you could port the boxes..... but i wouldn't recommend it unless you know exactly what your doing.
the size and length of the ports is dependant on the sub and how big of a box you're making. If you're making the box for 1.75ft^3 then odds are for a ported you'll need the box to be around 2.25ft^3 and then you'd have to calculate out the length of the port. From where you're at right now I would say just leave it as sealed and you'll be happy.
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