Quantum Audio Stereo Amplifier QCA4400 User Guide

LIMITED WARRANTY  
QUANTUM AUDIO warrants any products purchased in the  
U.S.A. from an authorized QUANTUM AUDIO dealer. All products are  
warranted to be free from defects in material and workmanship under  
normal use and service for a period of (1) year when the unit is installed  
by an authorized QUANTUM AUDIO dealer. Non-authorized dealer  
installed products carry a one (1) year parts and labor limited warranty.  
This warranty applies to the original purchase only.  
QUANTUM AUDIO will either repair or replace (as its option)  
any unit that has been found to be defective and under warranty  
provided the defect occurs within:  
QCA4400 QCA2500D QCA3500D  
QCA4500D  
One (1) year if purchased through an authorized QUANTUM  
AUDIO dealer.  
COZMIK SERIES AMPLIFIERS  
This limited warranty does not extend to units that have been  
subjected to misuse, abuse, neglect, or accident. Products that in  
QUANTUM AUDIO’s judgment shows evidence of having been altered,  
modified, or serviced without QUANTUM AUDIO’s authorization, will be  
ineligible under this warranty.  
To obtain warranty service please contact your retailer or see  
DB Research L.L.P.  
Instruction Manual  
• Installation Instructions / Owner’s Manual •  
302 Hanmore Industrial Parkway // Harlingen, TX 78550  
®
Due to continuous improvement of the product the Specifications are subject to change without notice.  
 
Line out  
FEATURES AND BENEFITS  
Full range line outputs have been provided for convenient connection to additional  
amplifiers in the system. The outputs are buffered to reduce signal loss. Please note that  
the amplifier’s input level adjusts these level outputs.  
DC Offset Protection  
This circuit protects the output of the amplifier against DC voltage. If for some reason DC  
voltage is detected at the output stage, the amplifier will shut down protecting the speak-  
ers from direct current.  
Power Fusing  
This protects the amplifier against short circuits and excessive current.  
Short Circuit Protection  
Remote Turn-on  
The circuit protects the amplifier from damage due to a short found in the speakers or  
wiring. If one of the speakers or its wiring comes in contact with ground, the amplifier will  
shut down. To resume normal operation, correct the problem and turn the head unit off,  
then back on. The amplifier will reset and play again.  
Automatically turns amplifier on when connected to the head unit’s remote output. The  
amplifier will turn on and off with the head unit to save current consumption. This control  
also operates the reset circuit for the amplifier’s protection. It must be connected with the  
head unit in order to reset protection circuits.  
Thermal Protection  
Adjustable Input Sensitivity  
To protect the amplifier circuitry against damage caused by prolonged exposure to high  
temperatures, a thermal protection circuit is activated if the amplifier reaches excessively  
high operating temperature. Once the thermal circuit is activated, the amplifier will shut  
down to cool off. The amplifier will automatically turn back on once it cools down to a safe  
operating temperature.  
Allows you to fine-tune the level matching between your source and the power amplifier.  
Low Impedance Stability  
Power Indicator  
QCA2500D-1 Ohm Mono  
QCA3500D-1 Ohm Mono  
QCA4500D-1 Ohm Mono  
The diagnostic L.E.D. illuminates when the amplifier is on and receiving power.  
QCA4400-2 Ohm Stereo, 4 Ohm Bridged  
Built-in Crossover  
The “Cozmik Series” amplifiers include a built-in variable crossovers. The crossover  
features a variable frequency selection for precise low pass filtering for the QCA2500D,  
QCA3500D and QCA4500D. The QCA4400 also offers the same frequency selection with  
the option of low or high pass filtering.  
Power and Speaker Distribution Blocks  
Heavy gauge bare wire distribution blocks are provided for maximum power and signal  
transfer with minimal resistance.  
Bass Boost (QCA2500D QCA3500D QCA4500D)  
For added low frequency performance the amplifiers are equipped with a variable *0~18  
dB bass boost @ 45Hz.  
3
4
 
