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If your car is humming while accelerating, you might be wondering what could be the cause. The problem isn't always immediately obvious, and it may be caused by several factors, including an unfavourably located subwoofer cable, poor power connection, or even a humming loop. If you find your car is humming, you can try a few simple solutions to eliminate the hum.
One of the simplest solutions is to reverse the polarity of your subwoofer's connection to its power source. To do this, simply reorient the power plug. Changing the polarity of the subwoofer may be as easy as reversing the orientation of each plug. If this is not enough, try purchasing an AC ground adapter from your local home improvement store. If your problem persists, check other components that are connected to the same power source. If you notice any, it is likely due to your subwoofer.
Another potential cause of humming in your subwoofer is a ground loop. If your subwoofer is plugged into a single AC circuit, the subwoofer's power amplifier may pick up an interference signal from your surrounding environment and pass it to your speakers. The resulting humming noise gets louder as the car accelerates. If it isn't, you should try plugging the subwoofer into another AC circuit.
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