I don't really have to much time to build another box right now so I have two options. 1.95 cubic feet after displacement tuned to 30hz or 1.88 cubic feet after displacement tuned to 32hz. Single 12 with an alpine mrp650 on it.

I vote bigger.

Bigger then the ones listed or the bigger of the two.

Bigger one

The bigger one*

The bigger of the two should be fine.

Thanks guys I was a bit worried about the lower tuning messing up the output.

I doubt you will hear the difference between the two enclosures. Since its personal preference install it in both boxes and see which you prefer.