Quantum Audio QS4250, QS2150, QS2250, QS4150, QS1500D User Manual

MOSFET POWER AMPLIFIERS

Installation Instructions / Owner's Manual

QS1500D QS2150 QS2250

QS4150 QS4250

Tel : [phone] Fax : [phone]

www.quantumaudio.net

INTRODUCTION

Congratulations on your purchase of a QUANTUM AUDIO state-of-the-art power
amplifier. Your selection of a QUANTUM AUDIO product indicates a true appreciation of
fine musical reproduction. Whether adding to an existing system or including your
Quantum amplifier in a new system, you are certain to notice immediate performance
benefits.

KEEP YOUR SALES RECEIPT

Take this time to attach your sales receipt to the manual and put in a safe place. In case
of any unforeseen reason this product may need warranty service, your receipt will be
necessary to establish purchase date.

RECOMMENDATION

A power amplifier’s performance is only as good as its installation. Proper installation will
maximize the system’s overall performance. It is recommended that you have our
product installed by an authorized QUANTUM AUDIO retailer. However, if you decide to
install it yourself, please carefully read through this manual and take your time to do a
quality installation.

Due to continuing product improvements and possible manual revisions, we recommend
checking our website for latest product information at www.quantumaudio.net.

IMPORTANT! Before making any connections, disconnect the car’s battery until
the installation is completed to avoid possible damage to the electrical system.

WARNING!

WARNING!

Exposure to high power sound system can cause hearing loss or damage.

Exposure to high power sound system can cause hearing loss or damage.

Listening to your system at loud levels while driving, will impair your ability to

Listening to your system at loud levels while driving, will impair your ability to

hear traffic sounds and emergency vehicles. Use common sense when listening

hear traffic sounds and emergency vehicles. Use common sense when listening

to your system.

to your system.

Serial #

Model #

1

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!

Use high grade wire connectors.

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
connection at battery).

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
less risk of damage.

Use caution when mounting amplifier.

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
amplifier to avoid puncturing lines, shorting wires or drilling holes in the gas tank.

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), run wires away from the car's electrical wiring.

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, make sure all units are grounded at the same point.

Avoid sharp edges when running the wires.

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,
then back on. The amplifier will reset and play again.

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
operating temperature.

Power / Protect Indicator

The power L.E.D. Illuminates green when the amplifier is on and receiving power. The
protect LED Illuminates red when the amplifier has gone into protection mode.

Built-in Crossover

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
which has a 40 ~ 150Hz low pass filter.

Bass EQ

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
and 4 ohms in bridged mode. The QS1500D is stable to 2 ohms mono.

3

Line Out

One set of full range line outputs have been provided for convenient connection to
additional amplifiers in the system.

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
head unit in order to reset protection circuits.

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
the amplifier.

R

L

ch3-4

LINE INPUT

ch1-2

+ - GND - +

ch3

HI

INPUT

ch1

+ - GND - +

LEVEL

ch4

5v

ch2

5v

BASS

EQ

0dB 60Hz 30Hz

12dB

.2v

0dB

12dB

.2v

5

HPF

LPF

X-OVER

full

hpf

lpf

250Hz

1.2KHz

60Hz

30Hz 250Hz

1.2KHz

2 3 4

full

hpf

lpf

MODE

OUTPUT

POWER CONNECTIONS

SPEAKER OUTPUTFUSE

R

BRIDGED

MOUNTED WITHIN 12"

MOUNTED WITHIN 12"

FROM BATTERY RECOMMENDED

FROM BATTERY RECOMMENDED

++

L

IN-LINE POWER FUSE

IN-LINE POWER FUSE

(NOT PROVIDED)(NOT PROVIDED)

RADIO'S REMOTE

RADIO'S REMOTE

TURN-ON OUTPUT

TURN-ON OUTPUT

94.794.7

POWER INPUT

GND REM

+12V

--

CAR BATTERY

CAR BATTERY

+12V

+12V

POWER

PROTECT

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 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
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.

