All Sundown Audio amplifiers have multi-layer protection features to prevent damage from
misuse or faulty conditions to ensure long lasting life of your investment. If the unit senses
excessive heat, short circuited speakers, overload, or voltage fluctuation outside of the
working range the protection indicator light will turn red and the unit will turn off. In order to
solve this problem, you should turn all levels down, power off the unit, then carefully check the
installation for wiring mistakes or shorts. If the amplifier is excessively warm the protection
light will not turn on as the unit will turn off to protect itself from overheating. Let the unit cool
down for 30 minutes and try again. If the unit works, try moving the amplifier or make sure
nothing is covering it so it can vent heat from the heatsink. Before you remove or uninstall the
amplifier, refer to the list below for suggested solutions.
Amplifier Doesn’t Turn On or No Output
• Check the fuse(s), not just visually, but with a continuity meter and all 12+ volt, remote and
ground connection. Make sure you have 13+ volts. It is possible for a fuse to have poor
internal connections, take the fuse out of the holder for the testing.
• Check the input signal from the source unit using an AC voltmeter to measure the voltage
while it’s being played. The voltage should be from 0.2 to 6.0 volts from the RCA cables.
• Check the output of the amplifier, test for output at the speaker outputs of the amplifier.
• Check to ensure that the speaker wires are making a good connection to the amplifier and the
subwoofers.
Amplifier Goes Into Protection
• Check shorts on speaker wires or open coil.
• Check input voltage from RCA, if DC signal is over 4 volts, the amplifier will go into protect.
Remove and reset the power to the unit to check if it will turn on.
• Check impedance to make sure it’s over the minimum load, see the specification charts in this
manual for the minimums of your specific amp.
• Check input voltage. The amplifiers covered in this manual have a working range of 10.5 to
15.5 volts.
• Check chassis ground and remote using same ground.
Distorted / Attenuated / Noise Sound
• Check the chassis ground connections of all audio equipment.
• Check amplifier controls for errors, input level or crossover setting.
• Check the speaker wires for a possible short, either between the positive and negative leads
or between a speaker lead and the vehicle’s chassis ground.
• Check the nominal load impedance to verify that the amplifier is driving a load equal to or
greater than the specified minimums, see the specification charts in this manual for the
minimums of your specific amp.
• Check the input signal and input signal cables to make sure signal is present at the amplifier
inputs and the cables are not pinched or loose. It may be helpful to try a different set of cables
and / or a different signal source to be sure.
• Check speaker wiring for reverse polarity.
• If you hear a pulsing sound from your speakers, it means that there is something being overdriven.
• This could be due to a gain being set too high or a speaker impedance being too low, see the
specification charts in this manual for the minimums of your specific amp.
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