I need some help as I am planning to build an enclosure for a hdc312. I figure the box should be 2.5 cubes gross and I want it tuned to 35 hz. I wish to use aeroports but I am not sure if 2 4"'s or 1 6" would be better. So which is the better choice: 2 4 inch or 1 6 inch aeroport or neither?

Also, if it would still sound good, how small could i build the box to save trunk space?