Quantum Audio QCA4400 - Manual (Page 3)

Line out
Full range line outputs have been provided for convenient connection to additional
amplifiers in the system. The outputs are buffered to reduce signal loss. Please note that
the amplifier’s input level adjusts these level outputs.
Power Fusing
This protects the amplifier against short circuits and excessive current.
Remote Turn-on
Automatically turns amplifier on when connected to the head unit’s remote output. The
amplifier will turn on and off with the head unit to save current consumption. This control
also operates the reset circuit for the amplifier’s protection. It must be connected with the
head unit in order to reset protection circuits.
Adjustable Input Sensitivity
Allows you to fine-tune the level matching between your source and the power amplifier.
Low Impedance Stability
QCA2500D-1 Ohm Mono
QCA3500D-1 Ohm Mono
QCA4500D-1 Ohm Mono
QCA4400-2 Ohm Stereo, 4 Ohm Bridged
F
EATURES AND BENEFITS
DC Offset Protection
This circuit protects the output of the amplifier against DC voltage. If for some reason DC
voltage is detected at the output stage, the amplifier will shut down protecting the speak-
ers from direct current.
Short Circuit Protection
The circuit protects the amplifier from damage due to a short found in the speakers or
wiring. If one of the speakers or its wiring comes in contact with ground, the amplifier will
shut down. To resume normal operation, correct the problem and turn the head unit off,
then back on. The amplifier will reset and play again.
Thermal Protection
To protect the amplifier circuitry against damage caused by prolonged exposure to high
temperatures, a thermal protection circuit is activated if the amplifier reaches excessively
high operating temperature. Once the thermal circuit is activated, the amplifier will shut
down to cool off. The amplifier will automatically turn back on once it cools down to a safe
operating temperature.
Power Indicator
The diagnostic L.E.D. illuminates when the amplifier is on and receiving power.
Built-in Crossover
The “Cozmik Series” amplifiers include a built-in variable crossovers. The crossover
features a variable frequency selection for precise low pass filtering for the QCA2500D,
QCA3500D and QCA4500D. The QCA4400 also offers the same frequency selection with
the option of low or high pass filtering.
Power and Speaker Distribution Blocks
Heavy gauge bare wire distribution blocks are provided for maximum power and signal
transfer with minimal resistance.
Bass Boost (QCA2500D QCA3500D QCA4500D)
For added low frequency performance the amplifiers are equipped with a variable *0~18
dB bass boost @ 45Hz.
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