"Don Pearce" wrote in message
...
On Tue, 6 May 2008 10:41:03 +0100, "David Looser"
wrote:

"Don Pearce" wrote in message
...

Fan-based subwoofers will do it.

What's a "fan-based" subwoofer?, and what will they "do"?

David.


A rotating fan with variable pitch blades whose angle is modulated by
the bass signal. What they will do is reproduce 0.1Hz quite nicely.


Is this something you've just invented? because it seems utterly pointless
to me. And I don't know what you mean by "reproduce". 0.1Hz isn't "sound" by
any stretch of the imagination, it cannot be heard, and is actually too low
a frequency even to be readily sensed as movement. The only sort of device I
can imagine that will "reproduce" 0.1Hz, in the sense of doing something
that a human could detect (other than by sight), would be a moving platform.

David.
..