Boss Audio Systems Car Amplifier CX2500D User Manual

U S E R ’ S M A N U A L  
page  
CONTENTS  
Introduction  
CLASS D MonoBlock  
Car Audio Amplifiers  
CX3500D  
CX2500D  
2
2
3
3
3
3
4
5
5
6
6
7
Features  
Congratulations on your  
purchase of a  
CHAOS EXXTREME Class D  
Amplifier.  
What is included?  
General precautions  
Installation precautions  
Mounting the amplifier  
Connecting the amplifier  
Important system considerations  
Tips for a safe system  
Low level input wiring  
Speaker wiring  
It has been designed, engineered  
and manufactured to bring you  
the highest level of performance  
and quality, and will afford you  
years of listening pleasure.  
Thank you for making  
your choice for car audio  
entertainment!  
Power connections  
Normal and with Stiffening Capacitor  
8
Bridging two CHAOS EXXTREME  
CLASS D Amplifiers  
10 Troubleshooting  
11 Specifications  
CX2500D • CX3500D Amplifier User’s Manual - page 1  
 
• If there is smoke or any peculiar odor  
present during use or if there is damage  
to any of the component enclosures,  
immediately unplug the power cord  
and send the amplifier to your local  
dealer or service center as soon as  
possible .  
What is included?  
When first unpacking your new  
amplifier, please check first that the  
package contains all of the items  
below. If something is missing, contact  
the store where you purchased the  
amplifier.  
• Class D amplifier  
Installation precautions  
Before you drill or cut any holes,  
investigate your car's layout very  
carefully. Take special care when you  
work near the gas tank, fuel lines,  
hydraulic lines and electrical wiring.  
• Remote subwoofer level control  
• Remote subwoofer control cable  
• DataLink cable (for strapping two  
identical CHAOS EXXTREME  
Class D amps together)  
Never operate the amplifier when it is  
unmounted. Attach all audio system  
components securely to prevent  
damage, especially in an accident.  
• Four (4) mounting screws  
Before making or breaking power  
connections in your system, disconnect  
the vehicle battery. Confirm that your  
head unit or other equipment is turned  
off while connecting the input jacks and  
speaker terminals.  
General precautions  
Before installing and using your new  
amplifier, please become fa-  
miliar with all the information con-  
tained in this manual.  
If you need to replace the power fuse,  
replace it only with a fuse identical to  
that supplied with the amplifier. Using  
a fuse of a different type or rating may  
result in damage to your audio system  
or your amplifier which is not covered  
by the manufacturer's warranty.  
Please keep this manual in a safe  
place for future reference.  
• Do not open or attempt to repair this  
unit yourself. Dangerous high voltages  
are present which may result in electric  
shock. Refer any repairs to a qualified  
service technician.  
To avoid risk of electronic shock or  
damage to the amplifier, do not permit  
any of this equipment to become damp  
or wet from water or drinks. If this does  
occur, immediately unplug the power  
wires and send the amplifier to your  
local dealer or service center as soon  
as possible.  
Mounting the amplifier  
1. Find a suitable location in the vehicle  
in which to mount the amplifier.  
2. Make sure there is sufficient air  
circulation around the intended  
mounting location.  
CX2500D • CX3500D Amplifier User’s Manual - page 3  
 
3. Mark the location for the mounting  
hole screws by positioning the amplifier  
where you wish to install it. Use a scribe  
or mounting screw, inserted through  
each of the amp's mounting holes, to  
mark the mounting surface. If the  
mounting surface is carpeted, measure  
the hole centers and mark with a felt  
tip pen.  
4. Check that the fuse holder is empty.  
Then connect the fuse holder to the  
"BATT+" connection on the amplifier.  
5. If multiple amplifiers are being used  
in your system, either:  
• Run a separate pair of cables from  
the battery and a chassis ground point  
to each amplifier. Each (+) cable must  
have its own inline fuse.  
4. Drill pilot holes in the mounting  
surface for the mounting screws. Place  
the amplifier in position, and attach  
the amplifier to the mounting surface  
securely using screws.  
-or-  
• Run a #0 cable from the fuse holder  
at the battery to a distribution block  
at or near the amplifier's location. Then  
run separate cables from the amplifier  
to this distribution block and to  
independent chassis ground points.  
Connecting the amplifier  
Before doing any wiring, look through  
this manual and identify the diagrams  
to follow for power, input and speaker  
connections for your particular  
installation. Be sure you understand  
all the connections before you proceed.  
6. Connect all line inputs and outputs  
(if used) using high-quality cables.  
Connect all speakers, following the  
diagrams in this manual. Be sure to  
observe proper polarity to avoid audio  
phase problems.  
1. Connect the amplifiers power  
ground terminal to the closest point  
on the chassis of the car. Keep this  
ground wire to less than 39" (100 cm)  
in length. Use 4 gauge (or heavier)  
wire.  
7. Insert fuse(s) into the battery fuse  
holder(s).  
8. Recheck all connections before  
powering up the amplifier.  
9. Set all level controls to minimum  
position, and set all crossover  
controls/switches to the desired  
frequency points.  
2. Connect the remote terminal to the  
remote output of the head unit using  
16 gauge (or heavier) wire.  
3. Connect an empty fuse holder within  
18" (45 cm) of the car battery, and run  
4 gauge (or heavier) cable from this  
fuse to the amplifier location.  
10. Power up the head unit and the  
amplifier. Then set the volume control  
on the head unit to about 3/4 volume,  
and adjust the amplifier’s input level  
control(s) to just below the level of  
distortion.  
The purpose of placing a fuse in this  
location is to protect your vehicle’s  
battery in the event that this wire  
accidentally touches the chassis  
ground on its run to the amplifier.  
11. Further fine tuning of the various  
controls may be necessary to obtain  
best results.  
CX2500D • CX3500D Amplifier User’s Manual - page 4  
 
