Ok I spent a little time analyzing this today and what Ihave rulted out is the PLasmacluster and the console and dashboard. It seems to be from the left channel and is very prevalent on Sirus and not so I have not heard it on CD and need to spend more time with the Radio. I am wondering if the Sirus tuner has issues. The sound sounds liek a staticy crackling noise very noticable on speaking and some highs. And i do nto beleive it to be their compression as it is noticable on some music that has very pronounced vocals. I wonder if there is an issue witht he Sirus tuner over driving the JBL or maybe it is a JBL problme with the input side. I need to listen to another car when I get a chance. BTW the JBL system kicks some serious ***!