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OPERATION
After initial set-up, the amplifier should not require any further adjustment unless there is a change in the car stereo
or speaker system with which it is used.
1 Power Indicator
The Power LED functions as a power and warning indicator. The indicator is white when the power to the
amplifier is off. When the indicator is green, the amplifier is operating normally. The LED illuminates red to
indicate that the self-protection circuits have been activated and have shut off operation of the amplifier. The
protection circuits may be triggered by the temperature of the unit rising above a safe level or by an overload
condition. If activated by a rise in temperature, the unit will resume operation after cooling off to a normal
operating range. If activated by an overload condition, the source of the overload must be found and corrected
to resume operation of the amplifier. Most overload conditions are caused by mis-wiring or operation into
incorrect speaker loads. Re-check all wiring and connections if this situation occurs and correct as necessary.
2 Level (Gain) Controls
The amplifier is capable of operating from sources supplying a wide range of input levels. The Level controls
should initially be set to the mid-rotation position. If it is found that there is not enough output even when the
volume control on the car stereo is at its maximum setting, adjust the Level control of the respective channels
to increase the output from the system. If, however, there is still output from the amplifier when the car stereo
volume control is at its minimum setting, or the output level increases too fast with a small rotation of the volume
control, adjust the Level control to decrease the output from the system. Once the correct setting is found, these
controls should not require any further adjustment.
3 Filter Selectors
These switches allow selection of the frequency filters that permit the respective channels of the amplifier to
be used to reproduce the entire audio range, just the bass, or all frequencies above the bass range.
In the "OFF" position of the switch, the response is flat and unaffected so the entire audio frequency range is