JL Audio Car Amplifier J25001 User Manual

owner’s manual  
500W Monoblock Subwoofer 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.  
 
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ProteCt Your Hearing!  
installation aPPliCations  
Planning Your installation  
We value you as a long-term customer. For  
that reason, we urge you to practice restraint in  
the operation of this product so as not to damage  
your hearing and that of others in your 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 12V, 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  
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 using appropriate  
hardware 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.  
ventilated with the aid of a fan. In normal  
applications, fan-cooling is not necessary.  
stupid mistakes to avoid:  
Check before drilling any holes in your vehicle  
to make sure that you will not be drilling  
through a gas tank, brake line, wiring harness or  
other vital vehicle system.  
Remote Turn-On  
Connector  
(pg. 6)  
+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.  
Serial Number:  
• Protect all system wires from sharp metal  
edges and wear by carefully routing them,  
tying them down and using grommets and  
loom where appropriate.  
Input Sensitivity  
Control  
Bass Boost  
Control  
(pg. 8)  
Left & Right  
Preamp Output Jacks  
(pg. 8)  
Output Polarity  
Switch  
(pg. 7)  
(pg. 6)  
Filter  
Frequency Selector  
(pg. 7)  
Remote  
Level Port  
(pg. 8)  
Left & Right  
Preamp Input Jacks  
(pg. 6)  
Power/Protection  
• 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.  
Status Indicator  
(pg. 9)  
Preamp  
Amplifier  
Inputs  
Outputs  
Remote  
Level  
LEFT  
LEFT  
Port  
Power  
|
Reversed Normal  
Output Polarity  
40  
130  
Off +12dB  
Bass Boost  
min max  
Input Sens.  
LP Filter Frequency (Hz)  
RIGHT  
RIGHT  
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ProduCt desCriPtion  
Power ConneCtions  
The JL Audio J2-500.1 is a monoblock  
subwoofer amplifier utilizing Class B  
technology. Its frequency response is limited  
to the range below 125 Hz. It is not designed  
for driving midrange speakers or tweeters.  
It has been optimized for low-frequency  
amplification. For detailed specifications,  
please refer to Appendix B (page 11).  
5) Run speaker wire 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 minimum 4 AWG power wire, no longer  
than 36 inches (90 cm) from the amplifier to  
the ground connection point. In some vehicles,  
it may be necessary to upgrade the battery  
ground wire. (See page 5 for important notice).  
7) Securely mount the amplifier using  
appropriate hardware.  
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 person 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.  
+ 12VDC  
Remote  
Ground  
5A  
Many vehicles employ small (10 AWG -  
tYPiCal installation sequenCe  
The following represents the sequence  
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 (or larger) when installing a J2-500.1.  
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.  
8) Connect the positive and negative power  
wires to the amplifier.  
9) Connect the remote turn-on wire  
to the amplifier.  
The J2-500.1’s “+12 VDC” (positive) and  
Ground” (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 J2-500.1 with other  
amplifiers and wish to use a single main power  
wire, use 2 AWG or 1/0 AWG main power wire  
(depending on the overall current demands of  
all the amplifiers in the system). This 2 AWG  
or 1/0 AWG power wire should terminate into  
a distribution block mounted as close to the  
amplifiers as possible and should connect to the  
J2-500.1 with 4 AWG power wire.  
Fuse requirements  
10) Connect the RCA input cables  
While the J2-500.1 has four 15A 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 J2-500.1 is being run from that power  
wire, we recommend a 60A fuse be used. AFS or  
MAXI-type fuses are recommended.  
to the amplifier.  
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  
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 (60A for a single J2-500.1)  
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.  
AWG power wire if additional amplifiers  
are being installed with the J2-500.1.  
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.).  
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 (RCA cables) and remote  
turn-on wire from the source unit to the  
amplifier mounting location.  
FUSES  
16) Enjoy the fruits of your labor with your  
favorite music.  
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  
J2-500.1. 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.  
