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REFERENCE
705s
5/3 Channel
Power Amplifier
OWNERS MANUAL AND
INSTALLATION GUIDE
1
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CONGRATULATIONS! You now own the REFERENCE705s 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 thorou ghly acquaint yourself with its capabilities and features. Please retain this manual and your sales and installation receipts f or future reference. Soundstream amplifiers are the result of American
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TABLE OF CONTENTS Features ................................ ................................ ................................ .............. 4 - 5 ................................ ................................ ................ 6 - 7 REFERENCE Power Supply Design ................................ ................................ ........ 8 Setting High Power/High Current ................................ ................................ ............. 9 Selecting Crossover Modes
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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 t o 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 applicat ion — High Current, for ultra - low impedance loads (multiple subwoofers, less than 1 ohm) or High Power, for h
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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. TM •Drive Delay Muted Turn-on/off Circuit - A unique circuit which completely eliminates amplifier - related turn - on/off noises. • Flexible Input Sensitivity accepts voltages from 200 mV (80 mV on the subwoofer channel) to 5.0 V, which permits maximum output from the amplifier with virtually any source
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Reference705s 6
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Key to Callouts 1. Fault LED - 2. High Power LED - 3. High Current LED - Indicates amplifier power on in "High Current" mode. 4. Main Fuse - 5. +12V - 6. GND - 7. REM - - on input from the head unit. Accepts +12V. 8. Speaker Output Connections - 9. LSE.Q - 10. Low Pass Crossover Adjustment Pot - pass filter. 11. Input Level - Subwoofer channel level control. 12. Inputs - 13. Speaker Output Connections - 14. Crossover Adjustment Pots - for the internal high pass fil
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REFERENCE POWER SUPPLY DESIGN The Reference705s employs an extremely efficient unregulated pulse - width modulated power supply. Like the rest of the REFERENCE amplifiers from Soundstream, the Reference705s 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
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INSTALLATION STEP 1 SETTING THE HIGH POWER/HIGH CURRENT SWITCH (applies to subwoofer channel only) The Reference705s’ subwoofer channel can be switched between “High Power” and “High Current” modes. This allows the Reference705s to maximize power and efficiency at impedances ≥ 1 Ohm in “High Power” mode, or down to 1/2 Ohm in “High Current” mode. The circuit operates by selecting a set of power supply voltage rails best suited to your particular application. One is a hi gher v
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INSTALLATION STEP 2 SELECTING THE CROSSOVER MODES The Reference705s incorporates a sophisticated, fully adjustable electronic crossover for each of its two pairs of channels and subwoofer channel. The Reference705s can drive a full system without need of an outboard electronic crossover. Before installing the amplifier, make certain the switches on the bottom are set to the correct positions. After setting the switches, be sure to install the hole plugs included with the amplifier.
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INSTALLATION STEP 3 SELECTING INPUT MODES The Reference705s can be driven with either one, two, or three pairs of stereo inputs. If your source unit has front and rear outputs, you can take advantage of its fading capability by driving the Reference705s in 5 channel mode with two pairs of inputs . When operated in the 5 channel mode with 2 pairs of inputs, the lowpass subwoofer channel will operate in a non - fading mode — i t derives its signal from th e front and rear inputs. After
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INSTALLATION STEP 4 COHERENT STEREO™ / BRIDGED MONO The stereo channels of the Reference705s have the ability to operate in either of the following Coherent Stereo with identical left and right stereo channels for maximum fidelity. Bridged Mono for dedicated single channel operation; ideal for using the R eference705s in 3 - channel operation. It is also used when large amounts of power are necessary for single speakers. In bridged mono, only the right channel input (per pair of
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WIRING (continued) CIRCUIT BREAKERS/FUSES EXTERNAL Like all car audio amplifiers, the Reference705s must be protected with a fuse or circuit breaker located within 18” of the batt ery. This will prevent a fire in the event of a shorted cable. The value of the circuit breaker or fuse should be between 60 and 80 amps. INTERNAL The Reference705s is fused on its front panel with a 40 amp Maxi - fuse. In the event of a blown power supply fuse, the “Fault” i ndicator on the front panel wi
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INSTALLATION STEP 6 INSTALLATION AND MOUNTING 1. AMPLIFIER LOCATION TM The Reference705s employs highly efficient circuitry and Soundstream's unique Chassisink design to maintain lower operating temperatures. Additional cooling may be required if the amplifier is located in an area wit h poor air flow, or when driving especially low impedance loads at extremely high levels. When mounting the amplifier, it should be securely mounted to either a panel in the vehicle or an amp board o
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INSTALLATION STEP 7 LEVEL SETTING The input levels are adjusted by means of the input level controls located on the front of the amplifier. This is a unique dual - stage circuit that adjusts both level and gain. This topology maintains better Signal to Noise ratio s even with low output sources. In the ideal situation, all components in the audio system reach maximum undistorted output at the same time. The reason is bec ause an amplifier will only make what comes into it bigger.
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INSTALLATION STEP 8 CROSSOVER ADJUSTMENTS In most car audio ins tallations, there is a tendency for a “midbass boom.” Because of their interior dimensions, most cars will resonate or ring at these midbass frequencies. If we design the system so there is less musical information in this region, the final response is v ery smooth and natural sounding. The Reference705s incorporates a continuously variable staggered asymmetrical electronic cross over. The high and low pass portions of t
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INSTALLATION STEP 9 LSE.Q THEORY AND USE LSE.Q is a proprietary subwoofer control circuit included with the Reference705s amplifier. It is capable of both removing subsonic energy in program material and providing a variable boost at low frequencie The circuit consists of two controls. One adjusts the frequency of operation, and the other adjusts the range of boost. With both controls adjusted fully counter - clockwise, no boost is applied and the amplifier is flat in response down
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SAMPLE SYSTEM #1 2-way front to rear fade with constant bass 4 channels of input 4 channels of 2-way high pass, sub channel in low pass 18
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SAMPLE SYSTEM #2 3-way with midrange bandpass 2 channels of input 2 channels of tweeter high pass, 2 channels of midrange 19
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SAMPLE SYSTEM #3 3-way with midbass bandpass and subwoofer to midbass/satellite fading 4 channels of input 2 channels of midbass bandpass, 2 channels of high pass, sub channel in low pass (High Current; < 1 Ohm) 20
