Every car amplifier that is developed contains a protection mode circuit inside. This allows the car amp to protect itself if there are any electrical shorts taking place during audio playback. This prevents the transistors, capacitors and resistors from failing internally inside and cause any further damage to sensitive components. If your car amp is in protect mode, you are probably wanting to find out how to get it out of the special protection light flashing when the bass hits, when the volume is turned up. So first of all, you will need to find the reason to what is causing the amp to behave like this.
Check for any blown fuses. This is the top most common cause for every amp that comes to the shop that is in protection mode. Some amps from Alpine, Kenwood and JL audio allow the protection light to come on if the fuse is not intact. So pull out the fuse from the holder and check it. A burnt out fuse will have a snapped wire in the middle, you will be able to see it when you hold it up.
The grounding spot could not be strong enough. Having a weak ground means that the car amp is not running to its best abilities. This can be because there is not enough metal contact with the vehicle. So go back to your grounding spot and locate it. Remove the bolt from were you have mounted it and ensure that you have sanded down the area until you can see only but metal metal. This can be easily done using a file or sandpaper to remove any excess paint from over spray to provide a clean interruption free connection.
Bad RCA cables. These are used to provide music to the amp and come directly from the front stereo, so basically they feed an input signal. Sometimes they can be faulty and the shielding can be bad from overuse or poor weather conditions. So power on the amp with them unplugged this time. If the protection light goes off you will be aware that the RCA leads are to blame and will need replacing to fix this kind of car audio problem.
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