POWER CONNECTIONS  
MOUNTING LOCATION  
(QCA4400 QCA2500D QCA3500D QCA4500D)  
Before you start the installation, it will be necessary to find a mounting location for the ampli-  
fier. Find a location in which the amplifier will receive adequate ventilation in order to  
dissipate the heat it develops during operation. Two popular mounting locations are in the  
trunk or under the seat.  
SPEAKER OUTPUT  
FUSES  
+12V  
REM  
GND  
POWER  
PROTECT  
2500 Watts Dynamic Power  
QCA2500DClass D Monoblock Amplifier  
Select the location in which you wish to mount the amplifier. Use caution when mounting  
amplifier, there are many wires, gas lines, vacuum lines, brake lines as well as a gas tank  
in the automobile. Make sure you know where they are when mounting the amplifier to  
avoid puncturing lines, shorting wires or drilling holes in the gas tank. Once you are ready,  
use a pencil to mark the mounting holes in the bottom panel. After you have marked the  
locations of the holes move amplifier out of the way and drill small starter holes to make the  
tapping screws easier to install. Use provided screws to tighten down the amplifier.  
Turn on Remote  
In-Line Power fuse  
Mounted Within 12”  
From Battery  
-
+
Recommended.  
94.7  
Battery  
+12V  
IMPORTANT! Before making any connections, disconnect the car’s battery until the  
installation is completed to avoid possible damage to the electrical system.  
Connect the amplifier to the car’s battery  
At times, the amplifier will need to draw large levels of current that cannot be provided by  
any circuit in the car’s fuse box. We recommended using a 4 to 8 gauge power wire for your  
connections depending on the amplifier and length of the wire. Strip one end of the wire to  
connect to the terminal on the amplifier marked “batt+”. Loosen screw terminal and  
connect bare wire and tighten. Use caution to make sure no stray wire strands come in  
contact with surrounding terminals causing short circuits. Run the wire directly to the  
positive terminal of the car’s battery. Make sure to use an in-line fuse within 12” of the car’s  
battery to protect the electrical system and amplifier against short circuits and/or power  
surges.  
Connect the ground terminal of the amplifier to the car’s chassis  
4500 Watts Dynamic Power  
QCA4500D  
Class D Monoblock Amplifier  
For the ground connection, use a 4 to 8 gauge wire (black) to connect to the terminal  
marked “ground” and then connect it to the car’s chassis. Try to keep the length of the  
cable as short as possible, preferably less than 6”. Also make sure that the point on the car  
where the connection is to be made is free of paint and dirt.  
Connect the remote terminal of the amplifier to a switchable +12V source  
This connection allows the amplifier to be turned on and off with the power control of the  
radio. If the radio has a REMOTE output terminal, connect it to the amplifier’s terminal  
marked “remote” (using a 16 gauge wire or heavier). Now when the radio is turned on, the  
amplifier will automatically turn on. This connection can also be made to the radio’s Power  
Antenna wire.  
5
6
 
SIGNAL CONNECTIONS  
SPEAKER CONNECTIONS  
Connect the RCA output of the head unit (AM/FM cassette player, CD, or DAT) to the  
RCA input terminals of the amplifier.  
IMPORTANT! The following speaker connection are for the amplifier in normal mono  
configuration.Make the speaker connections using speaker wire that is at least 16  
gauge or heavier.  
To make these connections, we recommend high quality RCA cables, which are available  
at your local car audio retailer. Run signal wires away from electrical wires to avoid  
possibility of induced noise from the car’s electrical system (i.e. popping noises or engine  
noise).  
As with any audio component, proper phasing of the amplifier and speakers is essential for  
strong bass response. When connecting, make sure that positive (+) from the amplifier is  
connected to the positive (+) of the speaker, and the same for negative (-).  
Please note that although the QCA2500D , QCA3500D , QCA4500D are mono amplifiers,  
we have provided two sets of speaker terminals on the amplifier. These terminals are  
connected in paralleled internally (connected together). The second set of speaker terminals  
are intended for ease of connection when running multiple woofers.  
REMOTE  
IN  
OUT  
BASS  
LEVEL  
SUBSONIC  
20Hz 50Hz  
LPF  
BOOST  
MIN MAX  
40Hz 130Hz 0dB  
18dB  
2500 Watts Dynamic Power  
QCA2500DClass D  
Monoblock Amplifier  
L
R
Optional full range line out connection  
to addition addition in the system.  
SPEAKER OUTPUT  
MONO SIGNAL  
CONNECTION  
+12V  
REM  
GND  
POWER  
94.7  
PROTECT  
3500 Watts Dynamic Power  
QCA3500D  
Class D Monoblock Amplifier  
+
-
4 Ohm Speaker  
Ohm minimum)  
INPUT  
FULL  
FULL  
LPF  
HPF  
LEVEL  
LPF  
LEVEL  
HPF  
FREQ  
BASS  
BOOST  
BASS  
FREQ  
BOOST  
X-OVER  
X-OVER  
0dB 18dB 60Hz 400Hz  
FRONT  
MIN MAX  
MIN MAX  
60Hz 400Hz 0dB 18dB  
REAR  
800 Watts Dynamic Power  
QCA4400  
4 Channel Amplifier  
SPEAKER OUTPUT  
+12V  
FUSES  
REM  
GND  
POWER  
PROTECT  
R
L
R
L
SIGNAL CONNECTION:  
4 Channel Amplifier using  
2 pair of RCA inputs.  
94.7  
4500 Watts Dynamic Power  
Class D Monoblock Amplifier  
QCA4500D  
+
-
4 Ohm Speaker  
2 Ohm Speaker (2 Ohm minimum)  
+
-
4 Ohm Speaker  
7
8
 
