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