JL Audio Car Amplifier J23204 User Manual

owner’s manual  
320W 4-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.  
 
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.  
CH 1 & CH 2  
Speaker Outputs  
(pg. 9)  
CH 3 & CH 4  
+12 V Power Chassis Ground  
Speaker Outputs  
(pg. 9)  
Fuses  
(pg. 5)  
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.  
CHANNEL 1 (L)  
CHANNEL 2 (R)  
CHANNEL 3 (L)  
CHANNEL 4 (R)  
FUSES  
Serial Number:  
30A  
30A  
• 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  
Bridged  
Made in China  
Power Status  
Indicator  
(pg. 11)  
Channel Input  
Selector  
CH 1 & CH 2  
Preamp Input Jacks  
(pg. 6)  
Protection Status  
Indicator  
(pg. 7)  
(pg. 11)  
• 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.  
CH 3 & CH 4  
Bass Boost  
Control  
(pg. 9)  
High-Level  
Input Jack  
(pg. 6,7)  
Left & Right  
Preamp Output Jacks  
(pg. 9)  
High Level  
Input Jack  
(pg. 6,7)  
Bass Boost  
Control  
(pg. 9)  
Preamp Input Jacks  
(pg. 6)  
Channel 1 & 2 Controls  
Pre-Outs  
Amplifier Inputs  
Channel 3 & 4 Controls  
Power  
CH 3&4  
Input From  
Protect  
LEFT  
CH 1 (Left)  
CH 3 (Left)  
Bass Boost  
Bass Boost  
|
1&2 3&4  
High-Level Inputs  
High-Level Inputs  
Off +12dB  
Off +12dB  
40  
Low-Pass  
Filter Frequency (Hz)  
150  
60  
1. 2k  
min max  
Input Sens.  
min max  
Input Sens.  
60  
High-Pass  
Filter Frequency (Hz)  
1. 2k  
40  
150  
High-Pass  
Low-Pass  
|
|
HP Off LP  
Filter Mode  
|
|
HP Off LP  
Filter Mode  
RIGHT  
CH 2 (Right)  
CH 4 (Right)  
Input Sensitivity  
Control  
Low-Pass Filter  
Frequency Control  
(pg. 8)  
High-Pass Filter  
Frequency Control  
(pg. 8)  
Filter Mode  
Selector  
(pg. 8)  
(pg. 7)  
Filter Mode  
Selector  
(pg. 8)  
High-Pass Filter  
Frequency Control  
(pg. 8)  
Input Sensitivity  
Control  
(pg. 7)  
Low-Pass Filter  
Frequency Control  
(pg. 8)  
2
JL Audio  
3
 
ProduCt desCriPtion  
Power ConneCtions  
The JL Audio J2-320.4 is a four-channel, full-  
range audio amplifier utilizing  
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.  
Class B technology for all channels.  
The J2-320.4 can be operated with a wide  
variety of source units and system configurations.  
For detailed specifications, please refer to  
Appendix B (page 13).  
+ 12VDC  
Remote  
0A  
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 J2-320.4’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 J2-320.4 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  
J2-320.4 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 J2-320.4.  
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 J2-320.4 has two 30A 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 J2-320.4 is being run from that power  
wire, we recommend a 60A fuse be used. AFS 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 (60A for a  
single J2-320.4) 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  
J2-320.4. 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.  
R)  
FUSES  
+
30A  
30A  
16) Enjoy the fruits of your labor with your  
favorite music.  
4
JL Audio  
5
 
turn-on lead  
The J2-320.4 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 J2-320.4. 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.  
If you wish to feed all four channels by using  
only two channels of input, set the “CH 3&4  
Input From” switch to “1&2” and use only the  
inputs to channels 1 & 2.  
The connections for the “High Level Inputs” plug  
inPut sensitivitY Controls  
wires are as follows from left to right on the plug:  
The controls labeled “Input Sens.” located in  
each Channel Controlssection can be used  
to match the source unit’s output voltage to the  
input stage of each pair of amplifier channels  
for maximum clean output. Rotating the control  
clockwise will result in higher sensitivity (louder  
for a given input voltage). Rotating the control  
counter-clockwise will result in lower sensitivity  
(quieter for a given input voltage.)  
+ 12VDC  
Remote  
0A  
Channels 1&2 (FRONT)  
White: Left Positive (+)  
White/Black: Left Negative (–)  
Black: Common Ground (rarely used)*  
Gray: Right Positive (+)  
Amplifier Inputs  
CH 1 (Left)  
CH 3 (Left)  
Gray/Black: Right Negative (–)  
Channels 3&4 (REAR or SUB)  
Green: Left Positive (+)  
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.  
Green/Black: Left Negative (–)  
Black: Common Ground (rarely used)*  
Purple: Right Positive (+)  
CH 2 (Right)  
CH 4 (Right)  
& 2 Controls  
CH 3&4  
Pr  
Input From  
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 J2-320.4 will attenuate the high-  
level signals to make them compatible with its  
input stages.  
|
1&2 3&4  
nputs  
*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.  
1.2k  
min max  
Input Sens.  
-Pass  
Hz)  
“CH 3&4 Input From” Switch  
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.  
If you wish to send four discrete channels of  
input into the J2-320.4, simply use all four inputs  
(Channels 1 & 2 and Channels 3 & 4) and set the  
CH 3&4 Input From” switch to “3&4”.  
inPut seCtions  
The J2-320.4’s has two input sections: one for  
Channels 1&2 and another for Channels 3&4.  
These input sections allows you to send signals to  
the amplifier sections through the use of either  
two or four inputs. Each input section offers  
two input connection methods, one for high-  
level (speaker level) signals and one for low-level  
(preamp level) signals.  
Channel 1 & 2 Contro  
wer  
In  
2 Controls  
CH 3&4  
Pre  
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.  
1
Input From  
High-Level Inputs  
|
1&2 3&4  
puts  
150  
60  
1.2k  
m
I
w-Pass  
High-Pass  
Filter Frequency (Hz)  
1.2k  
Pass  
min max  
Input Sens.  
z)  
R
6
JL Audio  
 
