Thanks for the info on the port plug, rmilewsk - it sounds like you'll plugging one port (I assume just one, as the other subs I've heard about using port plugs have typically left one port open) at the same time you switch the sub to the "bass extension" mode. As for the demo, they actually seem to have something of a tradition of avoiding blockbusters or "traditional" demo movies for their show demos - past selections have included Flight of the Phoenix and Vertical Limit.