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I ran the speakers without the amp and no more whining. Must have something to do with the amp (tried using different RCA and tried moving ground to other side of car no go). I wonder if the power wire powering the amp is the culprit it's about 10 years old? lots of hot and cold cycles in the engine bay.
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04 Titan SE Crew Cab 4x4 Off Road Big Tow Red Brawn.
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