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Try purchasing a "ground loop isolater", when your head unit and amp are grounded in 2 diffrent locations the diffrence in volatage to ground between the two will cause interference.
Check the below link for more details, can be purchased of a shelf at you local radioshack
Hope this helps
actually you need a filter on the power supply of the DVD unit since this is what is causing your problem. putting a spike suppressor on your audio in is not a bad idea, but it will kill some of your bass response.