Soundstream Technologies 404s User Manual

SERIES AND PARALLEL WIRING

2-4 ohm drivers in parallel

= 2 ohms

REFERENCE

404s

4/3/2 Channel

Power Amplifier

OWNERS MANUAL

AND

2-4 ohm drivers in series

= 8 ohms

SOUNDSTREAM TECHNOLOGIES

120 Blue Ravine Road  Folsom  California 95630 USA

ph 916.351.1288  fax [phone]

rev A - 4.25.96

20

4-4 ohm drivers in parallel

=1 ohm

INSTALLATION GUIDE

1

CONGRATULATIONS!

You now own the REFERENCE404s Amplifier, the product of an
uncompromising design and engineering philosophy. Your
Soundstream REFERENCE404s amplifier will outperform any other
amplifier in the world.

To maximize the performance 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 of 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 ______________________________________
Installation Date ______________________________________

Your Soundstream REFERENCE404s amplifier is protected by a limited
warranty. Please read the enclosed warranty card.

SPECIFICATIONS

REFERENCE404s

SERVICE

POWER

Watts

THD <0.1%
Signal to Noise >100 dB
Frequency Response 20 Hz to 20 kHz ± 0.5 dB

Stereo Separation >90 dB
Damping >200

4 Ω Ω Stereo

(8 Ω Ω Bridged)

50 x 4 75 x 4 100 x 4 100 x 4

2 Ω Ω Stereo

(4 Ω Ω Bridged)

1 Ω Ω Stereo

(2 Ω Ω Bridged)

1/2 Ω Ω Stereo

(1 Ω Ω Bridged)

CAUTION!

Prolonged listening at high levels may result in hearing loss. Even
though your new Soundstream REFERENCE404s amplifier sounds
better than anything you’ve ever heard, exercise caution to prevent

hearing damage.

2

Input Sensitivity 200 mV - 5.0 V
Input Impedance

12 kΩ

Dimensions

W x D x H:

13.0” x 9.8” x 2.25”

19

PROTECTION CIRCUITRY

Your REFERENCE404s amplifier is protected against both overheating and
short circuits by means of the following circuits:

• Auto High Current™ power supply

• Main power supply fuses

• Circuit breaker on each channel

• Smart Power Supply Thermal Rollback activating at 85°C

• A fail-safe thermal protection circuit activating at 95°C.

Your amplifier also incorporates an innovative Fault Diagnosis system that
identifies a blown power supply fuse.

NOTE: If you experience blown main power supply fuses, DO NOT increase
values beyond the original fuse value! Doing so will void your warranty and

TROUBLESHOOTING

PROBLEM CAUSE

No sound and LEDs
are not lit

Fault LED is lit
Repeatedly blown

amp fuse, frequent
activation of Smart
Power Supply Circuit

• no power or ground at amp

• no remote turn-on signal

• blown fuse near battery

• amp power supply fuse is blown or missing

• speaker or leads may be shorted

• verify adequate amplifier ventilation

TABLE OF CONTENTS

Design Features .................................................................4 - 5

REFERENCE404s Diagram ...............................................6 - 7

Auto High Current™ Power Supply ......................................... 8

Selecting Input Modes ............................................................. 9

Wiring (with Diagram) .....................................................10 - 11

Installation and Mounting ...................................................... 12

Level Setting ......................................................................... 13

System Installation Diagrams ..........................................14 -17

Protection Circuitry ................................................................ 18

Troubleshooting .................................................................... 18

Service .................................................................................. 19

Specifications ........................................................................ 19

Channels 1,2,3 or 4
experiencing inter­mittent output

No output from
channels 3 & 4 with
1 pair of RCA inputs

• activation of the internal circuit breakers.

• check to make sure channels 1-4 are driving a

1/2 ohm per channel load or greater

• speaker or leads may be shorted

• Select "Internal from ch's 1 & 2" on Ch 3 & 4

input on the bottom of the amplifier. (see
pages 14 - 17)

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