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.

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 “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
Power Antenna wire.

6

SIGNAL & 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.

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

to desired crossover point for your speakers

L

LL

R

RR

output

HPF (High Pass Frequency)

+ - GND - +

line

HI

INPUT

5v

LEVEL

input

.2v

0dB

60Hz

12dB

BASS

EQ

HPF

1.2KHz

30Hz

250Hz

LPF

Set the “MODE” switch

to the STEREO position.

lpf

MONO

full hpf

STEREO

Mode

X-over

Optional full range line out connection
to additional amplifiers in the system.

LL

POWER INPUT

GND REM

RR

+12V

POWER

PROTECT

7

--

++

SPEAKER OUTPUTFUSE

R

L

BRIDGED

4 Ohm Speakers

4 Ohm Speakers

(2 Ohm Minimum)

(2 Ohm Minimum)

--

++

QS2150 & QS2250 CONNECTIONS (MONO MODE)

Adjust the L

to desired crossover point for your speakers

L

LL

R

RR

output

Optional full range line out connection
to additional amplifiers in the system.

PF (Low Pass Frequency)

+ - GND - +

line

HI

INPUT

input

RR

LL

5v

LEVEL

In this example we have selected

LPF (Low Pass Filter) for our XOVER.

Set the “MODE” switch

to the MONO position.

lpf

MONO

full hpf

0dB

60Hz

30Hz

1.2KHz

LPF

250Hz

12dB

.2v

BASS

HPF

EQ

X-over

STEREO

Mode

POWER INPUT

GND REM

+12V

POWER

PROTECT

8

SPEAKER OUTPUTFUSE

R

BRIDGED

++

4 Ohm Speaker4 Ohm Speaker

L

--

QS4150 & QS4250 CONNECTIONS (4 CHANNEL MODE)

In this example we have selected

HPF (High Pass Filter) for our XOVER.

HPF (High Pass Frequency)

Adjust the

to desired crossover point for your speakers

Set the “MODE” switch

to the 4 channel position.

LEVEL

5v

5v

L

.2v

.2v

POWER INPUT

GND REM

--

BASS

HPF

EQ

0dB 60Hz 30Hz

12dB

1.2KHz

60Hz

0dB

12dB

1.2KHz

RR

LL

FUSE

+12V

++

LPF

250Hz

30Hz 250Hz

--

X-OVER

full

hpf

L

OUTPUT

--

RR

LL

++

lpf

2 3 4

full

hpf

lpf

MODE

Optional full range line out connection
to additional amplifiers in the system.

CH3-4 SPEAKER OUTPUT

BRIDGED

++

+ - GND - +

R

L

ch3-4

LINE INPUT

LL

RR

POWER

PROTECT

--

++

ch4

ch3

HI

INPUT

ch1

ch2

ch1-2

+ - GND - +

CH1-2 SPEAKER OUTPUT

R R

BRIDGED

4 Ohm Speakers

4 Ohm Speakers

(2 Ohm Minimum)

(2 Ohm Minimum)

4 Ohm Speakers

4 Ohm Speakers

(2 Ohm Minimum)

(2 Ohm Minimum)

9

QS4150 & QS4250 CONNECTIONS (3 CHANNEL MODE)

In this example we have selected

HPF (High Pass Filter) for our front channels.

HPF (High Pass Frequency)

Adjust the

to desired crossover point for your speakers

+ - GND - +

LEVEL

R

L

ch3-4

LINE INPUT

RR

LL

POWER

PROTECT

ch4

ch3

HI

5v

INPUT

ch1

ch2

ch1-2

CH1-2 SPEAKER OUTPUT

R R

+ - GND - +

BRIDGED

5v

L

BASS

EQ

0dB 60Hz 30Hz

12dB

.2v

0dB

12dB

.2v

RR

LL

POWER INPUT

GND REM

60Hz

+12V

HPF

Adjust the L

to desired crossover point for your subwoofer

LPF

X-OVER

full

250Hz

1.2KHz

1.2KHz

full

30Hz 250Hz

FUSE

PF (Low Pass Frequency)

In this example we have selected

LPF (Low Pass Filter) for our bridged channel.

