what would be the port tuning on this

[pookie7919]

External Encloser Dimensions
Width - 24"
Height - 14"
Depth - 16"

Slot Port Dimensions
Slot Width - 1.5"
Slot Height - 12.5"
Slot Length - 18"

SLot will make an L shape in the box.. with the EL at - 2"
el- extention length

I got about 2.00ft^3 but i can't figure out teh port tuning on it.. any help would be appreciated

[pookie7919]

Driver is Power Acoustik 10" mofo.. dont' know the displacement.. sub is about almost 7"s mounting depth and is basically 8inches accross the magnet

[pookie7919]

if i wanted to get around 38-42 hz what and how much would i have to change.. on the slot lenght/width/