Stock Bose System - Grounding Issues?

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JasonFH

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All of a sudden (some time last week). I'm getting a high pitched whine that coincides with the RPM of the engine. Seems to come primarily from the right rear door speaker, but not 100% positive. I'm assuming this is a grounding issue. Any thoughts on what to try first or where to look?

'05 5.3 LT 4x4 with the Bose system, XM and built in overhead DVD player.
 
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