Quantum Audio Stereo Amplifier QS1500D User Guide

MOSFET POWER AMPLIFIERS  
Installation Instructions / Owner's Manual  
QS1500D QS2150 QS2250  
QS4150 QS4250  
Tel : 956-428-4263 Fax : 956-421-4513  
 
SAFETY PRECAUTIONS  
Fuse amplifiers power wire at the battery.  
Be sure to fuse the power wire within 12” of the car's battery. This will protect the car's  
battery in case of a short circuit between the power amplifier and battery. THIS IS A  
MUST, the amplifier's built-in fuse will only protect the power amplifier not the car's  
battery!  
Usehighgradewireconnectors.  
To ensure maximum power transfer and secure safe connections, it is recommended to  
use high grade barrier spades (for connection at amplifier) and terminal rings (for  
connectionatbattery).  
Do not run any wires underneath vehicle.  
Exposed wires have a chance of being cut or damaged. It is best to run all wires through  
the vehicle under the carpet and/or side panels. This lends to a cleaner installation and  
lessriskofdamage.  
Usecautionwhenmountingamplifier.  
Remember there are many electrical 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  
amplifiertoavoidpuncturinglines, shortingwiresordrillingholesinthegastank.  
Runsignalwiresawayfromelectricalwires.  
To avoid possibility of induced noise from the car's electrical system (i.e. popping noises  
orenginenoise), runwiresawayfromthecar'selectricalwiring.  
Make all ground wires as short as possible and at the same point.  
In order to reduce the chance of ground loops (i.e. engine noise), make the grounding  
wire as short as possible to reduce the wire's resistance. Also, when using multiple  
components, makesureallunitsaregroundedat the same point.  
Avoidsharpedgeswhenrunningthewires.  
To avoid the possibility of power, signal or speaker shorts, be careful not to allow the  
amplifier’s wires to come in contact with sharp edges. Use a grommet to protect the wire  
when running through the fire wall .  
2
 
FEATURES AND BENEFITS  
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  
speakers from direct current.  
Short Circuit Protection  
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,  
thenbackon. Theamplifierwillresetandplayagain.  
Thermal Protection  
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  
operatingtemperature.  
Power / Protect Indicator  
The power L.E.D. Illuminates green when the amplifier is on and receiving power. The  
protect LED Illuminatesredwhentheamplifierhasgoneintoprotectionmode.  
Built-inCrossover  
The Solar Series amplifiers include a built-in variable **high and low pass crossovers.  
The crossover features a variable frequency selection (30Hz ~ 250Hz Low Pass and  
60Hz ~ 1.2kHz High Pass ) for precise high or low pass filtering. **Except QS1500D  
whichhasa 40~150Hzlowpassfilter.  
BassEQ  
For added low frequency performance the amplifiers are equipped with 0~12dB bass  
boost @ 45Hz.  
Stable To 2 Ohm Stereo Mode  
The QS2150, QS2250, QS4150 and QS4250 are stable down to 2 ohms in stereo mode  
and4ohmsinbridgedmode. TheQS1500D isstableto2ohms mono.  
3
 
LineOut  
One set of full range line outputs have been provided for convenient connection to  
additionalamplifiersinthesystem.  
Power Fusing  
This protects the amplifier against short circuits and excessive current.  
Remote Turn-on  
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  
headunitinordertoresetprotectioncircuits.  
Adjustable Input Sensitivity  
Allows you to fine-tune the level matching between your source and the power amplifier.  
4
 
MOUNTING LOCATION  
Before you start the installation, it will be necessary to find a mounting location for the  
amplifier. 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.  
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  
theamplifier.  
BASS  
+
-
GND  
-
+
LEVEL  
HPF  
LPF  
X-OVER  
full hpf  
EQ  
R
L
ch3 ch4  
lpf  
HI  
INPUT  
ch1 ch2  
2
3
4
5v .2v  
5v .2v  
0dB 12dB  
60Hz 1.2KHz 30Hz 250Hz  
60Hz 1.2KHz 30Hz 250Hz  
full hpf  
ch3-4 ch1-2  
LINE INPUT  
lpf  
0dB 12dB  
MODE  
+
-
GND  
-
+
OUTPUT  
5
 
