I have an old flatcone e15A, and the specs say it works in a box as small as .8 cubic feet... but when I had mentioned that on the ICIX forum, Ben started saying that the sub wouldn't fit in a box that small, and blah blah blah... so I posted a copy of the paperwork that came with it, and a printout of the specs I printed off the website that shows in several places where the sub was desigend for use in a box from .8 to 1.5 cubes, and he says that is too small, and that must have been a copy/paste error... but if it was a copy/past error, it happened several times, and someone would have noticed it at some point and had it corrected, so I don't know. I have a 1.5 and a 1.75 box for it, and I keep it in the larger box... but I guess if you mounted in inveted, it may work... but I doubt you will find any of those subs for sale anywhere.