help wit my pioneer deh-p790bt

[Jacerz]

well i switched out my cd unit in my car an went to try it,an got this very lound annoying whining noise..I dont undastand what i did wrong because the cd unit i had in there had no noise like dis one did.. The reason i changed it was becuz it was an older deck.. so if someone can plz let me know what they might think it is thanx.... Its a pioneer DEH-P790BT

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