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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 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 Reference705s can
4 ohm Power
200 watts x 1 @ 12 volts
Read this, or sparks will fly!
The Soundstream REFERENCE705s amplifier has extensive internal power supply capacitance, called the Ultra-
Low ESR Capacitance Bank. Multiple small input power capacitors act as an internal "stiffening capacitor".
Because of the large amount of internal capacitance, there may be a sizable spark when connecting the power
and ground lead to the amplifier for the first time. In order to charge the capacitor bank without a spark, we
suggest you do the following:
1. Connect the +12 volt cable to the amplifier and to the battery.
2. Connect one end of the ground cable to the chassis of the vehicle.
3. We have supplied a 150 ohm, 2 watt resistor with the amplifier. One leg of the resistor has been connected
to the ground terminal of the amplifier.
4. To charge the capacitor bank, touch the loose end of the ground cable to the open leg of the resistor for at
least 45 seconds.
5. Remove the resistor, and connect the ground wire.