Important installation  
considerations for using  
this amplifier.  
Tips for making your system  
as safe as possible  
When making electrical connections  
to the amplifier, please observe the  
following:  
Your CHAOS EXXTREME Class  
D amplifier is designed to run  
with a minimum load of 1 Ohm.  
• Always use 4GA or heavier wire for  
power and ground connections.  
Operating the CX2500D or  
CX3500D with a speaker im-  
pedance load below 1 Ohm  
may result in poor sound qual-  
ity and damage to the amplifier  
circuitry. Such damage is not  
covered under the warranty  
for this product.  
• Wire the amplifier directly to the car  
battery. Make sure there is circuit  
protection (such as a fuse) on the  
positive power lead within 18” of the  
battery.  
• When making a ground connection,  
always use the shortest possible wire  
to a good chassis ground point.  
The fuse ratings for these amps is  
40A (using two 20A fuses) for the  
CX2500D and 90A (using three 30A  
fuses) for the CX3500D. Although  
sufficient for normal working  
conditions, overloading the amp may  
result in blown fuses. Please try to  
avoid overloading the amp in this  
manner.  
• Wire the remote turn-on connection  
to the remote turn-on lead of your EQ  
or head unit. In some cases, this may  
be the power antenna lead of the head  
unit.  
• Fuses protect BOTH the amplifier  
and the electrical system of your  
vehicle from faulty conditions. If you  
must replace a fuse on the amplifier,  
you must use a fuse of exactly the  
same type and rating. A different type  
of fuse or rating may result in damage  
or cause a fire.  
Don't misuse the  
level control!  
Do not mistake the input level control  
for a volume control! It is designed  
ONLY to match the output level of  
your audio source to the input level  
of your amplifier.  
SHOCK HAZARD! Do not open the case  
of this product. There are dangerous  
voltages present within the unit. There are  
no user-serviceable parts within the unit.  
Do not adjust this input level to  
maximum unless your input level  
requires it.  
Ignoring these instructions will result  
in an input overload to the amplifier,  
and excessive audio distortion. It  
can also cause the protection circuit  
to engage.  
CX2500D • CX3500D Amplifier User’s Manual - page 5  
 
Low Level Input Wiring  
Low-level (RCA) input wiring is preferred for best audio performance. Always use  
a high-quality RCA cable for best audio performance.  
Remote  
Subwoofer Level Control  
SUBSONIC  
FILTER  
LOW PASS  
FILTER  
RIGHT  
BASS  
PHASE  
SENSITIVITY  
LEVEL  
BOOST SELECTOR  
POWER  
PROTECTION  
100mV-2V 2-8V  
MIN  
MAX  
14Hz  
40Hz  
50Hz  
150Hz  
0
+18dB  
180º 0º  
INPUT CONTROLS  
REMOTE  
SUBWOOFER  
LEVEL  
LO
INP
S  
CONTROL  
C L A S S   D   M O N O B L O C K  
P O W E R A M P L I F I E R  
LEFT  
To Audio Outputs of head  
unit or Subwoofer outputs  
of a signal processor  
To Audio Inputs of  
satellite amplifier  
(if present)  
SUBSONIC  
FILTER  
RIGH  
T
L
OW PASS  
BASS  
PHASE  
SENSITIVITY  
LEVEL  
FILTER  
BOOST SELECTOR  
POWER  
PROTECTIO  
N
100mV-2V 2-8V  
MIN  
MAX  
14Hz  
40Hz  
50Hz  
150Hz  
0
+18dB  
1
8
0
º
0
º
INPUT CONTROLS  
REMOT  
E
LOW LEVE  
L
LINE  
OUTS  
SUBWOOFER  
LEVEL  
INPUTS  
CONTROL  
C
P
L
A
SS  
 
