Inputs and Outputs Notes
Power Supply and Output Devices:
High-current MOSFET devices are used in the power supply and output stages of
Anti-thump Circuitry: There is
a time delay turn-on with opto-coupled muting circuits for quiet, thump-free
High-speed, Audio-grade Components:
High-speed, audio-grade components are used in all low-level stages to help
ensure signal integrity.
Mode Buttons: There
is one mode button for channels 1+2, and there is a separate mode button for
channels 3+4. Each button may be set for low-pass or flat/high-pass operation. When
a full-range signal is desired for a pair of channels, the mode button for those
channels should be set to the high-pass/flat position, and the high-pass
frequency control should be set to "flat". When a mode button is in
the high-pass/flat position and the high-pass frequency control is in the
"flat" position, all frequencies above 15Hz are passed through to the
Low-pass Crossover: A
single dial controls the low-pass frequency for all of the channels set for low-pass
operation using the mode buttons. The low-pass crossover control is variable
from 40-200Hz with a 24dB/octave slope.
Crossovers: There are two high-pass frequency controls; one control is
for channels 1+2, and the other control is for channels 3+4. The high-pass
frequency controls are continuously variable from flat (full-range) to 200Hz;
the high-pass crossovers have a 12dB/octave slope.
Preamp Outputs: The
preamp output jacks provide a convenient source for daisy-chaining an additional
amplifier without running an extra set of RCA cables from the front of the
vehicle to the amplifier location. The position of the selector switch
determines the type of signals sent through the RCA line outputs. It may
be set to "low", "1+2" or "3+4". When set to
"low", the low-pass frequency control sets the low-pass crossover
frequency for the line outputs. Setting the switch to "1+2" allows you
to set the line output high-pass frequency with the channel 1+2 high-pass
frequency control. Selecting "3+4" allows you to set the line output
high-pass frequency with the channel 3+4 high-pass frequency control. Either
high-pass selector may be set to "flat" for full-range output.
Protection Circuitry: Reverse
polarity, thermal and short circuit protection circuits are used to help protect
the amplifier from damage and ensure reliable operation.
LED Condition Indicators: A
green power LED and a red protection LED are use to indicate the amp's operating
and Outputs Notes
Right Side of Amplifier:
- +12V, Remote Turn-on and Ground
Connections: gold-plated screw terminals; each terminal is 0.335"
- Speakers Outputs:
gold-plated screw terminals; each terminal is 0.335" wide
Note: The Warranty Card states that the amplifier is covered by
a 1-year parts and labor warranty if installed by an authorized U.S. acoustics
installer, otherwise the warranty is 90 days. However, U.S. acoustics has
extended a 3-year parts and labor warranty to all Crutchfield customers.
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