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<blockquote data-quote="snoopdan" data-source="post: 1755898" data-attributes="member: 564991">Ahh, Pioneer head units....they are teh suk.&nbsp;&nbsp; There have been 3 people on my team that have had the exact same problem, including me.&nbsp;&nbsp; Pioneer&#039;s seem to have a standard problem with the grounding methods their head units use, that loose their grounding point on the op-amp output stage of the board inside.Ive tried a couple of ways to successfully eliminate about 90% of the noise, but you just cant beat it.....What I did is I used a bar choke filter from radio shack ($4.50) thats labeled for CB use, and wired it in series to the 12+ constant lead to the head unit.&nbsp;&nbsp; Additionally, I cut both RCA cables and tied a wire to the outer sheathing ground on them, and wired that to the frame of the head unit.&nbsp;&nbsp; Then after that, the real trick is getting the head unit in your car and not letting it come in contact with any grounding surfaces of the vehcile.&nbsp; Luckily in my jeep, all the radio mounts are plastic, so that wasnt a problem...however there was a little peice of metal for mounting in there that was grounded, and every time the head unit&#039;s chassis came in contact with it, the loop noise would return.&nbsp;&nbsp; So I just electrical taped the metal peice and wah-lah...90% less noise.&nbsp; I also bought one of those RCA to RCA in line noise adapeters from Radio Shack ($15) and that got alot of the noise out of it too.&nbsp; I used all of these methods, not just one to get less noise.I hope this helps ya, it took hours of dicking with grounding scenero&#039;s to figure that out on my own.</blockquote>

[QUOTE="snoopdan, post: 1755898, member: 564991"] Ahh, Pioneer head units....they are teh suk. There have been 3 people on my team that have had the exact same problem, including me. Pioneer's seem to have a standard problem with the grounding methods their head units use, that loose their grounding point on the op-amp output stage of the board inside. Ive tried a couple of ways to successfully eliminate about 90% of the noise, but you just cant beat it.....What I did is I used a bar choke filter from radio shack ($4.50) thats labeled for CB use, and wired it in series to the 12+ constant lead to the head unit. Additionally, I cut both RCA cables and tied a wire to the outer sheathing ground on them, and wired that to the frame of the head unit. Then after that, the real trick is getting the head unit in your car and not letting it come in contact with any grounding surfaces of the vehcile. Luckily in my jeep, all the radio mounts are plastic, so that wasnt a problem...however there was a little peice of metal for mounting in there that was grounded, and every time the head unit's chassis came in contact with it, the loop noise would return. So I just electrical taped the metal peice and wah-lah...90% less noise. I also bought one of those RCA to RCA in line noise adapeters from Radio Shack ($15) and that got alot of the noise out of it too. I used all of these methods, not just one to get less noise. I hope this helps ya, it took hours of dicking with grounding scenero's to figure that out on my own. [/QUOTE]

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