How To Fix Car Subwoofer That Keeps Rumbling Without Music Input

If you are getting a low rumble sound from your car subwoofer without music playing volume off and no input, its because of interference. When your subwoofer makes all sort of rumble sounds its because of electrical static thats getting through the inputs of the car amp. There are many different variables that can come into play that can stop the rumbling sound from your car subwoofer. 

1) RCA cables. These are the main culprit that can cause your subwoofer to rumble randomly when there is no music played. If you are using cheap ebay cables, the wires inside the connector could not be soldered on correctly. This can cause interference to be heard through the speakers connected to the car amp. So, try a high-quality cable that has more thickness because this is usually an indication of better quality shielding. If its not the cables, there is an issue with either the RCA ports on the car amp or the back of the headunit. You will need to use a multimeter to check for any kind of shorts.

2) The gain is set too high. This controls how much level of input you are giving to your amp. Your speakers might be sensitive when music is not playing. So, turn down the gain control on your amp to reduce the rumbling and static. 

3) Bad ground. This is the last possibly cause to having problems with a rumbling subwoofer. Now a bad ground can be anything from paint or rust that is left remaining on the metal to mount the ground wire to. The best way to ensure a solid good ground from your car amplifier is to scrape off any excess paint or similar particles using sandpaper or a file. This will certainly ensure the best possible connection and minimise any kind of interference
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