POWER CONNECTIONS  
POWER INPUT  
FUSE  
SPEAKER OUTPUT  
R
L
POWER  
PROTECT  
GND REM  
BRIDGED  
+12V  
RADIO'SS REMOTE  
TURN-ONN OUTPUT  
IN-LINE PPOWERR FUSE  
MOUNTED WWITHIIN 12"  
FROM BBATTERYY RECOMMMMENDED  
(NOT PROOVIDED)  
-
+
94.7  
CAR BAATTERY  
+12V  
IMPORTANT! Before making any connections, disconnect the car’s battery until the  
installation is completed to avoid possible damage to the electrical system.  
Connecttheamplifiertothecar'sbattery.  
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 recommend 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  
and crimp on a barrier spade connect to the terminal on the amplifier marked “+12V”.  
Loosen screw terminal and connect barrier spade and tighten (QS1500D uses bare wire  
connection). Use caution to make sure no stray wire stands 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  
protecttheelectricalsystemandamplifieragainstshortcircuitsand/orpowersurges.  
Connectthegroundterminaloftheamplifiertothecar'schassis.  
For the ground connection, use a 4 to 8 gauge wire (black) to connect to the terminal  
marked “GND” 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.  
Connecttheremoteterminaloftheamplifiertoaswitchable+12Vsource.  
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 “REM” (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  
PowerAntennawire.  
6
 
SIGNAL & SPEAKER CONNECTIONS  
Connect the RCA output of the head unit (AM/FM cassette player, CD, or DAT) to  
theRCAinputterminalsoftheamplifier.  
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). Please note that when making these connections the signal inputs  
correspond with the speaker outputs.  
QS2150 & QS2250 CONNECTIONS (STEREO MODE)  
In this example we have selected  
HPF (High Pass Filter) for our XOVER.  
Adjust the HPF (High Pass Frequency)  
Set the “MODE” switch  
to desired crossover point for your speakers  
to the STEREO position.  
+ - GND - +  
line  
lpf  
L
HI  
INPUT  
MONO  
STEREO  
L
full hpf  
.2v  
0dB 12dB 60Hz  
30Hz 250Hz  
5v  
1.2KHz  
LEVEL  
BASS  
EQ  
HPF  
LPF  
X-over Mode  
R
R
output input  
L
R
Optional full range line out connection  
to additional amplifiers in the system.  
POWER INPUT  
FUSE  
SPEAKER OUTPUT  
R
L
POWER  
PROTECT  
GND REM  
BRIDGED  
+12V  
-
-
+
+
4 Ohm Sppeakers  
(2 Ohm Miinimum)  
7
 
QS2150 & QS2250 CONNECTIONS (MONO MODE)  
In this example we have selected  
LPF (Low Pass Filter) for our XOVER.  
Adjust the LPF (Low Pass Frequency)  
Set the “MODE” switch  
to desired crossover point for your speakers  
to the MONO position.  
+ - GND - +  
line  
lpf  
L
HI  
INPUT  
MONO  
full hpf  
STEREO  
L
5v .2v  
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz  
BASS HPF LPF  
LEVEL  
X-over Mode  
R
R
EQ  
output input  
L
R
Optional full range line out connection  
to additional amplifiers in the system.  
POWER INPUT  
FUSE  
SPEAKER OUTPUT  
R
L
POWER  
PROTECT  
GND REM  
BRIDGED  
+12V  
-
+
4 Ohm Sppeaker  
8
 
