Hey Harleyqn,
I had a hissing like sound which came from the tweeter/speaker in the drivers side rear passenger door(The speaker next to the door handle) To me it sounded like a geiger counter going off, refer to this clip but skip to 2.00mins to hear the sound i'm talking about. http://www.youtube.com/watch?v=TCqsnap6a1A. Same like yours, the offending noise only came from the one speaker.
It bugged the crap out of me, but was gone in 2 days and hasn't come back, so i never got VW to look at it.
Hopefully yours rights itself, otherwise take it in to VW to get it looked at.
Cheers,
Jayse.
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