That also depends on your hearing. Me and a couple of friends were watching a movie when i suddenly starter hearing (or to put it in better terms feeling) a very deep subbass sound, so i asked the house owner if he knew what the ***** was the cause of this sound. When both of my friends replied with "What sound" i thought they were joking. Turns out it was the sound of a ship going into a port that wasn't even near the house. Maybe you are as deaf as they are :P.
Jokes aside, they do have allot of subbass, and they go down to almost 10hz without showing any mercy whatsoever. The fact that they can go that low is nice, the quantity isn't.