I guess my question is about how to select a driver by reading its
specs. In this case, both have an Fs of 29Hz. The only remarkable
differences are the one point is Vas, and the significant difference
in Qms. Is it reasonable to think you can predict a speakers freq.
performance based on reading specs alone, or does this capability
come from running the numbers on a variety of drivers to get a
feel for how each of the specs effect the result? In other words,
plain old experience. I there a table that describes how each
of the specs inter-relate? Something like, "Vas and box size are
proportional. Qms is proportional to low end performance, but the
optimum value is around blah with a Vas around blah."

Thx, Chris