AP-IV Protection Circuit

through the lower intake vents on the endplate. This cool air flows below the circuit board, through the fan and across the internal fins, cooling the heatsink. The warm air is then forced out through the upper end-plate exhaust vents.

Short Circuit Protection engaged: The DCX amplifiers will turn off and try to come back on immediately (the Short RED LED will illuminate). 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 (the Thermal RED LED will illuminate). 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.