OK, I apologise if I came across as sarcastic - that was not my intention [some things come naturally to me...], it was an attempt at humour [misplaced?!], I should have attempted to debunk this instead.
In some way what hifitoaster said was right but also majorly incorrect in the way he put it across with his examples. Sure?
Driver's have T/S parameters. These T/S parameters determine in what volume of enclosure it will play to potential. Now, one can get a 3" driver [not all but there are many out there] to also play at 25 Hz or 30 Hz but quality will suffer, power handling will suffer and a host of other things will suffer. Will it reproduce "bass"? Yes!
Based on the driver's T/S parameters a box is designed having a particular derived volume. I can have a short deep box for the desired volume or a tall shallow box [a FS?]. Tall boxes and transmission lines? Let's not go there for this thread. One can load the driver in a enclosure having LESSER volume than optimal for that driver - it is upto the designer and his design goals for the built speaker.
So, an enclosure volume is determined by the T/S parameters of the driver one intends to load it with. Period! Like there are numerous ways to skin a cat, there are numerous ways to design the box shape for THAT volume.
Baffle diffraction? That's irrelevant to this thread about FS and BS. Diffraction is a given irrespective of whether it is a BS or FS. There's not only diffraction to deal with but a multitude of other things too in an enclosure so let's not even go there.
All this about a disconnected driver producing "current" by moving the cone, amplifiers "fighting" the said "current", compensating for sounding "tight" and "energetic", level's of vibration, running into distortion faster etc is above my understanding level - maybe hifitoaster should explain this better.
And, I promise not to be sarcastic any more in this thread.