Up for sale is a good used Audi Wagon subwoofer.  This unit is wagon specific.  Typically this unit is found in high-end Avants with Bose only, this makes it pretty hard to find!  This unit is in good used condition, speaker foam is in good condition, unit sounds good!  List for the amp and sub box assembly was over $1000 from Audi! Very commonly these units fail due to over-use. 

Fits-

1998-2001 A6/Avant
2000-2005 A6 allroad quattro

A good used one really is the way to go.  

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