How to Get Rid of Car Stereo Noise

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How to Troubleshoot Car Audio Speakers....5

Improper setup, frayed wiring and bad connections are several suspects if your car stereo produces noise. Rid yourself of unwanted noise with help from a professional car audio installer in this free video.

Part of the Video Series: Car Audio
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Video Transcript

So, to filter out engine noise from a car stereo, you may use one or both of these filters. Here we have a ferrite core electric filter, and here we have an RCA line level filter. Before we know which one we need, we're going to have to do a little trouble shooting. So, I've mocked up here a radio and amplifier installation, and it's a fairly common setup. We have a radio running on two RCA cables, to a four channel amplifier, and we have engine noise in the car, but first we need to find out where the noise is coming from before we can filter it out. So, you have to do some testing first, and the first thing you're going to do is start the car, go to the back of the radio and disconnect the RCA cable. If in disconnecting the RCA cable, the noise goes away, then you're going to want to reach for the electrical filter with a ferrite core and you'll filter either the power on the constant wire from the battery to your car stereo, or the ignition lead power that comes from the ignition switch to your car stereo. If in fact you unplug those RCA cables and the noise does not go away, then it may be that the noise is being induced along the run of these RCA cables by some other wiring in the car in the form of an electromagnetic noise that's radiating from a wire in the vehicle through the shielding of the RCA harness and being amplified by the amplifier. If you do unplug these and the noise continues, then you'll plug them back in to the back of the radio, and you'll go on to your amplifier. Then, we'll go and unplug them, usually in the trunk of the car from the amplifier. If in fact the noise goes away when you do that, then what you'll want to do is use an RCA line filter, and the way that works is you'll plug your RCA cables in here and then plug the other end of the RCA cables into the amplifier, and that should eliminate any engine noise. And that is how you troubleshoot and get rid of noise in a car stereo system.


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