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Message: <blockquote data-quote="sounds_explicit" data-source="post: 8711149" data-attributes="member: 665284">Rear speakers are buzzing/humming They do not increase with rpms, changing the input or volume..If I have the car on the rear speakers will hum or buzz in a way. But if I turn the car off and turn the ignition to acc it goes away.  Could this be the rcas to the "rear" ?  I'm using a old pioneer  deh p2900mp at least 15 years old but it still does what I want it to. It only has 2 pre outputs. Front and rear with the rear as a switchable sub output. I have y splitters from the front pre outs giving me 2 rcas for a 4 channel amp but the fear speakers are the only ones that are humming or buzzing. My ground to the 4channel amp is bare metal under my seat. Is it possible I have created a ground loop ? Or does that not makes sense that it only does it when the car is running.</blockquote>

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