15A  
15A  
15A  
15A  
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“remote” turn-on  
“amPliFier inPuts”  
“inPut sensitiVitY” (gain) adJustment  
Located next to the input connectors is a rotary  
control labeled “Input Sens.”. This rotary control  
can be used to match the source unit’s output  
voltage to the input stage of the amplifier for  
maximum clean output.  
“lP Filter” (CrossoVer) Control  
The J2-500.1 is turned on and off  
using a conventional +12V remote turn-  
on lead, typically controlled by the  
source unit’s remote turn-on output.  
The J2-500.1 only offers low-level (preamp  
level) input connections via a single pair of RCA-  
type jacks that are compatible with a wide range  
of aftermarket source units and processors. If you  
wish to use speaker level signals, you will need to  
employ a line-output converter (not included).  
The J2-500.1 employs a 12dB/octave low-pass  
(LP) 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.  
The low-pass filter in the J2-500.1 is fully  
variable between 40 Hz and 130 Hz via the “LP  
Filter Frequency” control knob. The 12 o’clock  
position corresponds to 80 Hz, and is a good  
starting point for system tuning.  
+ 12VDC  
Remote  
Ground  
mp  
uts  
Amplifier  
Inputs  
ower  
T
LEFT  
40  
min max  
Input Sens.  
LP Filter Fr  
Rev  
Ou  
T
RIGHT  
40  
130  
LP Filter Frequency (Hz)  
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.  
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 12) in this manual. After using this  
procedure, you can then adjust the level of the  
amplifier by adjusting the input sensitivity  
downward, if the amplifier requires attenuation to  
achieve the desired system balance.  
Do not increase the “Input Sens.” setting for  
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.  
You may run a stereo or a mono signal into  
the inputs of the amplifier. The amplifier’s input  
section automatically sums stereo signals to mono  
for the internal amplifier section.  
The amplifier will operate with only one  
“outPut PolaritY” Control  
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  
into the RCA jacks, we recommend that you use  
a “Y-adaptor” to split the mono signal into both  
the Left and Right inputs of the amplifier.  
The J2-500.1 includes a switch to quickly reverse  
the polarity of its audio output. This is very useful  
for establishing a smooth transition between the  
subwoofers and main speaker systems. Choose  
the position that results in the strongest midbass  
and the best “up-front” bass presence.  
If you plan to use the preamp outputs 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.  
er  
Pow  
|
Reversed Normal  
Output Polarity  
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“PreamP outPuts”  
remote leVel Control  
sPeaKer outPut  
“Power” indiCator led /  
The J2-500.1 incorporates a preamp output  
section, designed to make multiple amplifier  
systems easy to set up. This section consists  
of a pair of RCA-type jacks marked  
“Preamp Outputs”.  
The J2-500.1 includes a remote level control  
that can be mounted in the front of the vehicle.  
This control allows the owner to adjust the overall  
subwoofer level to taste. To connect the remote  
bass control knob, insert its plug into the jack  
labeled “Remote Level Port” on the amplifier  
and route the cable and control to the desired  
location in the front of the vehicle.  
Speaker connection to the J2-500.1 is  
straightforward and takes place at the far right  
of the power/speaker connection panel. A  
single positive (“+”) connection and a single  
negative (“”) connection are available via a  
connector labeled “Speaker Output (Mono)”.  
ProteCtion CirCuitrY  
The multi-color “Power” LED on the J2-500.1  
also serves as a status indicator for certain fault  
conditions. Its operation is as follows:  
1) Red: Amplifer is turning on.  
2) Green: Amplifier is on / operating normally.  
Preamp  
Outputs  
3) Yellow: Protection mode activated due to one  
of the following: Shorted outputs, too low of a  
load impedance or thermal overload (too hot).  
LEFT  
P
O
Remote  
Level  
Port  
40  
130  
Off +12dB  
Bass Boost  
Once the fault condition is corrected, the  
amplifier will return to normal operating  
mode and the LED will turn green again. For  
information on troubleshooting this amplifier,  
refer to Appendix C (pages 12, 13).  
LP Filter Frequency (Hz)  
RIGHT  
The Preamp outputs deliver the same signal that  
is being fed to the inputs. (If the input signal are  
full-range, the preamp outputs will be full-range).  