Set the “MODE” switch

to the 3 channel position.

hpf

lpf

2 3 4

hpf

lpf

MODE

Optional full range line out connection
to additional amplifiers in the system.

CH3-4 SPEAKER OUTPUT

L

BRIDGED

RR

LL

OUTPUT

--

++

(2 Ohm Minimum)

(2 Ohm Minimum)

4 Ohm Speakers

4 Ohm Speakers

--

++

--

++

4 Ohm Speaker4 Ohm Speaker

**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
to the amplifier!

10

QS4150 & QS4250 CONNECTIONS (2 CHANNEL MODE)

In this example we have selected

LPF (Low Pass Filter) for our XOVER.

Adjust the L

to desired crossover point for your speakers

PF (Low Pass Frequency)

Set the “MODE” switch

to the 2 channel position.

R

L

POWER

PROTECT

LEVEL

5v

5v

L

.2v

.2v

POWER INPUT

GND REM

BASS

HPF

EQ

0dB 60Hz 30Hz

12dB

60Hz

0dB

12dB

RR

LL

+12V

+ - GND - +

ch4

ch3

HI

INPUT

ch1

ch3-4

LINE INPUT

ch2

ch1-2

+ - GND - +

CH1-2 SPEAKER OUTPUT

R R

BRIDGED

--

++

4 Ohm Speaker4 Ohm Speaker

1.2KHz

1.2KHz

LPF

30Hz 250Hz

FUSE

X-OVER

full

hpf

lpf

250Hz

2 3 4

full

hpf

lpf

MODE

OUTPUT

Optional full range line out connection
to additional amplifiers in the system.

CH3-4 SPEAKER OUTPUT

L

BRIDGED

--

++

4 Ohm Speaker4 Ohm Speaker

RR

LL

**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
to the amplifier!

11

QS1500D CONNECTIONS

BASS SUB LOW

POWER

PROTECT

Optional full range line out connection
to additional amplifiers in the system.

BOOST SONIC PASS

REMOTE

CONTROL

12dB

+12V

POWER INPUT

OUTPUT INPUT

LEVEL

LL

55Hz

15Hz

40Hz0dB

150Hz

5v

0.2v

RR

FUSEGND REM

SPEAKER OUTPUT

L

R

RR

LL

+ +

--

++

4 Ohm Speaker4 Ohm Speaker

+12V

POWER INPUT

FUSEGND REM

SPEAKER OUTPUT

+ +

--

++

4 Ohm Speaker4 Ohm Speaker

--

++

4 Ohm Speaker4 Ohm Speaker

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
speaker output of the radio with out the need of an external adapter.

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 - +

L

R

output

line

input

HI

INPUT

5v

LEVEL

0dB

60Hz

12dB

.2v

BASS

1.2KHz

HPF

EQ

lpf

MONO

full hpf

X-over

STEREO

Mode

30Hz

250Hz

LPF

94.794.7

GRAYGRAY

BROWNBROWN

BLACKBLACK

(NOT USED)(NOT USED)

GREENGREEN

WHITEWHITE

TWO CHANNEL CONNECTIONS:
FLOATING GROUND RADIO (MOST COMMON TYPE)

