Help making Tuned L7 vented box

[dcyphure 10+ year member]

i want a slot vented box for my 12" L7 kicker sub. Does anyone have either links, schematics...etc of all the dimensions i need to make my own?

As well as proper Slot vent size and length so its properly tuned to whatever freq. it requires best?

I have the manual but its not very helpful and no details on size of vent.

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