upgrade subwoofer on bose system?

jason_jm

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Mazda CX-9
so I got my car finally......

the nav system is not nearly as bad as everyone was making out (so it isnt awesome but its far from terrible)

the bose sound system is WAY better than I was expecting, I was expecting junk, but i actually got decent to good....

wondering if anyone did a subwoofer upgrade? is it a powered sub in there? or being powered by an amp? so a new box with higher end sub could be installed in its place?
 
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