Even if you're setting in a bass null, you still should feel the room shaking experience. I have a Logitech Z-5500 computer speaker in my bedroom and where I was sitting, which is the place where I use the computer, that place was a bass null as well. I can definitely hear the bass, but if I move back or go to a corner, the bass increases like by 10-15dB. I remember when I turn it loud enough when playing hip hop or a movie, I can still feel the vibration when sitting on the bass null. It doesn't shake a room (10 inch, 200 watt is not going to shake my bedroom), but it will vibrate the room when playing hip hop and rap. It might perhaps lift everything in my room by 1cm when I play a movie. But wherever you sit, you should feel the shake. Did you get your SPL meter?