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<blockquote data-quote="sierra4x4" data-source="post: 3172294" data-attributes="member: 577377">I just installed my first audio system, with the help of a friend with a few years experience with car audio.&nbsp; This is my setup (in a 2004 GMC Sierra):-Pioneer Premier P690UB HU-ZedAudio Gladius powering Rainbow SLC 265 Components-ZedAudio Minilith powering TC 10 OEM SubNow I am getting a constant high pitch tone from the tweeters.&nbsp; It reminds me of the occasional tone you hear from a TV or computer, but with a little more of a static buzz to it.&nbsp; The noise never changes volume or pitch, and is present when the ignition is in ACC.&nbsp; So that rules out Alternator Whine.Even if it is a myth, I kept good distance between all the signal wires and the power wires.&nbsp; And my amps and HU are all grounded to the same point, so I think that rules out a ground loop.&nbsp; I sanded down to clean, shiny, bare metal for the ground.I have read all about the infamous Pioneer grounding problem, and I have tried the solution.&nbsp; I coiled wire around the &quot;barrels&quot; of the preouts and grounded them to the &quot;chassis&quot; of the HU.&nbsp; That didn&#039;t help.The noise goes away when I unplug the RCAs from the back of the Gladius.&nbsp; So I think the problem is upstream from the amp.&nbsp; That only leaves about 20ft of RCA and the HU.&nbsp; Is it possible I have a bad HU, or is there something I am missing?&nbsp; Everything sound great, but whenever there is a quiet point in the music, I can;t help but be annoyed by the buzz.&nbsp; Any suggestions would be greatly appreciated.</blockquote>

[QUOTE="sierra4x4, post: 3172294, member: 577377"] I just installed my first audio system, with the help of a friend with a few years experience with car audio. This is my setup (in a 2004 GMC Sierra): -Pioneer Premier P690UB HU -ZedAudio Gladius powering Rainbow SLC 265 Components -ZedAudio Minilith powering TC 10 OEM Sub Now I am getting a constant high pitch tone from the tweeters. It reminds me of the occasional tone you hear from a TV or computer, but with a little more of a static buzz to it. The noise never changes volume or pitch, and is present when the ignition is in ACC. So that rules out Alternator Whine. Even if it is a myth, I kept good distance between all the signal wires and the power wires. And my amps and HU are all grounded to the same point, so I think that rules out a ground loop. I sanded down to clean, shiny, bare metal for the ground. I have read all about the infamous Pioneer grounding problem, and I have tried the solution. I coiled wire around the "barrels" of the preouts and grounded them to the "chassis" of the HU. That didn't help. The noise goes away when I unplug the RCAs from the back of the Gladius. So I think the problem is upstream from the amp. That only leaves about 20ft of RCA and the HU. Is it possible I have a bad HU, or is there something I am missing? Everything sound great, but whenever there is a quiet point in the music, I can;t help but be annoyed by the buzz. Any suggestions would be greatly appreciated. [/QUOTE]

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