subwoofers don't "dig as low".
every bass driver can produce every bass frequency. the question is how efficiently and how loud.
the image dynamics parameters look more like an infinite baffle type driver and the xmax is more than likely 1/2 of what is specified.
xmax is the linear range and i kind of doubt that driver is linear across 3.5" of total distance. that would be spectacular.
if accuracy is what you are looking for, go back to the Dayton ho. :-)