Soundstream Reference Series 644S Installation Manual page 8

AUTO HIGH CURRENT™ POWER SUPPLY
The REFERENCE644s amplifier employs an extremely efficient Auto High
Current™ power supply (patent pending). This new power supply circuitry
automatically customizes your amplifier for optimum efficiency and power
output into virtually any impedance load. When other brand amplifiers are
driven at low impedances (i.e., 1 ohm or less), they shut down, squash
dynamics and power output (called current limiting), or waste huge amounts of
power (i.e., low efficiency). All of which reduce the "real world" power the
amplifier can produce in the car. Soundstream's Auto High Current™ power
supply allows the REFERENCE amplifiers to be one of two types of amps:
either producing maximum power at higher impedances (perfect for satellites)
or at lower impedances (usually with multiple subwoofers). This is done by
letting the amplifier's power supply continuously monitor the impedance of the
load the amplifier is driving. If the impedance drops too low, the power supply
will automatically switch into High Current mode. It will stay in this mode until
the amplifier is turned off. The next time it is powered up, it will be in the High
Power mode.
Unlike other amplifiers, Soundstream's REFERENCE644s amplifier can be
configured to drive virtually any impedance and make maximum power! The
major advantages of this power supply are:
awesome dynamic power capabilities
added continuous power with higher voltages
increased amplifier efficiency and reliability
Because of the dynamic properties of most music, all audio components
should be able to react accordingly. Thanks to their unique power supplies,
the REFERENCE amplifiers can comfortably exceed their rated power for
dynamic portions of the music.
8
SAMPLE SYSTEM #2
4 channels of RCA input
4 stereo channels of high pass output
RCA line output set to low pass
Line output to an external amplifier driving subwoofers
17