High efficiency digital D-class technology mono blocks.If the voltage is less than 12V with your car’s engine on, something has gone faulty inside the speaker. To verify that the speaker is the problem, get your multimeter again, and test its ports this time. If it starts up as normal, the problem is in the speaker your amp has just shut down to protect itself.

Remove any connection to the speaker, then turn your amp on and see if it’s still in power protection mode. To solve a grounding problem, clean your grounding wires, then reattach them more tightly to a location in your car where you’re certain they won’t rattle loose. If it reads more than 0.1V, your amp is almost certainly in protect mode because of bad grounding. A good sign of this is if the voltage on every terminal in your battery is low. To verify this is your problem, touch the black end of your multimeter to some inert metal on your car, then the red end to your amp’s ground terminal. Low voltage can be caused by bad grounding. Even so, following these six steps will get you through 90 percent of cases. We want to warn you at the start unless you’re a trained electrician with access to a fully-stocked workshop, you won’t be able to fix every power protect fault personally. If the amp itself has problems, like a blown fuse or a wire without insulation, it will shut down. If a speaker’s wire shorts out, or if you plug an amp into a head unit that’s already powered on, the amp might shut down to prevent the problem from spreading. Sometimes breakdowns in other sound system components can put your amp in protect mode when it’s connected. If your amp’s system gets too hot, it will enter protect mode to keep itself from melting. Amps that handle too much power without enough cooling airflow can overheat. If an amp has an impedance of 2 ohms, a speaker with less than 2 ohms will overwhelm its circuits, putting your amp in protect mode. Amps will refuse to work if whatever’s plugged into them has a lower electrical resistance than their minimum threshold. Causes of Power Protect ModeĪmps go into protect mode for many reasons. If you can’t turn your amp’s power light on even by pressing the button, you might be in protect mode. These amps indicate protect mode by blinking the power light before shutting down completely.

Some amps don’t even have power lights, but this doesn’t mean they don’t have protect circuits. Some protect lights are green or blue instead of the usual red. Sometimes the protect light turns on for two seconds when the amp does, like a check engine light, and then shuts off.

If your amp isn’t a code-talker, it’s still important to understand what its lights are saying at all times. Just check which sequence the light is blinking in, look in the manual to see what it means, then skip ahead to where we talk about solutions. If the last part is true, you’re on easy street. If the protect light blinks in code to tell you what the problem is.What color the protect light is supposed to be.Manuals contain tons of information, so if you’re overwhelmed, here are the things to look for: If you lost it or threw it away, you can almost always find it in PDF form by searching for the model number.

The boring but practical answer is to read your amp’s owner’s manual.

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