I e-mailed the info@ account that's displayed on the website.  Went ahead and pulled the trigger on the purchase anyway.   For anyone in the future who wants enclosure information on the Incriminator Audio I Series--which, at the time of this post is not displayed on their website--this is what the pamphlet that comes with the sub says:   I Series 8 Sealed:  0.30 - 0.60 ft3, 0.45 recommended  Ported:  0.50 - 1.00 ft3, 0.75 recommended @ 35Hz  I Series 10Sealed:  0.60 - 1.00 ft3, 0.80 recommended Ported:  1.00 - 1.8 ft3, 1.40 recommended  @ 35Hz  I Series 12Sealed:  1.00 1.4 ft3, 1.20 recommended Ported:  1.5 - 2.5 ft3, 2.0 recommended @ 35 Hz