Noise with XM

[mfenske 10+ year member]

My wife and I both have Delphi MyFI systems in our cars. They are running in to the auxillary inputs on our decks (mine's an Eclipse 8454 and hers is a Pioneer DEH-P7400R). I modded the lighter plugs on both so that the system turns on and off with the ignition. When the XM unit is running off of the DC adaptor we both get a high pitched whining noise. It's not alternator whine because it's not speed dependant nor do we have the noise while listening to another source. I was thinking of adding some sort of filter cap either before or after the power supply unit or both. Any suggestions? Mark

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