Soundstream REFERENCE 300SX Owner's Manual And Installation Manual

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CONGRATULATIONS!

You now own the REFERENCE Amplifier, the product of an
uncompromising design and engineering philosophy. Your

SoLndstream

REFERENCE amplifier will outperform any other amplifier in the world.
To madmize the

pedorrnance

of your system, we recommend that you
thoroughly acquaint yourself with its capabilities and features. Please retain
this manual and your sales and installation receipts for future reference.

Soundstream amplifiers are the result 01 American craftsmanship and

the

highest quality control standards, and when

properly

installed

will

provide
you with many years of listening pleasure. Should your amplifier ever need
service or replacement due to theft, please record the following information,
which will help protect

your

investment.

Model

and Serial #
Dealer’s Name
Date of Purchase
Installation Shop

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DESIGN FEATURES

. Uncompromising Design and Construction - including

mil-spec

glass

epoxy circuit boards and high

current

custom gold-plated solid brass

connections that will accept up to 4 gauge power/ground wire.

. Hlgh PowerRligh Current CapabIlity - Soundstream’s exclusive circuit

which permits customization of your amplifier to its particular
application-high current, low impedance loads (multiple subwoofers, less
than 2 ohms mono) or High Paver, higher impedance loads (2 ohms mono
and up).

. Coherent

StereoTYIMlxed

Mono - selection for either “pure” stereo

operation or mixed mono for simultaneous stereo and mono.

2

Chassisink”

Darlington Power Array -

Soundstream’s

“overbuilding” of

the

output section incorporates multiple

outpul

transislors instead of a few

for faster, stronger power delivery. The transistors

are

sandwiched

between the circuit board and

the heatsink

in a design called

Chassisir&TM

to ensure cool. efficient amplifier operation.

PowerGrid Power Supply Design -

All

power supply components are
located near one another. connected by thick. wide PCB traces. which
ensures rapid, high current delivery. The entire power supply is isolated on
one side of the

circuit

board while the audio

stage

is located opposite if,

guaranteeing minimal noise
Ultra-Low ESR Capacitance Bank-Multiple small input power capacitors

are

used

to provide a lower ESR (Equivalent Series Resistance), which

means more power

in and

auf

faster.

Smart

Thermal

Rollback - Most amplifiers

shut

off when they get too hot.

In the unlikely event the

REFERENCE300sx

amplifier reaches 85” C, it will
gradually roil back its average power (without affecting the dynamics).
Once the amplifier has cooled off, it returns to full power

oulput.

If
overheating should continue, a second thermal sensing protection circuit
will shut off the amplifier if the

heatsink

reaches 95” C.

Unregulated Power Supply 4 ohm power ratings are measured at 12
volts, meaning substantially greater oulpui in the real world when the
vehicle is funning, where voltages range from 13.2 to 14.4 volts.

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Fautl

Monitor LED - on

the

top panel notifies you of blown power supply

fuses.

l

l/2

ohm Drlve

Abiiliy

-The REFERENCE amplifiers are designed to drive

virtually any load-all the way down to

l/2

ohm stereo (1 ohm mono).

l Dual Discrete Class A Drive Stages

.

Over six times the drive current of

most amps, which maintains

perfomlance

into low impedance loads.

l Drive

DelayTH

Muted

Turn-oWofl

Circuit .

A unique circuit which

completely eliminates any amplifier-related

turn-on/off

noises.

l Flexible hput Sensitivity

-

accepts voltages from 200 mV to 5.0 V,

penitling

maximum output from the amplifier with virtually any source.

l Differential Balanced input Design

-

for

added

immunity to noise caused

,by

component and vehicle electrical system interaction when using

\Inbalanced

RCA inputs.

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9.

Kev to Caiiouts

Fault LED - Indicates a blown fuse.
High Power LED - Indicates amplifier power on in “High Power’
mode.
High Current LED - Indicates amplifier power on in “High Current”
mode.

+12V -

Connect to a fuse or circuit breaker, then to the batfery’s

positive post.

GND

-

Main ground connection.

Bolt

to a clean chassis ground in
the vehicle.
REM - Remote turn-on input from the head unit. Accepts

+lZV.

Speaker Output Connections - Left and right channels.
Input Level - independent Left and Right channel input level
controls.
Inputs - Right and left channel RCA (Differential Balanced ) inputs;
only right channel input is used in “Mono” mode.

IO. Main Fuse-Main power supply fuse.

Heplace

only

with

the same

value fuse.

11. Crossover

S.1.P.s

-Crossover frequency settings for the amplifier.

See page 9 for more details.

12. Amplifier Crossover - Select high pass, low pass or full range
amplifier operation.

13. Mixed Mono/Stereo/Bridge - Select “Bridge” for bridged mono
operation (use right channel input). Select “Stereo” for coherent
stereo operation. Select “Mixed Mono’ for simultaneous stereo

I

bridged mono operation.

14. High Power I High Current Switch - Use HIGH CURRENT for

loads at or below 1 ohm stereo (2 ohms mono).

CAUTION: DO

NOT SWITCH WHEN AMPLIFIER IS TURNED ON.

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