I am also interested in one of the Clark units which I would mount under the floor - one of the things slowing me up is that I can't find a better price than at SmartHome and the other is that the amp that they sell is $300 which seems like a lot just to supply power to shake the floor - especially since my Sony receiever did not cost much more..

If I get any smarter on this, I will let you know..

Cheers, Jim.