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I just installed a new head unit into my 06 Chevy Cobalt LT w/ upgraded factory pioneer sound. I was experiencing a slight buzzing sound when I had the sound turned all the way down on any source. I tried re-grounding the head unit directly to the ground of the battery and still had the same thing. It kinda seems like the amp is getting to much power but i would not know how to make the sound stop or turn the amp down.
 

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If you are going to be using the factory amplifier you will need an impedance matching network or use the pre-amp out of the new unit if so equipped.
 
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