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Ford AerostarOriginally conceived as an answer to the first Chrysler minivans, the Aerostar is an old school rear-drive van that's at its best when it's harnessed for hard work. It can haul--and tow--heavier loads than the front-drive crowd, and gets the job done with a fair degree of comfort and style.
We've got a 2003 Expedition and recently the subwoofer started to knock or pop intermitantly. There's no consistant situation or condition where I can reproduce the sound. It appears to be random.
Is this a speaker, amp, or receiver problem, and what do you suggest I do to correct it.
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Expedition Subwoofer "knocks" 
Linear Mode
