There are two main factors that when combined as in EBP = Fs/Qes.
If you have a low Fs (around 15 to 25) and you have a high Qes (expensive large motor light cone) then you will end up with a low EBP suited for a sealed enclosure (less than 50).
My subwoofer is sealed and uses Fs = 21 and Qes = 0.49 for a EBP of 42. It is a tight sounding (aka musical) subwoofer that sounds quite different from ported designs.
See this
If you have a low Fs (around 15 to 25) and you have a high Qes (expensive large motor light cone) then you will end up with a low EBP suited for a sealed enclosure (less than 50).
My subwoofer is sealed and uses Fs = 21 and Qes = 0.49 for a EBP of 42. It is a tight sounding (aka musical) subwoofer that sounds quite different from ported designs.
See this