Precision Power DCX 500.1 - Manual (Page 21)

ADJUSTING INPUT GAIN
1. Adjust all amplifier input gain controls to just above minimum
sensitivity (fully counterclockwise).
2. Using the cleanest music source (CD) playing, turn up the head
unit source volume until you can hear distortion. Now turn it down a
bit until you cannot hear the distortion (usually just below full
volume).
3. Increase the amplifier gain (clockwise) until the onset of audible
distortion. Then decrease the gain to the point just before the
distortion starts. This setting minimizes background noise and
prevents overload.
4. Repeat step 3 for any remaining independently controlled
amplifiers (rear and subwoofer gain controls) in the system.
HIGH MASS INTERNAL HEATSINK
The unique heatsink on your DCX amplifier has been designed with
fins on the inside of the aluminum extrusion. This allows for the
transfer of heat from the circuitry to the heatsink fins and out through
the vents in the endplates. Be sure you provide ample space around
the amplifier for cooling: at least 2” on all sides.
AP-IV PROTECTION CIRCUIT
Short Circuit Protection engaged: The DCX amplifiers will turn off
and try to come back on immediately. The amplifier will cycle like this
indefinitely with “blips” of sound each time. If this is the case, check
your speakers and wiring for low impedance and short circuits.
Thermal Protection engaged. The
DCX amplifiers will turn off and
after a minute or so will come back on. In this case, ensure that there
is nothing blocking the normal convection airflow of the amplifier. No
obstruction should be within 2” of the amplifier on all sides.
Note: Low battery voltage will cause the amplifier to run
warmer and possibly damage the amplifier.
TROUBLESHOOTING
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