If your car amplifier keeps cutting in and out, this can impact the reliability of your car audio system. This common car audio problem can occur due to several reasons, the most frequent being an loose connection. The power and ground wires need to be connected firmly, the same also goes for the blue remote wire. If any of these connections is interrupted, it will cause the car amplifier to go on and off. This is because the car amplifier will not receive enough voltage from the car battery. When this happens, the car amplifier will shut itself down to prevent any internal damage to the components placed inside it. If your car amplifier is constantly powered on, then there could be an speaker connection issue. Again ensure that the speaker wire is connected to the positive and negative terminals on the car amplifier firmly. Get an screwdriver and ensure each gold plated terminal is screwed down. Also make sure the speaker wire is connected firmly into each metal post found within the terminal cup mounted onto the enclosure. Vibrations overtime can cause speaker wire to sneak out of the small insertion holes found on the metal terminal posts on the square terminal cup.
Furthermore, if the issue still persists, remove the subwoofer from the enclosure to check things further by simply removing the screws. Check the speaker wire is connected firmly to terminals found on the basket. If they are spade connection make sure they are pressed down.
Also check that the fuse holder is in good condition. I have seen several instances were the fuse holder has actually melted to an point were the red power wires are almost coming off. This can cause voltage drop. The reason why can car audio fuse holder melts usually in the first place is because of loose connections. Open your engine bay and inspect it. Make sure the fuse is nice and tight inside it too.
If you are still having issues with your car amplifier cutting off, then check that the RCA leads are firmly secured into the RCA outputs from the headunit and also check the car amplifier RCA inputs. Sometimes, pinching the metal outer part of the RCA more towards the centre pin will allow an tighter connection, as vibrations from bass can knock them off, causing an poor electrical contact.
If all of the connections are fine, then the problem may simply be due to the fact the cars electrical system can't keep up with the electrical demands of the car amplifier. This can happen when the voltage is below 10. Monitor your vehicles voltage level using an multi meter to see how low the voltage gets when you crank your car amplifier to the full volume level. If the voltage is below what is required to power on the car amp, see user manual specs, then this is the problem. The ideal voltage range is between 12 volts to 13.7 when the car is started. Trying upgrading the car battery to an deep cycle one from optima batteries, consider the big 3 upgrade and if your feeling lucky, get an bigger alternator fitted. More power equals more bass performance. You can also try an power capacitor, although it won't make an huge difference it could help with the situation.
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