SPEAKER CONNECTIONS (QCA4400)  
REMOTE BASS CONTROL MODULE (OPTIONAL)  
(QCA2500D QCA3500D QCA4500D)  
Make the speaker connections using speaker wire that is at least 16  
gauge or heavier.  
Before connecting the remote, it will be necessary to find a mounting location that will be  
easy to access for adjustment. Once you select your mounting location, you will need to run  
the control wire from the remote to the amplifier. To avoid possibility of induced noise from  
the car’s electrical system (i.e. popping noises or engine noise), run the cable from the  
remote to the amplifier away from the car’s electrical wiring.  
As with any audio component, proper phasing of the amplifier and speakers is essential for  
strong bass response. When connecting, make sure that positive (+) from the amplifier is  
connected to the positive (+) of the speaker, and the same for negative (-).  
***CAUTION! In the bridged mode, the amplifier must see a 4 Ohm load or higher. Any  
lower than 4 ohms will cause the amplifier to overheat and possible cause permanent  
damage to the amplifier!  
REMOTE  
IN  
OUT  
BASS  
LEVEL  
SUBSONIC  
20Hz 50Hz  
LPF  
BOOST  
SPEAKER OUTPUT  
MIN MAX  
40Hz 130Hz 0dB  
18dB  
FUSES  
+12V  
POWER  
GND  
REM  
Ch4- Ch4+ Ch3- Ch3+ Ch2- Ch2+ Ch1- Ch1+  
4500 Watts Dynamic Power  
QCA4500DClass D Monoblock Amplifier  
PROTECT  
BRIDGE MODE  
BRIDGE MODE  
800 Watts Dynamic Power  
4 Channel Amplifier  
QC4400  
+
-
+
-
4 Ohm Speaker  
4 Ohm Speaker  
SPEAKER OUTPUT  
Ch4- Ch4+ Ch3- Ch3+ Ch2- Ch2+ Ch1- Ch1+  
FUSES  
+12V  
POWER  
GND  
REM  
PROTECT  
BRIDGE MODE  
BRIDGE MODE  
800 Watts Dynamic Power  
4 Channel Amplifier  
QC4400  
+
-
+
-
+
-
+
-
4 Ohm Speaker  
4 Ohm Speaker  
4 Ohm Speaker  
4 Ohm Speaker  
9
10  
 
FINE TUNE THE SYSTEM  
ADJUSTMENTS AND SETTINGS  
The “Cozmik Series” amplifiers are equipped with built-in variable crossover networks  
allowing you to select the crossover mode (i.e. Low-Pass/Full/High-Pass or On/Off) and  
the desired crossover point. For example if you wish to drive a pair of subwoofers, you  
can select the “Low Pass” setting on the amplifier to filter out high frequencies. This will  
send only low frequencies to your subwoofers (see example settings below). The cross-  
over point should be determined by the speakers operating range. Please refer to speaker  
manufactures recommended crossover point.  
Fine tune the amplifier’s input sensitivity  
The gain sensitivity control for the “Platinum Series” amplifier is located on the side panel.  
This gain control has been included to allow adjustment to properly match the output of the  
radio. This is one of the most misunderstood adjustments. By rotating the control in the  
clockwise direction, the amplifier’s input will become more sensitive and the music will play  
louder. This is not a volume control and you will not get more power out of the amplifier in  
the maximum position! It may seem to deliver more output, but actually the system is only  
playing louder faster as you turn the volume control on the radio. Ideally, to properly level  
match the system the goal is to achieve maximum output from the amplifier without  
distortion at about ¾ of the volume control.  
Filter selection for channel 1 & 2  
Filter selection for channel 3 & 4  
Adjust the frequency to the  
desired point for speakers 1 & 2.  
Adjust the frequency to the  
desired point for speakers 3 & 4.  
Bass Boost @ 45Hz  
*0~18dB Channels 1 & 2  
Only in Lowpass  
Bass Boost @ 45Hz  
*0~18dB Channels 3 & 4  
Only in Lowpass  
To determine if the amplifier’s gain is set properly, turn the system on and slowly increase  
the volume control. You should be able to use about ¾ volume before the system gets loud  
but not distorting. It is very important when making these adjustments that you do not over  
drive the speakers (at point of distortion) this will cause permanent damage to the speak-  
ers. If you are unable to achieve ¾ volume before distortion you will need to adjust gain  
control (in this case you would reduce the gain). The gain controls should be adjusted very  
slowly. It may help to have another person to assist you by adjusting the gain controls while  
you listen for distortion.  
INPUT  
FULL  
FULL  
LPF  
FREQ  
HPF  
LEVEL  
LPF  
LEVEL  
HPF  
FREQ  
BASS  
BOOST  
BASS  
BOOST  
X-OVER  
X-OVER  
0dB 18dB 60Hz 400Hz  
FRONT  
MIN MAX  
MIN MAX  
60Hz 400Hz 0dB 18dB  
REAR  
800 Watts Dynamic Power  
4 Channel Amplifier  
QC4400  
Input Level  
Min  
Max  
11  
12  
 
