I have a 18 Inch ED sub that I am building a box for.

This is what ED recomends 3.5cF Tuned to 35Hz

What do you'll think? I relly want to get some low notes, I m not to good with tuning boxes though, Just building them.

And another ?

Does anyone know any sites that calculate the box size and what size boards to use?

I have plenty of room it is going in a extended cab ranger.