right steps for bass pro

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Hi to all,
im workin on mid-mid/bass speaker in a reflex enclosure for a big PA system.
I need to cover freq beetwen 150 and 1khz. If the project can sound even a little bit lower, could be better for other application.

My problem is playing with bass box pro 6 that givin me some strange results.

I start with the wizard, selecting my speakers (b&c 12mh32), and then when im in the box calculation window i got this problems:

-if I choose one of the 3 selected option (high out/hig fedelity/extend bass) the things works but give me out very small box something like 15l around... but with nice f3 and Fb, if I try to increase the volume like I need (needs means to fit in a 12" and a couple of vents) the value of f3 and Fb goes far from what i need.

-If I choose "enter f3" whatever I put i receive an error that said that f3 is too large or too small... never right! lol

So what is the right way to proceed with this program?
starting with a volume and adjust all the rest?

i need to be quick monday im with the carpenter lol

thanks a lot
 
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