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Message: <blockquote data-quote="squeak9798" data-source="post: 1044096" data-attributes="member: 555320">Well.....without taking into account the passive radiator you added to the box; the number of subs doesn't change the tuning frequency.  The only thing affecting the tuning frequency is the box size, which would have changed by a tenth or two of a cubic foot by removing one sub (i.e. tuning wouldn't change by more than a few tenths of a hertz).  And, since you dropped another sub in the box; tuning would have remained the same.However, you added a non-powered sub to the box, which will act as a passive radiator (basically act as another port).............</blockquote>

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