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 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 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 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.
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