D
 
 
MO  
MP  
N
O
F
B
L
O
C
K
LEFT  
O
W
ER  
A
L
I
I
E
R
Speaker Connections  
SPEAKER  
DATA•LINK CONNECTION  
POWER CONNECTIONS  
BATT+  
REMOTE GROUND  
BRIDGED  
MODE  
FUSES  
SLAVE MASTER  
SUBWOOFER  
Speaker  
SPEAKER  
IMPEDANCE  
1-8 OHMS  
+
CX2500D • CX3500D Amplifier User’s Manual - page 6  
 
Power Connections  
Without Stiffening Capacitor  
SPEAKER  
DATA•LINK CONNECTION  
POWER CONNECTIONS  
BATT+  
REMOTE GROUND  
BRIDGED  
MODE  
FUSES  
SLAVE MASTER  
Chassis ground point  
to REMOTE TURN-ON  
terminal of head unit  
FUSE  
Battery  
With Stiffening  
Capacitor  
SPEAKER  
DATA•LINK CONNECTION  
POWER CONNECTIONS  
BATT+  
REMOTE GROUND  
BRIDGED  
MODE  
FUSES  
SLAVE MASTER  
Distribution  
Block  
Chassis  
ground  
point  
Battery  
FUSE  
to REMOTE TURN-ON  
terminal of head unit  
Stiffening  
Capacitor  
Chassis  
ground  
point  
CX2500D • CX3500D Amplifier User’s Manual - page 7  
 
Bridging Two CX2500D or Two CX3500D Amplifiers  
INPUT CONNECTIONS  
(SEE NEXT PAGE FOR POWER, SPEAKER AND DATALINK CONNECTIONS)  
MASTER  
AMPLIFIER  
Front panel  
SUBSONIC  
FILTER  
LOW PASS  
FILTER  
BASS  
PHASE  
RIGHT  
SENSITIVITY  
LEVEL  
BOOST SELECTOR  
POWER  
PROTECTION  
100mV-2V 2-8V  
MIN  
MAX  
14Hz  
40Hz  
50Hz  
LINE  
150Hz  
0
+18dB  
180º 0º  
INPUT CONTROLS  
REMOTE  
SUBWOOFER  
LEVEL  
LOW LEVEL  
IN
OUTS  
CONTROL  
C L A S S   D   M O N O B L O C K  
P O W E R A M P L I F I E R  
LEFT  
Remote Subwoofer  
Level Control  
To Audio Outputs of  
head unit or  
Subwoofer outputs  
of a signal processor  
SLAVE  
AMPLIFIER  
Front Panel  
SUBSONIC  
LOW PASS  
FILTER  
BASS  
PHASE  
RIGHT  
SENSITIVITY  
LEVEL  
FILTER  
BOOST SELECTOR  
POWER  
PROTECTION  
100mV-2V 2-8V  
MIN  
MAX  
14Hz  
40Hz  
50Hz  
LINE  
150Hz  
0
+18dB  
180º 0º  
INPUT CONTROLS  
REMOTE  
SUBWOOFER  
LEVEL  
LOW LEVEL  
INPUTS  
OUTS  
CONTROL  
C L A S S   D   M O N O B L O C K  
P O W E R   A M P L I F I E R  
LEFT  
PLEASE NOTE:  
PLEASE NOTE:  
In this MASTER AMP/SLAVE AMP  
configuration, the Slave amp  
receives its audio signal from the  
Master Amp. Therefore, DO NOT  
USE THE INPUTS ON THE SLAVE  
AMP!  
In this MASTER AMP/SLAVE AMP  
configuration, the Slave amp  
receives its audio signal from the  
Master Amp. Therefore, DO NOT  
USE THE SUBWOOFER LEVEL  
CONTROL ON THE SLAVE AMP!  
CX2500D • CX3500D Amplifier User’s Manual - page 8  
 
Bridging Two CX2500D or Two CX3500D Amplifiers  
POWER AND SPEAKER CONNECTIONS  
(SEE PREVIOUS PAGE FOR INPUT CONNECTIONS)  
BRIDGED  
MODE  
BRIDGED MODE  
SWITCH IN MASTER  
POSITION  
MASTER  
AMPLIFIER  
Rear panel  
SLAVE MASTER  
SPEAKER  
DATA•LINK CONNECTION  
POWER CONNECTIONS  
BATT+  
REMOTE GROUND  
BRIDGED  
MODE  
FUSES  
SLAVE MASTER  
SUBWOOFER  
Speaker  
Chassis  
ground  
point  
SPEAKER  
IMPEDANCE  
2-8 OHMS  
SPEAKER  
DATA•LINK CONNETION  
POWER CONNECTIONS  
BATT+  
REMOTE GROUND  
BRIDGED  
MODE  
FUSES  
SLAVE MASTER  
SLAVE  
AMPLIFIER  
Rear Panel  
Distribution  
Block  
Chassis  
ground  
point  
BRIDGED  
MODE  
Battery  
FUSE  
SLAVE MASTER  
Stiffening  
Capacitor  
BRIDGED MODE  
SWITCH IN SLAVE  
POSITION  
Chassis  
ground  
point  
to REMOTE TURN-ON  
terminal of head unit  
CX2500D • CX3500D Amplifier User’s Manual - page 9  
 
