1cuft is what my 10" subthump box is i think thats a bit big for these drivers. Maybe you are right since these are so called "free air" drivers. I myself dont put much into that though. I feel a speaker needs to be in a good wood box to really sound its best.
What sucks is when you go to a car audio store to demo speakers look at the enclosure they are in. They arnt in a metal/plastic door panel they are in nice thick MDF enclosures then when you install them they sound so different. worse
Here is another test i ran with the stock OEM driver. at 1ft, then at 3ft then i put the driver in a different .44cuft sealed box and ran another test at 1ft (GREEN)