Not all manufacturers measure ,low-end extension with the same yardstick, so imo you can’t necessarily make an apples-to-apples comparison between different manufacturers based on specs unless you have a pretty good idea of how they arrived at those specs.
(One manufacturer may assume a generous amount of boundary reinforcement, for instance, while the other does not. One may simply have a more optimistic marketing department than the other. I compete in another market where one of my strongest competitors claims an octave more low-end extension than I do... he makes really good speakers, but our real-world low-end extension is virtually identical.)
In general, a larger speaker will either go deeper or be more efficient, or some combination of the two, assuming both have the same type of bass loading (both ported, for instance).
Duke
(One manufacturer may assume a generous amount of boundary reinforcement, for instance, while the other does not. One may simply have a more optimistic marketing department than the other. I compete in another market where one of my strongest competitors claims an octave more low-end extension than I do... he makes really good speakers, but our real-world low-end extension is virtually identical.)
In general, a larger speaker will either go deeper or be more efficient, or some combination of the two, assuming both have the same type of bass loading (both ported, for instance).
Duke