They are thunderous. I was viewing the movie "Midway" when I heard a really strong rattle. At first I was afraid that I was bottoming voice coils. That should be impossible as I'm only feeding the subs 160 WPC. I immediately shut down the amps. I played the disc again, but only with the subs. The rattle came back. It wasn't the subs. The doors to my hallway bathroom and a bedroom were vibrating against their frames big time!