Need help determining tuning freq

[crownvic02 10+ year member]

ok I have a box total cubes is 8.57 41.5w x 20.5d x 21h, and port is 4.25 wide x 19.5 height, and is about 21.5 long, box is single chamber for two 15s could someone tell the tuning frequency of the box

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[crownvicdriver 10+ year member]

Here are some pics of the box.

 

[DarkFox 10+ year member]

just over 82^2 inchs of port area, that length in that size box. gonna say somwhere in mid 30s. Should wang with 2 good 15's

 

[crownvic02 10+ year member]

oh its for two 15inch strokers

 

[lil_italy773 10+ year member]

thats close to mine..its 32-33 hz

 

[crownvic02 10+ year member]

when u measuring the port lenght do u measure tha wall that makes the L inside tha box, or do u measure center air flow of the port