I need some help with the size of a square port. I'm making a box for 2 type r 12", the box volume is 4.2sqf, due to limited space in trunk I'm only going to have 3" max for the port width, the height of the inside of box is 13.25", I want to tune the box to 31-33hz what will the length of the port need to be? any help will be appreciated,. Thanks.
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HU- Dodge Dakota factory
Subs- 2 Alpine Type R 12's
Amp- Infinity 611a
Box- Prefab Sealed
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