As long as you own good speakers that (1) comfortably reach down to the low 30Hz range, whether floorstanders or bookshelves, and (2) have reasonably wide horizontal and vertical dispersion, you don’t need a subwoofer. I’m talking strictly about music listening. The problem with subs for music is that they are very difficult to blend seamlessly with the main speakers, especially in terms of pace and texture.
Movie watching is a whole different story.

