When determining what size enclosure one would need, does displacement need to be added to the recommended enclosure size. I have a newly purchased e5.10 which suggests a .5 cu ft box with a displacement of 1.86L = 0.0635664001 cu feet. So should I get an enclosure that is .5cuft or .56cuft?

 

if you're doing it by the manufacturer's recommendation, it's for the space inside the box which does not include the volume of the MDF.

note that some manufacturers will give you a number which already takes into account the speaker's displacement while others might not.

if you use the sub's specs to calculate a custom size box, you'll have to take into account the displacement of the speaker.