QS4150 & QS4250 CONNECTIONS (4 CHANNEL MODE)  
In this example we have selected  
HPF (High Pass Filter) for our XOVER.  
Adjust the HPF (High Pass Frequency)  
to desired crossover point for your speakers  
Set the “MODE” switch  
to the 4 channel position.  
BASS  
+ - GND - + LEVEL  
HPF  
LPF  
X-OVER  
full hpf  
EQ  
R
L
ch3 ch4  
lpf  
R
HI  
INPUT  
ch1 ch2  
2 3 4  
5v .2v  
0dB 12dB  
60Hz 1.2KHz 30Hz 250Hz  
60Hz 1.2KHz 30Hz 250Hz  
full hpf  
L
ch3-4 ch1-2  
LINE INPUT  
lpf  
5v .2v  
0dB 12dB  
MODE  
+ - GND - +  
OUTPUT  
Optional full range line out connection  
to additional amplifiers in the system.  
L
R
R
L
CH1-2 SPEAKER OUTPUT  
CH3-4 SPEAKER OUTPUT  
POWER INPUT  
FUSE  
POWER  
PROTECT  
R
R
L
L
BRIDGED  
GND REM  
BRIDGED  
+12V  
-
-
-
+
-
+
+
+
4 Ohm Sppeakers  
(2 Ohm Miinimum)  
4 Ohm Sppeakers  
(2 Ohm Miinimum)  
9
 
QS4150 & QS4250 CONNECTIONS (3 CHANNEL MODE)  
Adjust the LPF (Low Pass Frequency)  
to desired crossover point for your subwoofer  
In this example we have selected  
HPF (High Pass Filter) for our front channels.  
In this example we have selected  
LPF (Low Pass Filter) for our bridged channel.  
Adjust the HPF (High Pass Frequency)  
to desired crossover point for your speakers  
Set the “MODE” switch  
to the 3 channel position.  
BASS  
EQ  
+ - GND - + LEVEL  
HPF  
LPF  
X-OVER  
full hpf  
R
ch3 ch4  
lpf  
R
HI  
INPUT  
ch1 ch2  
2 3 4  
5v .2v  
0dB 12dB  
0dB 12dB  
60Hz 1.2KHz 30Hz 250Hz  
60Hz 1.2KHz 30Hz 250Hz  
full hpf  
L
L
ch3-4 ch1-2  
LINE INPUT  
lpf  
5v .2v  
MODE  
+ - GND - +  
OUTPUT  
Optional full range line out connection  
to additional amplifiers in the system.  
R
L
L
R
CH1-2 SPEAKER OUTPUT  
CH3-4 SPEAKER OUTPUT  
POWER INPUT  
FUSE  
POWER  
PROTECT  
R
R
L
L
BRIDGED  
GND REM  
BRIDGED  
+12V  
-
-
+
-
+
+
4 Ohm Sppeakers  
(2 Ohm Miinimum)  
4 Ohm Sppeaker  
**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 possibly cause permanent damage  
totheamplifier!  
10  
 
QS4150 & QS4250 CONNECTIONS (2 CHANNEL MODE)  
In this example we have selected  
LPF (Low Pass Filter) for our XOVER.  
Adjust the LPF (Low Pass Frequency)  
to desired crossover point for your speakers  
Set the “MODE” switch  
to the 2 channel position.  
BASS  
+ - GND - + LEVEL  
HPF  
LPF  
X-OVER  
full hpf  
EQ  
R
L
ch3 ch4  
lpf  
R
HI  
INPUT  
ch1 ch2  
2 3 4  
5v .2v  
0dB 12dB  
60Hz 1.2KHz 30Hz 250Hz  
60Hz 1.2KHz 30Hz 250Hz  
full hpf  
L
ch3-4 ch1-2  
LINE INPUT  
lpf  
5v .2v  
0dB 12dB  
MODE  
+ - GND - +  
OUTPUT  
Optional full range line out connection  
to additional amplifiers in the system.  
L
R
CH1-2 SPEAKER OUTPUT  
CH3-4 SPEAKER OUTPUT  
POWER INPUT  
FUSE  
POWER  
PROTECT  
R
R
L
L
BRIDGED  
GND REM  
BRIDGED  
+12V  
-
+
-
+
4 Ohm Sppeaker  
4 Ohm Sppeaker  
**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 possibly cause permanent damage  
totheamplifier!  
11  
 