+ - GND - +

line

L

R

output

input

HI

INPUT

5v

LEVEL

0dB

60Hz

12dB

.2v

BASS

1.2KHz

HPF

EQ

GRAY LEFT +GRAY LEFT +

BROWN NOT USED BROWN NOT USED

BLACKBLACK

GROUNDGROUND

GREEN NOT USEDGREEN NOT USED

WHITEWHITE

RIGHT +RIGHT +

TWO CHANNEL CONNECTIONS:
COMMON GROUND RADIO

LEFT +LEFT +
LEFT -LEFT -

RIGHT -RIGHT -
RIGHT +RIGHT +

30Hz

LPF

250Hz

94.794.7

lpf

full hpf

X-over

MONO

STEREO

Mode

13

R

L

ch3-4

LINE INPUT

ch1-2

+ - GND - +

ch4

ch3

HI

INPUT

ch1

ch2

+ - GND - +

BASS

LEVEL

0dB 60Hz 30Hz

5v

.2v

0dB

5v

.2v

HPF

LPF

250Hz

30Hz 250Hz

X-OVER

full

hpf

lpf

full

hpf

lpf

2 3 4

MODE

OUTPUT

EQ

12dB

1.2KHz

60Hz

12dB

1.2KHz

94.794.7

GRAYGRAY

BROWNBROWN

BLACK (GROUND)BLACK (GROUND)

GREENGREEN

WHITEWHITE

RIGHT +RIGHT +
RIGHT -RIGHT -

(NOT USED)(NOT USED)
LEFT -LEFT -

LEFT +LEFT +

(NOT USED)(NOT USED)

FOUR CHANNEL CONNECTIONS:
FLOATING GROUND RADIO (MOST COMMON TYPE)

BASS

LEVEL

0dB 60Hz 30Hz

5v

.2v

0dB

5v

.2v

RIGHT +RIGHT +

(NOT USED)(NOT USED)

GROUNDGROUND

(NOT USED)(NOT USED)

LEFT +LEFT +

HPF

EQ

12dB

12dB

LPF

1.2KHz

60Hz

30Hz 250Hz

1.2KHz

94.794.7

R

L

ch3-4

LINE INPUT

ch1-2

GRAYGRAY

BLACKBLACK

WHITEWHITE

+ - GND - +

ch3

INPUT

ch1

+ - GND - +

BROWNBROWN

GREENGREEN

ch4

HI

ch2

RIGHT +RIGHT +
RIGHT -RIGHT -

LEFT -LEFT -
LEFT +LEFT +

X-OVER

full

lpf

250Hz

full

lpf

RIGHT +RIGHT +

(NOT USED)(NOT USED)

GROUNDGROUND

(NOT USED)(NOT USED)
LEFT +LEFT +

WHITEWHITE

GREENGREEN

BLACK (GROUND)BLACK (GROUND)

BROWNBROWN

GRAYGRAY

hpf

2 3 4

hpf

MODE

WHITEWHITE

GREENGREEN

BLACKBLACK

BROWNBROWN

OUTPUT

GRAYGRAY

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
the remote to the amplifier away from the car's electrical wiring.

POWER

PROTECT

BASS SUB LOW

BOOST SONIC PASS

REMOTE

CONTROL

OUTPUT INPUT

LEVEL

55Hz

15Hz

40Hz0dB

12dB

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.

150Hz

5v

0.2v

L

R

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.

Bass Boost @ 45Hz

0 ~ 12dB

to desired crossover point for your speakers

line

L

R

input

output

Adjust the L

+ - GND - +

HI

INPUT

5v

LEVEL

PF (Low Pass Frequency)

0dB

.2v

BASS

In this example we have selected

LPF (Low Pass Filter) for our XOVER.

lpf

60Hz

12dB

1.2KHz

HPF

EQ

full hpf

30Hz

250Hz

LPF

X-over

MONO

STEREO

Mode

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

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
distortion at about 3/4 of the volume control.

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

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 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
gain controls while you listen for distortion.

