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First read through the following discussion, there is some great advice about whine and noise issues:

Whine is almost always caused by a ground loop and/or poor ground (power or signal).

Go through the system and check all ground points - make sure you have shiny, bare metal chassis ground points for all audio equipment. Check your "Big Three" connections.

Make sure you tape the RCA ground rings where you added the extension cables if they are exposed (you only want the RCA cables grounded at the source and destination points.

What head-unit are you using? Make sure it is well grounded too.
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