Design Questions AB XFL1522

[ᛒᛚᚨᛞᛖ]

Edited for narrowed down choice to XFL1222.

Vehicle :
09' Chevy Silverado Ext Cab

Location in the vehicle:
Behind drivers seat. Rear drivers side seat folded up.

Space available (Length x Width x Height):
36"W x 16"H x 16"D

Subwoofer make and model:
American Bass XFL 1222

Subwoofer Size:
12"

Number of Subwoofers:
1

Type of Port (Kerfed, Slot, Aero, etc.):
Slot

What type of music do you like?:
Big variety but mostly Old Rock, Old Country & Metal

Is your goal SPL or Everyday Music?:
Everyday

Tuning Freq (Hz):
33

Volume :
2.25-2.75

Powered by a RF Prime R1200.1. Planning big 3 upgrade. Plan to double baffle sub wall. Would prefer to have sub down firing if possible. ANY help for this old man is greatly appreciated!

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[deez283 10+ year member]

How much airspace does the sub you want to run require?

The available space you have is 4.2 cuft. before any displacements.

 

[ᛒᛚᚨᛞᛖ]

AB calls for 2.75-3.25 but I know manufacturers sometimes list smaller size than what is optimal.
I'm having trouble finding a definite answer on sub displacement but according to one person it is .05474
I attached a screenshot of the other specs I found for the 1522. Thanks!

How much airspace does the sub you want to run require?

 

[ᛒᛚᚨᛞᛖ]

Not sure if this is reliable but trying to figure it all out on my own at this point. Does this look good?