it all depends on tuning, generaly a ported box wont play notes much lower then an octave below tuning frewuency very well, i would try and tune around 32-35hzt if you plan on building a ported box. its really not that difficult, i like them better and theres lots of resoureces and references on this forum if you need help. slot ports are pretty easy to build. just make sure you follow the design to the tee or it will mess up your tuning