Troubleshooting  
If you experience operation or performance problems with this product, compare your  
installation with the electrical wiring diagram on the previous pages. If problems persist,  
read the following troubleshooting tips which may help eliminate the problems.  
SYMPTOM  
POSSIBLE REMEDY  
Check to make sure you have a good ground connection.  
Check that the Remote Input (Turn-On) has at least 3VDC.  
Check that there is battery power on the (+) terminal.  
Check that there is at least 12v.  
Amplifier will not  
power up.  
Check all fuses, replace if necessary.  
Make sure that the Protection LED is not illuminated. If it is lit, shut off  
the amplifier briefly, and then repower it.  
Check for short circuits on speaker leads.  
Protection LED  
comes on when  
amplifier is  
Turn down the volume control on the head unit to prevent overdriving.  
Remove speaker leads, and reset the amplifier. If the Protection LED still  
comes on, then the amplifier is faulty and needs servicing.  
powered up.  
Check that all fuses are OK.  
No output.  
Check that amplifier is properly grounded.  
Check that the Remote Input (Turn-On) has at least 3VDC.  
Check that the RCA audio cables are plugged into the proper inputs.  
Check all speaker wiring.  
Reset the Level Control.  
Low output.  
Check the Crossover Control settings.  
Check the RCA interconnect cables.  
Check all speaker wiring.  
Audio present in  
only one channel.  
Disconnect all RCA inputs to the amplifiers. If the hiss disappears, then  
plug in the component driving the amplifier and unplug its inputs. If the  
hiss disappears at this point, go on until the faulty/noisy component is  
found.  
High hiss in the  
speakers.  
It is best to set the amplifier's input level control as low as possible. The  
best subjective signal-to-noise ratio is achieved in this manner. Try to set  
the head unit as high as possible (without distortion) and the amp input  
level as low as possible.  
Check for improperly grounded RCA interconnects.  
Squealing noise  
from speakers.  
Check that the Input Level Control is set to match the signal level of the  
head unit. Always try to set the Input Level as low as possible.  
Distorted sound.  
Check that all crossover frequencies are properly set.  
Check for short circuits on the speaker leads.  
Check that the minimum speaker impedance for the amp model is correct.  
Amplifier gets  
very hot.  
Check that there is good air circulation around the amp. In some  
applications, it may be necessary to add and external cooling fan.  
This is usually caused by poor quality RCA cables,which can pick up  
radiated noise. Use only the best quality cables, and route them away  
from power cables.  
Engine noise  
(static type)  
Check that speaker leads are not shorted to the vehicle chassis.  
Check that the RCA grounds are not shorted to the vehicle chassis.  
Check that the head unit is properly grounded.  
Engine noise  
(alternator  
whine)  
CX2500D • CX3500D Amplifier User’s Manual - page 10  
 
Specifications  
CLASS D  
MonoBlock Car Audio  
Amplifier  
CLASS D  
MonoBlock Car Audio  
Amplifier  
MODEL  
CX2500D  
CX3500D  
RMS POWER  
into 4 Ohms  
750W x 1  
1200W x 1  
RMS POWER  
into 2 Ohms  
1200W x 1  
1800W x 1  
2500W x 1  
1 Ohm Mono  
10k Ohm  
1700W x 1  
2200W x 1  
3500W x 1  
1 Ohm Mono  
10k Ohm  
MAX POWER  
into 2 Ohms  
MAX POWER  
into 1 Ohm  
Min. speaker  
impedance  
Input  
impedance  
Input  
sensitivity  
Selectable 100mV-2V or 2V-8V Selectable 100mV-2V or 2V-8V  
Frequency response  
Signal-to-noise ratio  
Hz-150Hz  
Hz-150Hz  
15  
15  
100dB  
100dB  
Crossover/filter range  
low pass  
50Hz-150Hz  
15Hz-40Hz  
50Hz-150Hz  
15Hz-40Hz  
subsonic  
Variable 0 -+18dB  
Selectable 0/180º  
35A x 2  
Variable 0 -+18dB  
Selectable 0/180º  
35A x 3  
Bass Boost  
Phase Shift  
Fuse rating  
12-3/4"  
14-7/8"  
Dimensions:  
(11-7/8" x 2-5/8" x ...)  
All specifications subject to  
change without notice.  
CX2500D • CX3500D Amplifier User’s Manual - page 11  
 

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