Help! Loud popping outside of at from speakers

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For the past few months my car has been loudly popping from the speakers. This can be heard from the house! Popping stops once I unlock and drive the car. There seems to be no problem with the sound. A mechanic from a ford garage could not find a problem with the speaker behind the panel but its worse than ever! It's embarrassing having people look all the time.

Anyone else experience there car popping wildly outside the car? Please help.

Chris
 
1. I haven't sat in the car long enough with it off to notice it.
2. It's coming from both speakers.
3. It's an in dash radio.

It's a popping noise that changes in regularity and in pattern. Sometimes it sounds like static. I have wondered if this is draining my battery somehow? Thank you for your response.
 
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