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Originally Posted by SDcomuter
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So, any ideas???
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What type of power adapter are you using for your XM? Is it something that plugs into the cigarette adapter?
As a quick test, I would get a battery power supply for XM that does not plug in and is independent of the car or your house power. Then use the battery pack to see if the noise goes away.
To do it 'cheaply', get two, 6V lantern batteries and some alligator clip jumper cords. You can get these parts at any local Radio Shack and power the XM radio from the batteries wired in series to give 12 VDC. Then plug the XM into your existing AUX jacks and see if the noise has gone away OR is specific to the cigarette adapter.
I've read one reference to the XM adapter that suggests it has inefficient, active electronics. This could easily lead to a noise problem that on another power supply would not be a problem.
Alternatively, you might run an extension cord to the car and test the XM radio in the AUX jack using house power. Again, a different power interface and if the noise goes away, you've identified the problem.
Feel free to ask for clarification if any part of this seems strange.
Bob Wilson