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 Replace
Bad RCA Cable(s) Replace
+12V at power terminal Check connection
+12V at remote terminal Check connection
Grounding point clean and tight Check for ground w/meter
Head Unit's fader not in center position Set to center position

Low Output

Check level adjustments Re-adjust
Bad RCA cable(s) Replace
Improper level matching Re-adjust

Engine Noise

Grounding points are clean and tight Check for ground w/meter
Ground all components at same point Ground at same point
Try different grounding point Change for better ground
Bad RCA cable(s) Replace
Use High Quality shielded RCA cables Rejects inducted noise
Low Vehicle charging system and/or battery Fix and/or replace

Red Protection L.E.D. Illuminated

Speaker short Check speakers connection

Speaker grounding out Make sure speaker wires

Impedance too low Check speaker impedance

Overheating Check mounting location

for short circuit

do not touch chassis ground

(Min 2 ohm Stereo, 4 Mono)

for Adequate air Circulation
Speaker impedance too low

17

SPECIFICATIONS

Dynamic Power 400W 800W 800W

QS2150 QS2250

Output Power @ 14.4 VDC :

4 ohm 2 x 150W 2 x 250W 4 x 150W
2 ohm 2 x 200W 2 x 400W 4 x 200W

Bridged 4 ohm 1 x 400W 1 x 800W 2 x 400W
Frequency Response 20Hz-28KHz 20Hz-28KHz 20Hz-28KHz
S/N Ratio (A-weight) >95dB >95dB >95dB
THD with 80k filter <0.05% <0.05% <0.05%
Low Input Level 200mV-5V 200mV-5V 200mV-5V
Battery Voltage Range 11VDC-14.4VDC 11VDC-14.4VDC 11VDC-14.4VDC
Crossover Type HPF/FULL/LPF HPF/FULL/LPF HPF/FULL/LPF
Low Pass Crossover Frequency 30Hz-250Hz 30Hz-250Hz 30Hz-250Hz
High Pass Crossover Frequency 60Hz-1.2kHz 60Hz-1.2kHz 60Hz-1.2kHz
Crossover Slope 12dB/Oct 12dB/Oct 12dB/Oct
Bass EQ 0-12dB@45Hz 0-12dB@45Hz 0-12dB@45Hz
Subsonic Filter N/A N/A N/A
Amplifier Fuse & Holder 1 x 30A 2 x 30A 2 x 20A

Size (L x W x H) 7 /

11 511 511

7

” x 9 / ” x 2 / ” 12 / ”x 9 / ” x 2 / ” 12 / ”x 9 / ” x 2 / ”

28 8 28 8 2 8

8

QS4150

Dynamic Power 1600W 1500W

QS4250 QS1500D

Output Power @ 14.4 VDC :

4 ohm 4 x 250W 1 x 750W

2 ohm 4 x 400W 1 x 1500W

Bridged 4 ohm 2 x 800W ---­Frequency Response 20Hz-28KHz 20Hz-150Hz
S/N Ratio (A-weight) >95dB >95dB
THD with 80k filter <0.05% <0.05%
Low Input Level 200mV-5V 200mV-5V
Battery Voltage Range 11VDC-14.4VDC 11VDC-14.4VDC
Crossover Type HPF/FULL/LPF LP
Low Pass Crossover Frequency 30Hz-250Hz 40Hz-150Hz
High Pass Crossover Frequency 60Hz-1.2kHz ----­Crossover Slope 12dB/Oct 12dB/Oct
Bass EQ 0-12dB@45Hz 0-12dB@45Hz
Subsonic Filter N/A 15Hz-55Hz
Amplifier Fuse & Holder 2 x 30A 4 x 25A

Size (L x W x H) 15 / ”x 9 / ” x 2 / ” 15 / ”x 9 / ” x 2 / ”

Due to continuing product improvement, specifications subject to change without notice.

31 1 71 1

4 2 8 8 2 8

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

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 the one (1) year warranty period.

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 : [phone] Fax : [phone]

www.quantumaudio.net

Manual By

www.extremeconcepts.com

SOLAR AMP REV 1.17.05