Three Variables; One Constant 
Though there are many alignment dynamics responsible for how a speaker sounds, the system's overall performance corresponds to a specific balance of three elements: Efficiency, bandwidth, and size. No matter what the alignment, there's only so far that you can edify any one element without compromising the remaining two: Efficiency describes peak amplitude given set amount of input power, bandwidth describes the response range (low frequency extension, as it applies here,) and size describes the amount of physical space that the enclosure displaces.

Take efficiency, for instance; to improve it, you may have to make the enclosure a bit larger, compromise it's low-end extension, or do a little bit of both. To reduce it's size, you may have to give up some of it's efficiency or bandwidth, and so forth...

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