I got my SVS PB2+ about two weeks ago and last night saw something which amazed me. I was watching "The Little Shop of Horrors" musical and discovered a long rumbling bass line at the end of the movie when Seymor electrocutes Audrey. I had the meter out and was recording about 114 DB at 3 feet from the sub and I saw the sub MOVE. I thought I was seeing things so I replayed the piece. The over 130 pound SVS PB2+ actually walked about 3 inches on my hardwood floor during the extended explosion. I suppose some of you old pro's have seen this before but this was news to me. Eric over at SVS recommended I use the overly thick rubber feet to curtail my wandering sub. Are these things amazing or what?