TROUBLE SHOOTING THE SYSTEM  
SPECIFICATIONS  
QCA4400  
We have put together this trouble-shooting guide if you experience problems after  
installing the amplifier. Please keep in mind that the majority of problems incurred are  
caused by improper installation and not the equipment itself. In addition, there are many  
components in the system that could cause various signal problems such as inducted  
electrical noise and engine noise.  
Input Voltage @ 11 - 14.4 VDC:  
2500 watts  
4 x 400 watts  
2 x 1200 watts  
4 x 700 watts  
10Hz-20Khz  
>90dB  
200mV. - 5.8 V  
Hi/Low Pass  
55Hz - 400Hz  
12db per octave  
18dB @ 45Hz  
14.75 x 9.75 x 2.6  
2 x 25 amp  
Dynamic Power  
4 ohm  
4 ohms Bridged  
2 ohm  
Before you can properly address the problem, you must first find the component that is  
causing the problem. This will take patience and a process of elimination.  
Frequency Resp.  
S/N Ratio (A-weight)  
Low Input Level  
Crossover Type  
Crossover Freq. (Lowpass)  
Crossover Slope  
Bass EQ.  
LOOK FOR…..  
No Output  
SOLUTION  
Replace  
Blown fuse  
Bad RCA Cable(s)  
Replace  
Size (L x W x H)  
Fuse Rating  
+12V at power terminal  
+12V at remote terminal  
Grounding point clean and tight  
Head Unit’s fader not in center position  
Master & Slave settings  
Check connection  
Check connection  
Check for ground w/meter  
Set to center position  
Confirm correct setting  
Input Voltage @ 11 - 14.4 VDC:  
QCA2500D  
QCA3500D QCA4500D  
Dynamic Power  
4 ohm  
2500 watts  
1 x 625 watts  
1 x 1500 watts  
1 x 2500 watts  
20Hz - 250Hz  
>90dB  
246mV - 5.9V  
Low Pass  
40Hz - 150Hz  
3500 watts  
1 x 750 watts  
1 x 1750 watts  
1 x 3500 watts  
20Hz - 250Hz  
>90dB  
246mV - 5.9V  
Low Pass  
40Hz - 150Hz  
4500 watts  
1 x 875 watts  
1 x 2250 watts  
1 x 4500 watts  
20Hz - 250Hz  
>90dB  
Low Output  
Check level adjustments  
Bad RCA cable(s)  
Improper level matching  
Master & Slave settings  
Re-adjust  
Replace  
Re-adjust  
Confirm correct setting  
2 ohm  
1 ohm  
Frequency Resp.  
S/N Ratio (A-weight)  
Low Input Level  
Crossover Type  
Crossover Freq. (Lowpass)  
Crossover Slope  
Bass EQ.  
Subsonic Filter  
Remote Control Included  
Fuse Rating  
246mV - 5.9V  
Low Pass  
Engine Noise  
Grounding points are clean and tight  
Ground all components at same point  
Try different grounding point  
Bad RCA cable(s)  
Use High Quality shielded RCA cables  
Low Vehicle charging system and/or battery  
Check for ground w/meter  
Ground at same point  
Change for better ground  
Replace  
Rejects inducted noise  
Fix and/or replace  
40Hz - 150Hz  
18dB per octave  
18dB @ 45Hz  
20Hz - 50Hz  
optional  
18dB per octave 18dB per octave  
18dB @ 45Hz  
20Hz - 50Hz  
optional  
18dB @ 45Hz  
20Hz - 50Hz  
optional  
2 x 20 amp  
2 x 30 amp  
3 x 30 amp  
Red Protection L.E.D. illuminated  
Speaker short  
Check speakers connection  
for short circuit  
Speaker grounding out  
Make sure speaker wires  
Do not touch chassis ground  
Check speaker impedance  
Check mounting location  
for Adequate air circulation  
Impedance too low  
Overheating  
Due to continuous improvment of the product the specifications are subject to change without notice.  
13  
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