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<blockquote data-quote="Xenozx" data-source="post: 6783063" data-attributes="member: 613336">The biggest issue w/ grounding the head unit, is pioneer does their RCA&#039;s like this:<img src="http://www.jtaudio.net/shop/product_images/pioneer_wiring/avh-6500_rca.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" />I have four things I am going to try tomorrow to try to identify this problem.1.) buy a 4 channel amp from bestbuy (to return later) and use it to test to see if maybe the rest of my setup just doesnt like the alpine PDX 4.100 amps.2.) Ferrite cores, I am going to see if I can pick up a couple snap on ferrite cores and snap them onto my power cable coming from the battery and maybe the RCA&#039;s too if I can find them small enough.3.) Ground loop isolator from radioshack (i had a friend of mine look at the ground loop isolator and the shield of the RCA&#039;s attached to it dont even look connected<img src="http://www.xenshardware.com/images/Evo2009/IMAG0013.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />4.) try a different power wire.&nbsp;&nbsp; This is really the only variable I havent taken out yet.&nbsp; I have a 4 gauge wire running from my + battery terminal to a Distro block.&nbsp;&nbsp; the rockford distro block then splits that and runs 2 4 gauge cables off to both my amplifiers.&nbsp; My sub doesnt have this noise at all.&nbsp; The inside speakers do.</blockquote>

[QUOTE="Xenozx, post: 6783063, member: 613336"] The biggest issue w/ grounding the head unit, is pioneer does their RCA's like this: [IMG]http://www.jtaudio.net/shop/product_images/pioneer_wiring/avh-6500_rca.JPG[/IMG] I have four things I am going to try tomorrow to try to identify this problem. 1.) buy a 4 channel amp from bestbuy (to return later) and use it to test to see if maybe the rest of my setup just doesnt like the alpine PDX 4.100 amps. 2.) Ferrite cores, I am going to see if I can pick up a couple snap on ferrite cores and snap them onto my power cable coming from the battery and maybe the RCA's too if I can find them small enough. 3.) Ground loop isolator from radioshack (i had a friend of mine look at the ground loop isolator and the shield of the RCA's attached to it dont even look connected [IMG]http://www.xenshardware.com/images/Evo2009/IMAG0013.jpg[/IMG] 4.) try a different power wire. This is really the only variable I havent taken out yet. I have a 4 gauge wire running from my + battery terminal to a Distro block. the rockford distro block then splits that and runs 2 4 gauge cables off to both my amplifiers. My sub doesnt have this noise at all. The inside speakers do. [/QUOTE]

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