QS1500D CONNECTIONS  
OUTPUT INPUT  
BASS  
BOOST  
SUB  
SONIC  
LOW  
PASS  
LEVEL  
POWER  
L
L
PROTECT  
REMOTE  
CONTROL  
0dB 12dB  
15Hz 55Hz  
40Hz 150Hz  
5v .2v  
R
R
L
R
Optional full range line out connection  
to additional amplifiers in the system.  
GND REM  
FUSE  
SPEAKER OUTPUT  
+12V  
+
+
POWER INPUT  
+
-
4 Ohm Sppeaker  
GND REM  
FUSE  
SPEAKER OUTPUT  
+12V  
+
+
POWER INPUT  
+
-
4 Ohm Sppeaker  
+
-
4 Ohm Sppeaker  
12  
 
HIGH LEVEL CONNECTIONS (OPTIONAL)  
High Level inputs have been included to connect the amplifier to a radio without low-level  
outputs (i.e. factory radio). This connection will allow you to connect directly to the  
speakeroutputoftheradiowithouttheneedofanexternaladapter.  
Determine the type of radio you have and make one of the following connections.  
CAUTION! Before making any connections determine the type of radio to avoid possible  
damage to amplifier and/or radio.  
+ - GND - +  
line  
lpf  
L
HI  
INPUT  
MONO  
STEREO  
full hpf  
5v .2v  
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz  
BASS HPF LPF  
LEVEL  
X-over Mode  
R
EQ  
output input  
94.7  
LEFT +  
LEFT -  
(NOT UUSED)  
GRAY  
BROWN  
BLACK  
GREEN  
WHITE  
RIGHT -  
RIGHT +  
TWO CHANNEL CONNECTIONS:  
FLOATING GROUND RADIO (MOST COMMON TYPE)  
+ - GND - +  
line  
lpf  
L
HI  
INPUT  
MONO  
STEREO  
full hpf  
5v .2v  
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz  
BASS HPF LPF  
LEVEL  
X-over Mode  
R
EQ  
output input  
94.7  
GRAY LEFT +  
BROWN NOT USED  
BLACK GROUND  
GREEN  
WHITE  
NOT USED  
RIGHT +  
TWO CHANNEL CONNECTIONS:  
COMMON GROUND RADIO  
13  
 
BASS  
EQ  
+ - GND - + LEVEL  
HPF  
LPF  
X-OVER  
full hpf  
R
L
ch3 ch4  
lpf  
HI  
INPUT  
ch1 ch2  
2 3 4  
5v .2v  
0dB 12dB  
0dB 12dB  
60Hz 1.2KHz 30Hz 250Hz  
60Hz 1.2KHz 30Hz 250Hz  
full hpf  
ch3-4 ch1-2  
LINE INPUT  
lpf  
5v .2v  
MODE  
+ - GND - +  
OUTPUT  
94.7  
RIGHT +  
RIGHT -  
(NOT UUSED)  
WHITE  
GREEN  
GRAY  
RIGHT +  
RIGHT -  
(NOT UUSED)  
BROWN  
BLACK (GGROUND)  
BLACK (GGROUND)  
BROWN  
GREEN  
WHITE  
LEFT -  
LEFT +  
LEFT -  
LEFT +  
GRAY  
FOUR CHANNEL CONNECTIONS:  
FLOATING GROUND RADIO (MOST COMMON TYPE)  
BASS  
+ - GND - + LEVEL  
HPF  
LPF  
X-OVER  
full hpf  
EQ  
R
L
ch3 ch4  
lpf  
HI  
INPUT  
ch1 ch2  
2 3 4  
5v .2v  
0dB 12dB  
60Hz 1.2KHz 30Hz 250Hz  
60Hz 1.2KHz 30Hz 250Hz  
full hpf  
ch3-4 ch1-2  
LINE INPUT  
lpf  
5v .2v  
0dB 12dB  
MODE  
+ - GND - +  
OUTPUT  
94.7  
RIGHT +  
(NOT UUSED)  
WHITE  
GREEN  
BLACK  
GRAY  
BROWN  
BLACK  
GREEN  
WHITE  
RIGHT +  
(NOT UUSED)  
GROUND  
GROUND  
(NOT UUSED)  
(NOT UUSED)  
BROWN  
GRAY  
LEFT +  
LEFT +  
FOUR CHANNEL CONNECTIONS:  
COMMON GROUND RADIO (MOST COMMON TYPE)  
14  
 
