It can be annoying when your car subwoofer cuts out randomly when driving, sometimes it goes louder then loses its bass. There are many causes to this, the main culprit being an loose connection which is possible. But sometimes in rear cases, it is an indication that your car battery is going bad and can no longer provide a constant voltage to your car amp. When the voltage drops so can the bass, because the car amplifier will not be making full power at the lower volts, impacting the sound. Before troubleshooting any further, please get your car battery tested and your car alternator. Doing so now to give you peace of mind that your cars electrical system is fine or not or you could be potentially stranded one day when your car randomly fails to start.
If your car battery and alternator has been tested, and the test has come back as good, then lets troubleshoot further. The first thing you should inspect are all the terminals from the power, ground and remote wires. Is each wire crimped correctly into the metal terminal connector and going into the amp making good contact? To verify this, simply bend the wire slightly, is there any play or loose connection? If so, cut the wire, remove the insulation using wire strippers and add a new connector. If the power connections look fine, move onto the speaker connections on the car amplifier. Do they also look fine? Follow the same procedure for checking for loose connections on your car amp.
If the connections on the car amplifier look fine, the connections within the car subwoofer enclosure may be loose. This can happen due to vibrations caused by low bass from the car subwoofer.. Get a philips head screwdriver and remove each screw around the car subwoofer, remove the subwoofer from the box. Check the speaker wire connections that go onto the terminal cup inside the box to the car speaker. Are they loose, is there any play when moved with your finger? The best way to connect the speaker wire to the terminal cup is using a soldering iron to solder them on. This prevents the speaker wire from disconnecting or eventually falling off from vibrations over time.
RCA cables can also be faulty, they can get damaged by being bent by accident when moving your car amplifier in the boot while the RCA input cables had been attached. They may look fine on the outside but inside each RCA plug there are small wires they could be damaged. An new set of RCA cables are not expensive, so its worth swapping them over with shielded ones to get an good signal to your car subwoofer
In most cases, this car audio troubleshooting guide to fixing a car subwoofer cutting in and out should fix the problem. However, in some cases there can be an internal fault with the car amplifier, The solder points for any terminal connected to the PCB including RCA jacks can be loose. This can cause a poor connection with the car amplifier, causing an intermittent sound. Try a different car automotive amplifier, this will help you rule out what the root cause is.
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