This is almost always caused by a poorly-grounded RCA interconnect.
High squeal noise from speakers
Check that the Level control(s) is set to match the signal level of the head unit.
Always begin at the lowest setting.
Check that crossover frequencies for proper settings.
Check for short circuits on the speaker leads.
Distorted sound
Check that the minimum speaker impedance for that model is correct.
Check that there is good airflow around the amplifier. In some applications,
an external cooling fan may be required.
Amplifier gets very hot
This is caused primarily by poor quality RCA cables picking up radiated noise.
Route all RCA cables away from power wires, and use only the best quality
cables.
Engine noise (static type).
Check that the speaker leads are not shorted to the vehicles chassis.
Check that the RCA grounds are not shorted to the vehicle chassis.
Check that the head unit is correctly grounded.
Engine noise (alternator whine).
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Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remove speaker leads, and reset the amplifier.
If the Protection LED still comes on, then the amplifier is faulty.
Protections LED comes on when the amplifier is powered up
Check that all fuses are OK.
Check that amplifier is properly grounded.
Check that Remote Input (turn-on) at amplifier has at least 3 volts DC.
Check that RCA cords are plugged into correct inputs.
Check speaker wiring.
No Output
Reset Level Control.
Check Crossover Control settings.
Low Output
Check for good ground connection.
Check that Remote Input (turn-on) at amplifier has at least 3 volts DC.
Check that there is battery power on the + terminal.
Check all fuses.
Check that Protection LED is not lit.
If it is lit, shut off amplifier briefly and then repower it.
Troubleshooting
Amplifier will not power up.
Disconnect all RCA inputs from the amplifiers, if hiss disappears, then plug in
the component driving the amplifier and unplug its inputs. If hiss disappears,
go on until the faulty/noisy component is found.
High hiss in speakers
It is best to set the amplifier s input level as insensitive as possible.
The best subjective S/N ratio is obtainable this way.
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