You should be very concerned. I'm not sure how they do it but Paradigm and a consortium of other high powered subwoofer manufacturers have managed to keep out of the media headlights well documented cases of subwoofer vibration completely destroying otherwise structurally sound buildings. Google "the 2009 Edina, MN apartment building collapse mystery" and read between the lines. It's scary stuff, but it gets even worse. Several victims of subwoofer abuse had hired a lawyer who was going to orchestrate a class action lawsuit on their behalf. Within days, he's walking down the sidewalk and a piano falls on his head. Freak accident -- I think not! Be afraid my friend, be very afraid.