I have a 1998.5 A4Avant with the "Bose Concert" system. Audi and Bose claim it is has a 6.5" subwoffer located somewhere in the rear panel of the car. Anyone know exactly where the Bose Sub is located? I can't find it.

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I have a non-Bose stereo in the Avant. That plastic enclosure in the left side behind the access cover where the CD changer normally resides is the subwoofer.