7
Filter Controls  
“bass boost” Controls  
The active filter built into each channel  
section of the J2-320.4 can be used to eliminate  
potentially harmful and/or undesired frequencies  
from making their way through the amplifier  
sections to the speaker(s). This serves to improve  
tonal balance and to avoid distortion and possible  
speaker failure. Correct use of these filters can  
substantially increase the longevity and fidelity  
of your audio system.  
attenuate frequencies above the selected filter  
frequency at a rate of 12dB per octave. This is  
useful for connection of subwoofer(s) to one  
or both of the J2-320.4’s channel pairs in a  
bi-amplified system.  
Each channel pair of the J2-320.4 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 +12dB (full-clockwise) and  
is centered at 45 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).  
2) “Filter Freq. (Hz)” The J2-320.4 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”).  
Note: The signal level of the “Preamp Outputis  
always line-level (low voltage).  
sPeaker outPuts  
The J2-320.4’s speaker outputs are designed to  
accept 16 AWG - 8 AWG wire.  
Each pair of the J2-320.4’s channels are  
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 per bridged pair of  
channels when using a “bridged” configuration.  
Po  
Bass Boost  
Channel 1 & 2 Contro  
Power  
I
Off +12dB  
Bass Boost  
The High-Pass filters in the J2-320.4 are fully  
variable between 60 Hz and 1.2 kHz (1200 Hz) via  
the control knobs labeled “High-Pass”. The “8  
o’clock” position corresponds to 80 Hz and is a  
good starting point for system tuning.  
4
L
High-Level Inputs  
|
|
HP Off LP  
Filter Mode  
Off +12dB  
40  
Low-Pass  
Filter Frequency (Hz)  
150  
60  
1.2k  
High-Pass  
|
|
HP Off LP  
Filter Mode  
Channel 1 & 2 Contr  
The Low-Pass filters in the J2-320.4 are fully  
variable between 40 Hz and 150 Hz via the  
control knobs labeled “High-Pass”. The “12  
o’clock” position corresponds to 80 Hz and is a  
good starting point for system tuning.  
Pre-outs  
Power  
The J2-320.4 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 a  
summed stereo signal , combining the Ch 1 and 3  
signals into a Left Preamp Output Signal and the  
Ch. 2 and 4 signals into a Right Channel Preamp  
Output signal.  
Bass Boost  
High-Level Inputs  
1) “Filter Mode” Control: The J2-320.4 employs a  
12dB per octave filter for each pair of channels  
(one filter for channels 1&2 and another filter  
for channels 3&4). Each of these filters can  
be configured independently into one of two  
filter types or defeated completely by way of the  
three-position Filter Modeswitches:  
Off +12dB  
40  
Low-Pass  
Filter Frequency (Hz)  
150  
60  
1.2k  
High-Pass  
|
|
HP Off LP  
Filter Mode  
“HP” (High-Pass): Configures the filter to  
attenuate frequencies below the selected filter  
frequency at a rate of 12dB per octave. This is  
useful for connection of component speakers  
to one or both of the J2-320.4’s channel pairs in  
a bi-amplified system.  
Pre-Outs  
Speaker loads below 2 ohms nominal per  
channel are not recommended and may cause  
the amplifier to initiate a protection mode.  
&4  
om  
LEFT  
CH  
&4  
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 one or  
both of the J2-320.4’s channel pairs.  
max  
ens.  
RIGHT  
CH 2  
“LP” (Low-Pass): Configures the filter to  
8
JL Audio  
9
 
