I also heard or rather felt it at the Denver RMAF show. Interesting concept and very cool but the construction requirements make it home use prohibative. As jeffereybehr points out it does and amazing job below 16hz it was interesting but the 12-14 foot of insulated box channel way to calm the sound of the fan blades in my opinion make it usefull maybe in commercial theatres. I laso wondr how much of the 2-9hz the human body can physically stand.
