I need to find the correct specs for building a box or to give to a shop so they can build it for me. I'm planning on going with a sealed box for this.
The subwoofer is a Adire Shiva Mark IV


This is all I could find:

APPLICATIONS
Box
(net box size)
Performance
(SPL is peak in bandwidth)
1.0 foot3 sealed
Use 16 ounces polyfill
Anechoic: F3 of 41 Hz, 115 dB SPL
In Car: F3 of 34 Hz, 132 dB SPL
In Room: F3 of 39 Hz, 124 dB SPL

2.0 feet3 sealed
Use 24 ounces polyfill
Anechoic: F3 of 33 Hz, 113 dB SPL
In Car: F3 of 25 Hz, 131 dB SPL
In Room: F3 of 31 Hz, 124 dB SPL

3.0 feet3 sealed
Use 32 ounces polyfill
Anechoic: F3 of 31 Hz, 113 dB SPL
In Car: F3 of 21 Hz, 131 dB SPL
In Room: F3 of 27 Hz, 123 dB SPL

2.0 feet3 tuned to 25 Hz
Vent: 3”ID by 10.75”L
Use one flared vent
Anechoic: F3 of 32 Hz, 116 dB SPL
In Car: F3 of 27 Hz, 134 dB SPL
In Room: F3 of 29 Hz, 124 dB SPL


3.0 feet3 tuned to 20 Hz
Vent: 3”ID by 11.25”L
Use one flared vent
Anechoic: F3 of 25 Hz, 115 dB SPL
In Car: F3 of 19 Hz, 133 dB SPL
In Room: F3 of 23 Hz, 124 dB SPL

5.0 feet3 tuned to 18 Hz
Vent: 4”ID by 15”L
Use one flared vent
Anechoic: F3 of 19 Hz, 114 dB SPL
In Car: F3 of 15 Hz, 135 dB SPL
In Room: F3 of 17 Hz, 124 dB SPL

 

if your gonna go sealed , 10-12" woofer, 1.25
cu.ft. for a 12 and .08 cu.ft. for a 10
the formula for boxes is length times width times height. take that total and divide by 1728.
1728= 1 cu.ft.
12 times 12 times 12=1728

 

Check out there homepage. They don't have any specifics listed for the mark 4 but if you post at the12volt.com there is someone who works for adire that could help you out.