2500 watts, now what sub will sound good while taking them?

[rdzm50 10+ year member]

dd 9500 ftw

 

[95ZJ 10+ year member]

Sorry guys, I had to goto school and work. But I thought the DD9500 was an all out SPL sub, and I will have appx. 3 ft^3 before displacement. I've never built a box before, but I can get the measurements of under my backseat, if someone would be willing to help me figure out the box size.