Soundstream Reference Series 644S Installation Manual
24
SERIES AND PARALLEL WIRING
2-4 ohm drivers in parallel
= 2 ohms
2-4 ohm drivers in series
= 8 ohms
4-4 ohm drivers in parallel
=1 ohm
SOUNDSTREAM TECHNOLOGIES
120 Blue Ravine Road Folsom California 95630 USA
ph 916.351.1288 fax 916.351.0414
rev A - 5.20.96
1
REFERENCE
644s
4/3/2 Channel
Power Amplifier
OWNERS MANUAL
AND
INSTALLATION GUIDE
2
CONGRATULATIONS!
You now own the REFERENCE644s Amplifier, the product of an
uncompromising design and engineering philosophy. Your
Soundstream REFERENCE 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 ______________________________________
CAUTION!
Prolonged listening at high levels may result in hearing loss. Even
though your new Soundstream REFERENCE644s amplifier sounds
better than anything you’ve ever heard, exercise caution to prevent
hearing damage.
23
PROTECTION CIRCUITRY
Your REFERENCE644s amplifier is protected against both overheating and
short circuits by means of the following circuits:
• Main power supply fuses
• Auto High Current™ power supply
• 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
SPECIFICATIONS
THD
<0.1%
Signal to Noise
>100 dB
Frequency Response
20 Hz to 20 kHz ± 0.5 dB
Stereo Separation
>90 dB
Damping
>200
Input Sensitivity
200mV - 2.0V, or 500mV to 5.0V
Input Impedance
10K ohms
Crossover Output
340 mV output w/ 200 mV input (+4.5
dB)
Crossover Specifications
Low Pass: 30 - 120 Hz at 24 dB/Octave
High Pass: 60 - 240 Hz at 12 dB/Octave
Dimensions (W x D x H)
REFERENCE644s: 16.5” x 9.8” x 2.25”
POWER
4 Ω Stereo
(8 Ω Bridged)
(12 Vdc)
2 Ω Stereo
(4 Ω Bridged)
1 Ω Stereo
(2 Ω Bridged)
1/2 Ω Stereo
(1 Ω Bridged)
Watts
75 x 4
(150 x 2)
150 x 4
(300 x 2)
160 x 4
(320 x 2)
160 x 4
(320 x 2)
NOTE: If you experience blown main power supply fuses, it is likely that the
amplifier is seeing a dead short, either in the speaker wire or in the speaker
itself. Rectify the problem before blowing multiple fuses! DO NOT increase
values beyond the original fuse value! Doing so will void your warranty and
22
TROUBLESHOOTING
PROBLEM CAUSE
No sound and power LED is not lit
• No power or ground at amp
• No remote turn-on signal
• Blown fuse near battery
No sound, a power LED is lit, and
the AIRBASS™ option has not
been added.
• No signal input
• The AIRBASS™ switch is in the
"IN" position. Move it to the
"OUT" position
Fault LED is lit
• Amp power supply fuse is blown
or missing
Repeatedly blown amp fuse, frequent activation of Smart Power
Supply Circuit
• Speaker or leads may be shorted
• Verify adequate amplifier ventila-
tion
Not enough input sensitivity while
using the Balanced input
• Be sure both Left and Right Input
Signal Switches are set to the
"BAL" position
Left and Right Input Overload indicators lighting
• Input signal level is too high - readjust input gains, or select the
0.5-5V input signal level range
Alternator whine while using Unbalanced RCA inputs
• Make sure the channel 2 Input
Signal Switch is in the "UNBAL"
position.
• Try the Input Signal Switch for
channels 1, 3 & 4 in the "BAL"
position; leave the switches in
the quietest position. This will
not affect the performance of the
amplifier.
SERVICE
Your Soundstream REFERENCE644s amplifier is protected by a limited
3
TABLE OF CONTENTS
Design Features .................................................................4 - 5
Reference644s Diagram ....................................................6 - 7
High Power / Auto High Current™ Power Supply Design ....... 8
Selecting Input Modes ............................................................. 9
Balanced / Unbalanced Input ................................................ 10
Wiring & Wiring Diagram ................................................ 11 - 12
Installation and Mounting ...................................................... 13
Level Setting ......................................................................... 14
Crossover Adjustments ......................................................... 15
AIRBASS™ ........................................................................... 15
Sample Systems ..............................................................16-21
Troubleshooting .................................................................... 22
Service .................................................................................. 22
Protection Circuitry ................................................................ 23
Specifications ................................................................ ....... 23
4
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.
• Auto High Current™ - Soundstream’s newest exclusive circuit which
automatically customizes your amplifier to its particular application—
High Current, low impedance loads (multiple subwoofers, less than 2
ohms mono) or High Power, higher impedance loads (2 ohms mono
and up).
• Coherent StereoTM/Mixed Mono selection for either “pure” stereo
operation or mixed mono for simultaneous stereo and mono.
• ChassisinkTM Darlington Power Array - Soundstream’s
“overbuilding” of the output section incorporates multiple output
transistors instead of a few for faster, stronger power delivery. The
transistors are sandwiched between the circuit board and the heatsink
in a design called ChassisinkTM 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 it, 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 out faster.
• Smart Thermal Rollback - Most amplifiers shut off when they get too
hot. In the unlikely event the REFERENCE644s amplifier reaches
85° C, it will gradually roll back its average power (without affecting
the dynamics). Once the amplifier has cooled off, it returns to full
power output. If overheating should continue, a second thermal
sensing protection circuit will shut off the amplifier if the heatsink
reaches 95° C.
• Fault Monitor LED on the top panel notifies you of blown power
supply fuses.
• 1/2 ohm Drive Ability - The REFERENCE644s amplifier is designed
21
SAMPLE SYSTEM #6
2 channels of RCA input
2 bridged channels of high pass output
RCA line output set to low pass
Line output to an external amplifier driving subwoofers
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