REFERENCE 705
5/3 Channel
Power Amplifier
OWNERS MANUAL AND INSTALLATION GUIDE
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CONGRATULATIONS!
You now own the REFERENCE705 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.
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 Reference705 sounds better than anything you’ve ever heard, exercise caution to prevent hearing
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TABLE OF CONTENTS |
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Features ......................................................................................................................... |
4 - 5 |
REFERENCE Power Supply Design.................................................................................... |
6 |
Setting High Power/High Current......................................................................................... |
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Selecting Crossover Modes ................................................................................................. |
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Selecting Input Modes ......................................................................................................... |
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Setting Coherent Stereo/Bridged Mono ............................................................................... |
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Wiring (with Diagram) ........................................................................................................ |
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Installation and Mounting................................................................................................... |
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Level Setting...................................................................................................................... |
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Crossover Adjustments...................................................................................................... |
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LSE.Q Subwoofer Equalization Circuitry ........................................................................... |
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Sample Systems......................................................................................................... |
14 - 17 |
Protection Circuitry & Troubleshooting .............................................................................. |
18 |
Service............................................................................................................................... |
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Specifications .................................................................................................................... |
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Reference705
Handcrafted in the U.S.A. |
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MONO |
MONO |
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+12v GND REMOTE |
LSE.Q |
X-OVER LEVEL |
INPUTS |
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X-OVER |
LEVEL |
INPUTS |
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X-OVER LEVEL |
INPUTS |
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Fault |
-ONE+ |
-TWO+ |
+ L - - R + |
+ L - - R + |
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L |
R |
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1K-4K |
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L |
R |
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L |
R |
High Power |
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0.7-2.8 |
17-60 |
30-60 |
2.5-0.04 |
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240-960 |
60-240 |
2.5-0.1 |
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60-240 |
2.5-0.1 |
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High Current |
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Q |
Hz |
Hz |
VOLTS |
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Hz |
Hz |
VOLTS |
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HP |
VOLTS |
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BOOST |
FREQ |
LP |
SUBWOOFER |
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(3-WAY) |
HP CHANNELS 1 + 2 |
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CHANNELS 3 + 4 |
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* |
In 3 -W A Y xo v e r m o d e , C H 1 & |
2 b e c o m e H IG H PA SS, C H 3 & |
4 b e c o m e |
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BA N D PA SS. |
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SUB C H A N N E L |
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( N O N - BR ID G E A BLE ) |
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6 0- 2 40H z |
1- 4 KHz |
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2 4 0 -960 Hz |
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C H 1 |
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6 0 - 240H z |
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BO TH SW ITC H ES SH O U LD BE IN |
TH E SA M E PO SITIO N |
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M ID |
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H IG H PA SS |
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STER E O |
( 1 - 4 KH z ) |
3 - W A Y * |
6 0 - 2 4 0 H z |
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D E - |
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IN P U T E M P H A S IS |
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X O V E R |
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X O V E R |
S E LE C T |
R E A R FILL |
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7 KH z L P |
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6 d B/O c t |
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+ L - |
- R + |
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+ L - |
- R + |
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C A U T IO N : D O |
N O T SW ITC H W H E N |
A M PL IF IE R IS TUR N E D |
O N . |
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SU B C H A N N E L |
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H IG H C U R R E N T |
H IG H P O W ER |
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U SE R IG H T C H A N N E L IN PU TS F O R |
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BR ID G IN G C H A N N ELS 1 - 4 . |
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U se H IG H C U R R E N T f o r SU B C H A N N EL lo a d s a t o r b e lo w 1 o h m . |
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C H A N N E L S 1 - 4 |
S P E A K E R C O N N EC TIO N |
D IA G R A M |
SU B C H A N N E L |
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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.
∙High Power/High Current Capability (subwoofer channel only) - Soundstream’s exclusive circuitry permits customization of your amplifier to its particular application— High Current, for ultra-low impedance loads (multiple subwoofers, less than 1 ohm) or High Power, for higher impedance loads (1 ohm and up).
∙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 directly sandwiched between the circuit board and the heatsink in a design called ChassisinkTM to ensure cool, efficient amplifier operation.
∙Staggered Asymmetrical Electronic Crossover - Continuously variable 2 or 3-way crossovers with 12 dB/octave high pass and 24 dB/octave subwoofer low pass. In 3-way mode, bandpass can be selected for midrange or midbass.
∙Rear Channel De-emphasis - A circuit based on theater surround technology in which rear fill information is rolled off at 6 dB/octave with a -3 dB point at 7,000 Hz to provide a more realistic
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listening experience (in 5 channel mode only).
∙PowerGrid Power Supply Design - All power supply components are located near one another, for the shortest possible current path and are 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 - 24 miniature “stiffening” capacitors ensure rapid power delivery for dynamic peaks. Multiple small input power capacitors are used to provide a lower ESR (Equivalent Series Resistance), which means more power, faster.
∙Smart Thermal Rollback - Most amplifiers shut off when they get too hot. In the unlikely event the Reference705 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.
∙Unregulated Power Supply - 4 ohm power ratings are measured at 12 volts, which means substantially greater output in the real world when the vehicle is running, where voltages range from 13.6 to 14.4 volts. Dynamic capability of the unregulated power supply is vastly greater than that of a tightly regulated power supply.
∙Fault Monitor LED on the front panel notifies you of a blown power supply fuse.
∙1/2 Ohm Subwoofer Drive Ability - The Reference705 subwoofer channel is designed to be stable into any impedance, down to 1/2 ohm.
∙Six Dual Discrete Class A Drive Stages - Over six times the drive current of most amps, which guarantees maximum performance into any load.
∙Drive DelayTM Muted Turn-on/off Circuit - A unique circuit which completely eliminates amplifierrelated turn-on/off noises.
∙Flexible Input Sensitivity accepts voltages from 100 mV (40 mV on the subwoofer channel) to 2.5 V, which permits maximum output from the amplifier with virtually any source unit.
∙Balanced Input Design for added immunity to noise caused by component and vehicle electrical system interaction.
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REFERENCE POWER SUPPLY DESIGN
The Reference705 employs an extremely efficient unregulated pulse-width modulated power supply. Like the rest of the REFERENCE amplifiers from Soundstream, the Reference705 is rated at 12 volts but is designed to take advantage of the additional voltage available when the vehicle is running. The two major advantages of the unregulated power supply are:
∙awesome dynamic power capabilities
∙added continuous power with higher voltages (see chart below)
Because of the dynamic properties of most music, all audio components should be able to react accordingly. Thanks to its unregulated power supply, the Reference705 can comfortably exceed its rated power for dynamic portions of the music.
4 Ohm Sub Channel Watts
14.4 volts
12 volts
0 50 100 150 200 250
4 ohm Power
200 watts x 1 @ 12 volts
250 watts x 1 @ 14.4 volts
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