4
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 to 4 gauge power/ground wire.
• Auto High Current™ - Soundstream’s newest exclusive circuit which
automatically customizes your amplifier to its particular application—
High Current, low impedance loads (multiple subwoofers, less than 2
ohms mono) or High Power, higher impedance loads (2 ohms mono
and up).
• Coherent Stereo
TM
/Mixed Mono selection for either “pure” stereo
operation or mixed mono for simultaneous stereo and mono.
• Chassisink
TM
Darlington Power Array - Soundstream’s
“overbuilding” of the output section incorporates multiple output
transistors instead of a few for faster, stronger power delivery. The
transistors are sandwiched between the circuit board and the heatsink
in a design called Chassisink
TM
to ensure cool, efficient amplifier
operation.
• PowerGrid Power Supply Design - All power supply components
are located near one another, connected by thick, wide PCB traces,
which ensures rapid, high current delivery. The entire power supply is
isolated on one side of the circuit board while the audio stage is
located opposite it, guaranteeing minimal noise.
• Ultra-Low ESR Capacitance Bank - Multiple small input power
capacitors are used to provide a lower ESR (Equivalent Series
Resistance), which means more power in and out faster.
• Smart Thermal Rollback - Most amplifiers shut off when they get too
hot. In the unlikely event the REFERENCE644s amplifier reaches
85° C, it will gradually roll back its average power (without affecting
the dynamics). Once the amplifier has cooled off, it returns to full
power output. If overheating should continue, a second thermal
sensing protection circuit will shut off the amplifier if the heatsink
reaches 95° C.
• Fault Monitor LED on the top panel notifies you of blown power
supply fuses.
• 1/2 ohm Drive Ability - The REFERENCE644s amplifier is designed
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SAMPLE SYSTEM #6
2 channels of RCA input
2 bridged channels of high pass output
RCA line output set to low pass
Line output to an external amplifier driving subwoofers
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