A car subwoofer has an important role to play loud bass to help increase the overall sound in your car audio system. If your car subwoofer keeps cutting in and out at high volumes, this can indicate a problem with the car amplifier not getting enough voltage from the car battery. If your car subwoofer keeps cutting in and out at any given volume from the headunit, then this is most likely due to a connection issue in your car. Today, we are going to help you resolve this common car audio problem that most people struggle to find a solution for. A stock factory system has an electrical system designed just for the car itself and nothing further, although additional load can be added onto the battery. Things such as wipers, car heaters and headlights are what the stock battery and stock alternator is designed to power.
Adding a car subwoofer with an external amplifier is going to place more strain on your car’s electrical battery. Petrol cars in general have smaller batteries, as they don't need much cranking amps to start a car. On the other hand, diesel cars have larger batteries and often don't need upgrading when adding a small car subwoofer onto it, for example a vibe or edge preactive 12 enclosure with built in amp. Either way to prevent voltage drop, if your car audio system is more than 1000 watts rms, you want to upgrade the stock battery to a deep cycle one. A deep cycle stores and releases charge more efficiently compared to a regular starting battery. A high amp alternator is also a good suggestion, as it will allow more power to be provided to the car battery to keep up with constant battery drain.
If voltage drop is not an issue, then you will most certainly have a loose connection between your car amplifier and the car subwoofer. The first thing to do is check your rca cables from the back of the rca converter or headunit right to the car amplifier, are they loose? Do they sit tight on the RCA connectors? Also check the speaker wire is connect to the terminal cup firmly and also onto the speaker terminal on the car amplifier, making sure the connections are tight and screwed down. Often, I see that the speaker wire that connects the subwoofer to the speaker terminal cup found inside the subwoofer enclosure usually comes loose from vibrations overtime, causing a poor connection. I would recommend that you unscrew the subwoofer from the box and check the wiring inside.
Your car amplifier may also not have a sufficient enough grounding point. The ground is the shortest wire from your car amplifier wiring kit and is often colour black. This wire has a terminal loop attached onto it, which allows you to attach it to a new or existing bolt. I always file down the area around were the car amp ground wire is going to be attached. This is to ensure a good electrical connection because often overspray from paint can cause poor grounding for the car amplifier. Also, the bolt that is attached to the ground wire on the car amplifier may be loose and not tight enough. Using a spanner, ensure that the bolt is firm and that there is no movement from the connection.
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