Box Size for DD 9515c

[littlepucker]

I am going to be running a DD 9515c with a carbon fiber dustcap on an Orion 2500D amp in a 99 Explorer.

So I need to know where I should tune my box, how big it should be etc. I will be doing a vented box, subs and port back. Slot ported in the center in between the subs.

I am thinking tuning around 30hz but I have no idea about how much voume these subs want or where they want to be tuned. I cant find anything on the internet about them.

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