AFS, AGU or MaxiFuse™ at  
battery, 2 x 20A ATC fuses on amplifier chassis  
necessary equipment  
input sections:  
• Digital AC Voltmeter  
No. of Inputs: One Stereo Pair  
• 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.).  
Low-Level Inputs: Single-ended with RCA jack inputs  
Low-Level Input Range: 200mV - 4V RMS  
High-Level Inputs: Single-ended with molded connector  
High-Level Input Range: 2V - 10V RMS  
IMPORTANT  
!
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: Class A/B with Dual N-Channel  
the nine-step Procedure  
MOSFET output stage  
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 connected, set the amplifier’s  
Remote Bass Control at maximum (full  
clockwise).  
It will be necessary to re-adjust the  
“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.  
Power Supply: PWM switching type, unregulated  
Rated Power with less than 1% THD (14.4V supply):  
Stereo, all channels driven:  
110W RMS x 2 @ 4 ohms  
135W RMS x 2 @ 3 ohms  
180W RMS x 2 @ 2 ohms  
Bridged, all channels driven:  
220W RMS x 1 @ 8 ohms  
3) Turn the “Input Sens.” control all the  
way down.  
270W RMS x 1 @ 6 ohms  
nom.  
impedance  
target aC voltage  
360W RMS x 1 @ 4 ohms  
stereo  
bridged  
42 V  
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.  
21 V  
21 V  
21 V  
20 V  
19 V  
8Ω  
6Ω  
4Ω  
3Ω  
2Ω  
Frequency Response: 10 Hz - 35 kHz +/- 0.5 dB  
40 V  
Crossover sections:  
38 V  
Filter Type: 12dB/octave High-Pass or Low-Pass with  
continuously variable cutoff frequency selection from  
50 - 500 Hz. Defeatable.  
not recommended  
not recommended  
6) Verify that you have disconnected  
the speakers before proceeding. Play  
a track with an appropriate sine wave  
(within the frequency range to be  
Preamp output:  
2-Channel, pass-through with unity gain, RCA-type jacks.  
amplified) at 3/4 source unit volume.  
7) Connect the AC voltmeter to the speaker output  
connectors of the amplifier. Make sure you test  
the voltage at the correct connectors (+ and –).  
dimensions (lxwxH):  
12.80" x 9.60" x 2.15" (325 mm x 244 mm x 55 mm)  
Due to ongoing product development, all specifications are subject to  
change without notice.  
12  
JL Audio  
13  
 
aPPendix C: troublesHooting  
“How do i properly set the input sensitivity on my amplifier”  
“my amplifier turns on, but there is no output”  
Check the input signal using an AC voltmeter to measure the  
Please refer to Appeaset the input sensitivity for maximum, low-  
distortion output.  
voltage 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 8.0-volts) should be present at the output of  
the signal cables.  
“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. If this  
does not work, proceed to the next step.  
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.  
“my amplifiers output fluctuates when i tap on it or hit a bump”  
Check the connections to the amplifier. Make sure that the  
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.  
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.  
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JL Audio  
15  
 
installation notes:  
Use this diagram to document your amplifier’s switch and control positions.  
Preamp  
Outputs  
Amplifier  
Inputs  
LEFT  
LEFT  
High-Level Inputs  
Power  
Protect  
|
|
HP Off LP  
Filter Mode  
50  
500  
Oꢀ +9dB  
Bass Boost  
min max  
Input Sens.  
Filter Frequency (Hz)  
RIGHT  
RIGHT  
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JL Audio  
 
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installation notes:  
installation notes:  
18  
JL Audio  
 
19  

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