REMOTE BASS CONTROL MODULE (QS1500D)  
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  
theremotetotheamplifierawayfromthecar'selectricalwiring.  
OUTPUT INPUT  
BASS  
BOOST  
SUB  
SONIC  
LOW  
PASS  
LEVEL  
POWER  
L
PROTECT  
REMOTE  
CONROL  
0dB 12dB  
15Hz 55Hz  
40Hz 150Hz  
5v 0.2v  
R
Subsonic Filter - On the QS1500D a subsonic filter has been  
provided to filter out unwanted subsonic bass frequencies  
below the audible range of the subwoofer . This feature helps  
to improve the amplifiers overall performance since power  
is not wasted reproducing frequencies beyond the speakers  
operating range. This feature works in conjunction with the  
Low-pass crossover to provide band-pass filtering.  
15  
 
ADJUSTING THE CROSSOVER AND BASS  
.
The SOLAR series amplifiers are equipped with a built-in variable crossover network  
allowing you to select the crossover type (i.e. Low-Pass or High-Pass) 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 crossover point  
should be determined by the speakers operating range. Please refer to speaker  
manufactures recommended crossover point.  
In this example we have selected  
LPF (Low Pass Filter) for our XOVER.  
Bass Boost @ 45Hz  
0 ~ 12dB  
Adjust the LPF (Low Pass Frequency)  
to desired crossover point for your speakers  
+ - GND - +  
line  
lpf  
L
HI  
INPUT  
MONO  
STEREO  
full hpf  
5v .2v  
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz  
BASS HPF LPF  
LEVEL  
X-over Mode  
R
EQ  
output input  
FINE TUNE THE SYSTEM  
Fine tune the amplifier's input sensitivity.  
The input gain sensitivity control for the “Solar 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  
5v .2v  
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  
distortionatabout3/4ofthevolumecontrol.  
Todetermineiftheamplifier’sgainissetproperly, turnthesystemonandslowlyincrease  
the volume control. You should be able to use about 3/4 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 speakers. If you are unable to achieve 3/4 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  
gaincontrolswhileyoulistenfordistortion.  
16  
 
TROUBLE SHOOTING THE SYSTEM  
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.  
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.  
LOOK FOR....  
SOLUTION  
No Output  
Blown fuse  
Bad RCA Cable(s)  
+12V at power terminal  
+12V at remote terminal  
Grounding point clean and tight  
Head Unit's fader not in center position  
Replace  
Replace  
Check connection  
Check connection  
Check for ground w/meter  
Set to center position  
Low Output  
Check level adjustments  
Bad RCA cable(s)  
Improper level matching  
Re-adjust  
Replace  
Re-adjust  
Engine Noise  
Grounding points are clean and tight  
Check for ground w/meter  
Ground at same point  
Change for better ground  
Replace  
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  
Rejects inducted noise  
Fix and/or replace  
Red Protection L.E.D. Illuminated  
Speaker short  
Check speakers connection  
for short circuit  
Speaker grounding out  
Impedance too low  
Overheating  
Make sure speaker wires  
do not touch chassis ground  
Check speaker impedance  
(Min 2 ohm Stereo, 4 Mono)  
Check mounting location  
for Adequate air Circulation  
Speaker impedance too low  
17  
 
