Sealed enclosure's you really cannot define to well as to what they'll " hit at " given what the Fs of the sub is for the enclosure sealed volume for the output of the F3 frequency response.
It basically is what it is and can be tweaked depending on the volume already there and either adding polyfill to smooth out the bass or add displacement to reduce the volume to tighten up the bass response.
A port box tuned low per what was already said should given ya what your looking for from the lows and still provide a decent amount of output as well.