Yes, it depends on sub bandwidth, the higher it plays, the nearer you get. Small satelites often require up to 200 Hz or more. Definitely 100 Hz is more suitable, also because nonlinear distortions are not so disturbing then.
A closed box has no "open-end", because the membrane should seal it (in reality, it is not that good). The calculation tool is not designed for lamdba/4 resonators or the like.
