What a lot of people may do is either cut out the center and actually run the port or direct the port through there.
Or a lot of other people just port their box through the rear deck. As in cut a hole, and run the port up to, or even through the rear deck. In most cases a beauty panel or something of the sort is made. This way, you still have rear fill when you are not full our bassing, and a lot of the spl is let in.
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