This signal is not affected by the bass boost or LP  
FIlter processing selected for the amplifier.  
Power  
Speaker loads below 2Ω nominal are not  
recommended and will cause the amplifier to  
enter into a protection mode.  
Care should be taken to securely mount this  
control in a manner that does not interfere with  
vehicle operation.  
When setting the amplifier’s input sensitivity,  
the Remote Level Control should be unplugged or  
at full clockwise rotation (maximum level).  
Do not chassis ground any speakers connected  
to this or any other JL Audio amplifier. Doing so  
will cause the amplifier to go into protection.  
To connect the speaker wires to the amplifier,  
strip 1/2-inch (12 mm) of insulation from  
each speaker wire and insert them into their  
appropriate connector (observing correct  
polarity). Then, tighten each connector using a  
Phillips screwdriver.  
“bass boost” Control  
serViCing Your Jl audio amPliFier  
If your amplifier fails or malfunctions, please  
return it to your authorized JL Audio dealer so  
that it may be sent in to JL Audio for service.  
There are no user serviceable parts or fuses inside  
the amplifier. The unique nature of the circuitry  
in the JL Audio amplifiers requires specifically  
trained service personnel. Do not attempt  
to service the amplifier yourself or through  
unauthorized repair facilities. This will not only  
void the warranty, but may result in the creation  
of more problems within the amplifier.  
The J2-500.1 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.  
Do NOT attempt to “bridge” two J2-500.1’s  
together or combine their output to a single  
load in any manner. Doing so will damage the  
amplifier(s).  
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.  
Off +12dB  
Bass Boost  
Before reconnecting the battery ground and  
turning the system on, verify that all control  
settings on the amplifier are set according to  
the needs of the system.  
Jl audio technical support:  
(954) 443-1100  
9:00 AM – 5:30 PM (Eastern Time Zone)  
Monday - Friday  
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JL Audio®  
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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.  
J2-500.1 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: ANL at battery, 4x 15A ATC  
fuses on amplifier chassis.  
necessary equipment  
input section:  
• Digital AC Voltmeter  
Low-Level Input: Single-ended with RCA jacks  
• 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 Input Range: 200mV - 4V 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 Monaural with  
complementary bi-polar outputs  
Power Supply: PWM switching type, unregulated  
Rated Power with less than 1% THD (14.4V supply):  
340W RMS x 1 @ 4Ω  
the nine-step Procedure  
1) Disconnect the speaker(s) from the  
amplifier’s speaker output connectors.  
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.  
420W RMS x 1 @ 3Ω  
500W RMS x 1 @ 2Ω  
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).  
Frequency Response: 10 - 100 Hz (+/– 1 dB)  
Crossover section:  
Low-Pass Filter: 12 dB/octave with continuously variable  
cutoff frequency selection from 40 - 130 Hz. Non-defeatable.  
3) Turn the “Input Sens.” control all the  
way down.  
Preamp outputs:  
2-Channel, pass-through with unity gain, RCA-type jacks.  
nom. impedance  
target aC Voltage  
4Ω  
3Ω  
2Ω  
37 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.  
35.5 V  
31.5 V  
bass boost:  
Single-band with 45 Hz center frequency, adjustable from  
0 to +12dB.  
remote level Control:  
Via included, wired remote control knob. Full mute to  
0 dB range.  
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.  
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):  
13.20" x 9.60" x 2.15" (335 mm x 244 mm x 55 mm)  
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 Appendix A (page 10) to set 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 “+12VDC” wire  
to the “Remote” terminal 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.  
Preamp  
Amplifier  
Inputs  
Outputs  
Remote  
LEFT  
LEFT  
Level  
Port  
Power  
|
Reversed Normal  
Output Polarity  
40  
130  
Oꢀ +12dB  
Bass Boost  
min max  
Input Sens.  
LP Filter Frequency (Hz)  
RIGHT  
RIGHT  
14  
JL Audio®  
 
15  
J2_500_1_MAN_CH.indd 14-15  
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