If you are using an aftermarket car amplifier to power your car door
speakers or an additional car subwoofer, an slight interference can
destroy your listening experience. Any slight buzzing or humming when
you start your cars engine or when you accelerate can become apparent if
your car audio install is not done correctly. There can be many reasons
as to why this may happen, the most common being an poor grounding
spot. To ensure the car amp ground location is providing good
conductivity with your car's negative terminal on your car battery, the
location were you mount your car amp black ground wire needs to be
prepared correctly. This involves using sandpaper or an file to scratch
off any existing paint that can block electrical contact between the
ring terminal and the car's chassis. You also need to ensure the ground
is tightened and not loose, because this can also cause an poor
connection. An good socket set will help you achieve this, as using your
hand to tighten an bolt won't give an durable connection.
If your have re checked your car amp ground wire and it is optimal, then the second cause can be the RCA cables are picking up noise from the red 12 volt power cable. This can happen when the red power cable is fed down the side of the car together with your RCA cables. It may take longer to do, but the proper way is to turn them each to the opposite side of the vehicle to eliminate any interference being picked up.
Also if your are using cheap RCA cables, then the shielding will also be poor. You can generally tell from the thickness of the RCA cables. Cheap very thin cables don't have any or may have minimal shielding to prevent unwanted noise into your car audio system. Upgrade your RCA cables to higher end ones to reduce the chances of interference being picked up my car your stereo.
If you are using an RCA converter because you're using the stock factory radio, then ensure that the black ground wire is connected to any grounding point on your car. Often this wire is overlooked and not connected, most people just connect the speaker wires that tap into the stereo loom. The black ground wire on most RCA converters is added on to prevent interference and it is something that you should consider connecting. You can also try adding an inline noise suppressor car stereo filter that you can buy from amazon or ebay. This is an box device with RCA inputs and RCA outputs that connected between your car stereo and your car amplifier. This box has bits inside it to prevent unwanted noise to stop buzzing or whining from your cars engine. I have had alot of success and yes I can say that they do work.
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