Help me with port calculations

[dgs1997]

Alright so Im trying my hand at my first box and I want to tune it around 32hz the box measures in inches at 14 width x 38 long x 21.5 height, this is the outside measurement the inside is 12.5 wide x 20 height and 36.5 long for inside, wood is 3/4 inch thick. Im wanting to do a slot port that is 12.5 wide but Im not sure on the height or the length of the port any help would be greatly appreciated, also the box is for 2 12s soundqubed hdc4s. If Im correct and could have someone verify me on this my port would be 12.5 wide 6.5 high and 30.5 long would this tune to 32hz or am I completely wrong

[Joe X]

Here something close to what you would want to build (in a trunk car), figure is just an assembly guide:

Enclosure Specifications:

Fb = 32 Hz
Vb = 4.5 ft^3

External Height = 14 in
External Width = 38 in
External Depth = 27.375 in

Port Width = 6 3/8 in

Cut Sheet List:

* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

Front = 30 7/8 x 12 1/2
Front Internal = 29 3/8 x 12 1/2
Back = 38 x 12 1/2

Left & Right Sides:
Side 1 = 25 7/8 x 12 1/2
Side 2 = 26 5/8 x 12 1/2

Top & Bottom = 38 x 27 3/8

L Port Internal Assembly Parts:

Front to Back = 19 1/2 x 12 1/2
Extension = 8 5/8 x 12 1/2