Soundstream Technologies 705s manual

1 REFERENCE 705s 5/3 Channel Power Amplifier OWNERS MANUAL AND INS TALLATION GUIDE[...]

2 CONGR ATULATIONS! 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. P[...]

3 TABLE OF CONTENTS Features .............................................................................................................. 4 - 5 REFERENCE705s Diagram ................................................................................ 6 - 7 REFERENCE Power Supply Design .................................................................[...]

4 DESIGN FE ATURES • 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 [...]

5 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 Delay TM Muted Turn - on/off Circuit - A unique circuit which completely eliminates amplifier - related turn - on/off noises. • Flexible Input Se[...]

6 Reference705s[...]

7 Key to Callouts 1. Fault LED - Indicates a blown fuse. 2. High Power LED - Indicates amplifier power on in "High Power" mode. 3. High Current LED - Indicates amplifier power on in "High Current" mode. 4. Main Fuse - Main power supply fuse. 5. +12V - Connected to a fuse or circuit breaker, then to the battery's positive po[...]

8 4 Ohm Sub Channel Watts 12 volts 14.4 volts 0 50 100 150 200 250 REFERENCE POWER SUPP LY 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 vo[...]

9 INS TA LL ATION 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 ?[...]

10 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 s[...]

11 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 lowp[...]

12 INS TA LL ATION STEP 5 WIRING POWER AND GROUND To assure maximum output from the Reference705s, use high quality, low - loss power and ground cables. The Reference705s will accept up to 4 gauge power and gr ound cables, which is the only size recommended. For system examples and diagrams, see pages 18 - 21. COHERENT STEREO™ / BRIDGED MONO The [...]

13 WIRING DIAGRAM 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. INTER NAL Th[...]

14 INS TALLATION AND MOUNTING 1. AMPLIFIER LOCATION The Reference705s employs highly efficient circuitry and Soundstream's unique Chassisink TM 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 extreme[...]

15 INS TA LL ATION 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 a[...]

16 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 Referen[...]

17 INS TA LL ATION 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 s. The circuit consists of two controls. One adjusts the frequency of operation, and the other [...]

18 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[...]

19 SAMPLE SYSTEM #2 3 - way with midrange bandpass 2 channels of input 2 channels of tweeter high pass, 2 channels of midrange[...]

20 SAMPLE SYSTEM #3 3 - way with midbass bandpass and subwoofer to midbass/satellite fading 4 channels of input 2 channels of midbass bandp ass, 2 channels of high pass, sub channel in low pass (High Current; < 1 Ohm)[...]

21 SAMPLE SYSTEM #4 2 - way in 3 channel mode with fading bass 4 channels of input 2 channels of bridged high pass, sub channel in low pass[...]

22 PROTECTION CIRCUITRY Your Reference705s is protected against both overheating and short circuits by means of the following circuits: • Main power supply fuses (Maxi - fuse at 40 amps) • Smart Power Supply Thermal Rollback activating at 85°C. • A fail - safe thermal protection circuit activating at 95°C. • Self - resetting circuit break[...]

23 SPECIFIC ATIONS POWER OUTPUT CROSSOVER SPECIFICATIONS (all continuously variable): 2 - way High Pass: 12 dB/octave, 60 - 240 Hz Low Pass: 24 dB/octave, 30 - 120 Hz 3 - way Tweeter High Pass/Midrange Low Pass: 12 dB/octave, 1 K - 4 KHz Midran ge or Midbass High Pass: 12 dB/octave, 60 - 240 Hz Mid High Pass/Midbass Low Pass: 12 dB/octave, 240 - 96[...]

24 SOUNDSTREAM TECHNOLOGIES 120 Blue Ravine Road  Folsom  Ca lifornia 95630 USA[...]