I have a 2ch amp that I will be adding a subwoofer using speaker level inputs to the sub, and my speakers are rated -3db at 52hz. I will be using it for both music and movies. I do enjoy the feeling of LFE and it seems generally the ported subs will go sub-20hz
Are there any benefits of going sealed?
A well designed ported sub will sound tight, flat and effortless. I built a pair and they sound amazing. The only benefit of a sealed sub is smaller enclosure and easier design/build if DIYed.