Depends on what you mean by "good sub." Mine are flat to 15 and my BK LFE added a TON of effect down low. That famous Hulk punches Abomination scene? I can now experience that low single digit response. Before, I could only read about it.
If you have subs that can get loud enough at those frequencies for you to feel it, more power to you. The majority of posters in this enthusiast forum don't even have that. Alternately, as was posted above, if you have a suspended wooden floor, your requirements to get that type of tactile feel are much, much lower. I know firsthand because my brother has such a room. I don't.