SOUNDSTREAM 705s - Manuals

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 b...

8 4 Ohm Sub Channel Watts 12 volts 14.4 volts 0 50 100 150 200 250 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 ...

9 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...

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 amplif...

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 th...

12 INSTALLATION 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 ground cables, which is the only size recommended. For system examples and diagrams, see pages 18 ...

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 battery. This will prevent a fire in the event of a shorted cable. The value of the circuit breaker or fuse...

14 INSTALLATION 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 with poor air flow, or when drivin...

15 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 ratios even with low output sources. In ...

16 CROSSOVER ADJUSTMENTS In most car audio installations, 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...

17 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 frequencies. The circuit consists of two controls. One adju...

23 SPECIFICATIONS 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 Midrange or Midbass High Pass: 12 dB/octave, 60 - 240 Hz Mid High P...

24 SOUNDSTREAM TECHNOLOGIES 120 Blue Ravine Road Folsom Ca lifornia 95630 USA