bridging Considerations  
amPliFier status indiCator ligHts &  
ProteCtion CirCuitrY  
There are two status indicator lights on the  
control panel of the amplifier.  
serviCing Your tma amPliFier  
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 J2-320.4 has been designed for  
bridging of its channel pairs without the need for  
input inversion adaptors.  
1) Left Channel Only or Right Channel Only  
Information: If you wish to send a left-only  
or right-only signal to a pair of the J2-320.4’s  
channels, use a “Y-Adaptor” to split the single  
channel signal into both left and right RCA  
inputs. This option is useful when using a  
pair of the J2-320.4’s channels to drive left  
channel speakers only and the other pair of  
the J2-320.4’s channels to drive right channel  
speakers only.  
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.  
Ch  
ols  
Power  
Protect  
Bass Boost  
Bass Bo  
To bridge a pair of channels, use the  
H
el Inputs  
Left +” and “Right –speaker connectors only  
(the “Left –and Right +remain unused).  
When bridged, each channel will deliver  
optimum power into a 4 ohm load.  
2) Left + Right Channel Information:  
When bridged and fed by a stereo input, a pair  
of the J2-320.4’s channels will automatically  
combine the left and right channels into a  
summed mono (left + right) channel. This  
option is useful when using a pair of the  
J2-320.4’s channels to drive a subwoofer system  
or a summed mono center channel.  
Off +12dB  
Off  
+
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.  
40  
150  
2k  
s
40  
150  
Low-Pass  
Low-Pass  
|
HP Of  
Filter M  
|
|
HP Off LP  
Filter Mode  
Frequency (Hz)  
Filter Fr  
When a pair of channels are bridged, they  
will deliver 160W x 1 into a 4 ohm load or  
120W x 1 into an 8 ohm load. Operating a  
pair of bridged channels into a load lower  
than 4 ohms is not recommended.  
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  
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.  
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.  
Do not do this!  
When a pair of the J2-320.4’s channels are  
operating in bridged mode, the output will be in  
mono (only one channel). This mono channel  
can contain right channel only information,  
left channel only information or the sum of  
the information from both the right and left  
channels. In order to achieve one of these options,  
configure the inputs to that pair of channels in  
one of these two ways:  
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.  
J2-320.4 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: 60A  
Recommended Fuse Type: AFS, AGU or MaxiFuse™ at  
battery, 2 x 30A ATC fuses on amplifier chassis  
necessary equipment  
input sections:  
• Digital AC Voltmeter  
No. of Inputs: Two Stereo Pairs  
• 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  
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 B with  
complementary bi-polar output stage  
Power Supply: PWM switching type, unregulated  
the nine-step Procedure  
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.  
Rated Power with less than 1% THD (14.4V supply):  
Stereo, all channels driven:  
60W RMS x 4 @ 4 ohms, 80W RMS x 4 @ 2 ohms  
Bridged, all channels driven:  
120W RMS x 2 @ 8 ohms, 160W RMS x 2 @ 4 ohms  
Frequency Response: 10 Hz - 25 kHz +/- 0.5 dB  
3) Turn the “Input Sens.” control all the  
way down.  
Crossover sections:  
Filter Type: 12dB/octave Butterworth  
nom.  
impedance  
target aC voltage  
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) at 3/4 source unit  
volume.  
stereo  
bridged  
31 V  
with continuously variable low-pass cutoff frequency  
selection from 40-150 Hz and high-pass cutoff frequency  
selection from 60Hz - 1.2 kHz.  
15.5 V  
15.5 V  
15.5 V  
14 V  
8Ω  
6Ω  
4Ω  
3Ω  
2Ω  
28 V  
Configurable as Low-Pass or High-Pass. Defeatable.  
25 V  
not recommended  
not recommended  
Preamp output:  
2-Channel, pass-through with unity gain, RCA-type jacks.  
12.5 V  
dimensions (lxwxH):  
15.40" x 9.60" x 2.15" (391 mm x 244 mm x 55 mm)  
7) Connect the AC voltmeter to the speaker output  
connectors of the amplifier. Make sure you test  
the voltage at the correct connectors (+ and –).  
Due to ongoing product development, all specifications are subject to  
change without notice.  
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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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installation notes:  
Use this diagram to document your amplifier’s switch and control positions.  
Channel 1 & 2 Controls  
Pre-Outs  
Amplifier Inputs  
Channel 3 & 4 Controls  
Power  
CH 3&4  
Protect  
Input From  
LEFT  
CH 1 (Left)  
CH 3 (Left)  
Bass Boost  
Bass Boost  
|
1&2 3&4  
High-Level Inputs  
High-Level Inputs  
Off +12dB  
Off +12dB  
40  
Low-Pass  
Filter Frequency (Hz)  
150  
60  
1.2k  
min max  
Input Sens.  
min max  
Input Sens.  
60  
High-Pass  
Filter Frequency (Hz)  
1.2k  
40  
150  
High-Pass  
Low-Pass  
|
|
HP Off LP  
Filter Mode  
|
|
HP Off LP  
Filter Mode  
RIGHT  
CH 2 (Right)  
CH 4 (Right)  
16  
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installation notes:  
installation notes:  
18  
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19  

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