Why does my amplifier enter protect mode?

If your amplifier enters protect mode, this means its protection circuit has been activated.

The Protect function is designed to protect the amplifier against overheating, short circuits, excessively low impedance or power supply problems, for example.

On many amplifiers, this is indicated by a dedicated protect light coming on.

What can cause protect mode?
The most common causes are:

• Excessively low impedance: The speakers or subwoofer place a lower-ohm load on the amplifier than it is designed to handle.

• Short circuit: Speaker cables may be damaged or touching each other or the car’s chassis.

• Overheating: The amplifier gets too hot due to high load or insufficient ventilation.

• Voltage problems: The amplifier receives a supply voltage that is too low or too high.

• Incorrect grounding: Poor contact between the amplifier’s ground cable and the car’s chassis.

• Internal fault: A component in the amplifier may be damaged.

How do I troubleshoot the problem?
Start by switching off the sound system and checking the power and ground connections.

Then check that the speaker cables are not damaged and that the total impedance is compatible with the amplifier.

If the amplifier gets very hot, let it cool down and check that it has sufficient ventilation.

You can also check the supply voltage with a multimeter.

If the problem persists, the speaker load can be disconnected to check whether the amplifier still enters protect mode. Always do this with the power switched off and follow the manufacturer’s instructions.

If the amplifier enters protect mode even without speakers connected, despite a correct power supply, this may indicate an internal fault.

Contact our customer service team or visit one of our stores for further troubleshooting.