There is a amp in the trunk on right side under the deck. climb in trunk and look up. The amp could be the issue but it won't go from speaker to speaker. It will affect all at the same time unless it is a specific channel failing. I have read about all kinds of radio issues on here and everyone @ one point has said to disconnect battery for 30-60 min and see if that clears it up. I haven't had a issue yet so I don't know what it could be.
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Slappy 
02 Jetta GLX VR6 12v
Euro switch
short cold intake
TT 2.5 in borla catback w/o resonator
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