Never done it, always had other friends that were able to so Ive never had to mess with it. I can look for a how-to online, program is called Torres? Is there a mac version?I have a similar sized box for a hdc315. 4.0 cuft at 35hz. 66.67sq in of port. Double baffle.Idk what tuning those like but i could change the port length or width to fit it better.
Also sub displacement might be off by a little.
Have you tried designing your own on torres?
Not enough port areahttp://i1141.photobucket.com/albums/n600/Tmartin1475/aqboxwithdim2_zpsce1d8e1c.png
But I just realized you need anything but sub up port up. and the depth is off, I should've read better earlier.
Quick look at torres and i came up with this, maybe someone else can check and make sure it'd be good for an Fi
http://i1141.photobucket.com/albums/n600/Tmartin1475/fibtltorres_zps943889a7.png