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So i bought 2 12 inch audiohabn Subs with the Chrome Flame basket and want to show it off. I want to mount the upside down in a box but i'm not sure how that works for building the box. I'm confused about porting the box, if it needs that, or if it needs to be completly sealed or what? IDK any advice welcome, thanx

 
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invert mounting doesnt change anything about the box. just realize that the space the subwoofer normally takes inside the box isnt anymore.

however, for sealed boxes, you usually dont have to worry about that. and for ported boxes, if the woofer isnt too picky, the difference it makes in tuning frequency is all good.