Hey DarrinG this is DarrinH
.
My HT is in my basement.
The walls were built about an inch from the block, drywalled and then treated with carpet for zero reflection.
My floor has padding with carpet and my ceiling consists of drop tile.
http://home.hpphoto.com/servlet/Link...43fd2f&size=lg
http://home.hpphoto.com/servlet/Link...6c1614&size=lg
I have a SVS 39" tall sub and I can tell you the floor does not transmit any bass.
http://www.svsubwoofers.com/subs_pci_20-39.htm
The ceiling really moves and the walls move enough.
From experience, if you want the whole room to shake you are going to have to build that subfloor. I am happy with mine the way it is and I plan on adding bass shakers for the tactile transmission of bass later.
Hope this helps.