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Inverting a sub is free air flow. More air space = lower tuning. I am nuts and tune almost all of my subs to around 20, but free air flow would tune it to around 20- depending on the type of the subwoofer. Any note under 20 htz is what you can't hear. I wouldn't do it unless the specs specifically say that you can play them via free air flow. Otherwise your subwoofer will blow pretty damn quick...
no.. free air.. or infinite baffle.. means there isnt a box on EITHER side of the sub... like mounting a sub in the rear deck of a car... inverting a sub and bolting it back down into a box still makes it a boxed sub.. the sub doesnt case which side is which.. the only thing it changes is mount-ability and airspce