The sub transducers you saw in Damarks catalog are indeed used in 
Home Theater applications. In fact there is an outfit that has a "high end" 
transducer that was recently reviewed briefly in Home Theater magazine. The 
pair cost over a grand ($1,000 US) and were attached to 12 inch plexiglass 
disks that bolted or screwed to floor joists or furniture. 
        The reviewer chuckled at the idea before he tried them, but in the 
end really liked the effect. I would imagine they would be especially 
effective in a small listening area with smaller or lesser powered systems or 
for systems lacking big subs. The Damark price seems a lot closer to what I 
would pay to have something "vibrate my butt for effect" than the high-end 
models.
        The Home Theater reviewer said that he could no longer take exception 
with critics that accused him of doing his critical listening for reviews 
with his rear end. 8-) Really cute review though.
Cheers, John
--- Maximus/2 3.01
---------------