SPECIFICATIONS  
QS2150  
400W  
QS2250  
800W  
QS4150  
800W  
Dynamic Power  
Output Power @ 14.4 VDC :  
4 ohm  
2 ohm  
2 x 150W  
2 x 200W  
1 x 400W  
2 x 250W  
2 x 400W  
1 x 800W  
4 x 150W  
4 x 200W  
2 x 400W  
Bridged 4 ohm  
Frequency Response  
S/N Ratio (A-weight)  
THD with 80k filter  
Low Input Level  
Battery Voltage Range  
Crossover Type  
Low Pass Crossover Frequency  
High Pass Crossover Frequency  
Crossover Slope  
20Hz-28KHz  
>95dB  
<0.05%  
200mV-5V  
11VDC-14.4VDC  
HPF/FULL/LPF  
30Hz-250Hz  
60Hz-1.2kHz  
12dB/Oct  
20Hz-28KHz  
>95dB  
<0.05%  
200mV-5V  
11VDC-14.4VDC  
HPF/FULL/LPF  
30Hz-250Hz  
60Hz-1.2kHz  
12dB/Oct  
20Hz-28KHz  
>95dB  
<0.05%  
200mV-5V  
11VDC-14.4VDC  
HPF/FULL/LPF  
30Hz-250Hz  
60Hz-1.2kHz  
12dB/Oct  
Bass EQ  
Subsonic Filter  
Amplifier Fuse & Holder  
Size (L x W x H)  
0-12dB@45Hz  
N/A  
1 x 30A  
0-12dB@45Hz  
N/A  
2 x 30A  
0-12dB@45Hz  
N/A  
2 x 20A  
1
7 7/8” x 9 1/2” x 2 1/8”  
12 5/8”x 9 1/2” x 2 1/8”  
12 5/8”x 9 /2” x 21 /8”  
QS4250  
1600W  
QS1500D  
1500W  
Dynamic Power  
Output Power @ 14.4 VDC :  
4 ohm  
2 ohm  
4 x 250W  
4 x 400W  
2 x 800W  
1 x 750W  
1 x 1500W  
----  
Bridged 4 ohm  
Frequency Response  
S/N Ratio (A-weight)  
THD with 80k filter  
Low Input Level  
Battery Voltage Range  
Crossover Type  
Low Pass Crossover Frequency  
High Pass Crossover Frequency  
Crossover Slope  
Bass EQ  
Subsonic Filter  
20Hz-28KHz  
>95dB  
<0.05%  
200mV-5V  
11VDC-14.4VDC  
HPF/FULL/LPF  
30Hz-250Hz  
60Hz-1.2kHz  
12dB/Oct  
20Hz-150Hz  
>95dB  
<0.05%  
200mV-5V  
11VDC-14.4VDC  
LP  
40Hz-150Hz  
-----  
12dB/Oct  
0-12dB@45Hz  
15Hz-55Hz  
4 x 25A  
0-12dB@45Hz  
N/A  
2 x 30A  
Amplifier Fuse & Holder  
Size (L x W x H)  
153/4”x 9 1/2” x 2 1/8”  
157/8”x 9 1/2” x 2 1/8”  
Due to continuing product improvement, specifications subject to change without notice.  
18  
 
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 one (1) year. This warranty applies to the original  
purchaseonly.  
Quantum Audio will either repair or replace (as its option) any  
unit that has been found to be defective and under warranty provided the  
defectoccurswithintheone(1)yearwarrantyperiod.  
This limited warranty does not extent to units that have been  
subjected to misuse, abuse, neglect, or accident. In Quantum Audio's  
judgment, products that show 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 visit  
our web site at www.quantumaudio.net for more details.  
Tel : 956-428-4263 Fax : 956-421-4513  
SOLAR AMP REV 1.17.05  
 

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