sup, good find on the data !
I'm not so sure on that speaker It does tune down amazingly low for such small air space (and being a 10) , but at some of the lower tunings the F3 appears to be above the Tuning point. F3 is the point where the box loses half of its loudness .
at .95 Cubic feet i'm seeing a 45.1 hz and a 45 Hz so its tuned to the F3 ...

I'm not sure if specs are off a lil or what because their website shows different tuning data . i need to find a few other companies with specs out and recommended boxes with specs and see if the program i'm using is off, or if Image Dynamics is fudging its tuning points a bit.
when i've compared other companies its usually right on (such as pioneer)
At .64 cubic feet (.8 Q) the box will be tuned to 51, with a F3 of 46 that's Much better. now its tuned to a point where it isn't at half volume.
and the F3 didn't move much
At .46 Cubic feet (.9 Q) its tuned to 58 hz, with an F3 of 48. an ever larger spread

.
that's probably a touch high for rap music.
at .39 Cubic feet (1.0 Q) its tuned to 64 with an F3 of 50
at .26 Cubic feet (1.2 Q) its tuned to 77 with an F3 of 56
maybe go with this sub, this is a Crazy steal
http://www.hifisoundconnection.com/S...id/0/SFV/30046
but you will need a lot of power if you want to push 3 of them.
.42 Cubic feet (1.2 Q) would tune to 48, with an F3 of 35 !!!. now that's more of what you want. that sub will need like 400 rms / 800 peak though ... maybe more. its power hungry.
3 of those with 1200 rms ... yeah that would be loud