Just wondering what size sealed enclosure this sub should be in.

I've tried a couple of sub box programs like WinISD and Blaubox and I'm getting stupid readings like 71litres??

Qms: 8.87
Qes: 0.58
Qts: 0.54
Re: 3.44ohms
Le: 1.18mH
Fs: 29.24hz
Xmax: 11.91mm
Vas: 53.9lt or 1.87sqft
RMS: 250wrms

Thanks guys...