don pearce wrote:

Eeyore wrote:
David Looser wrote:
"Don Pearce" wrote
"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.

All the DACs I know have inbuilt high pass filters anyway so I'd like to know
how you'd find 0.1 Hz coming out of an audio system.


Filters are finite things, there'll be some, you can be sure. And even
if you don't have a DAC that goes low enough, just pop on an audio sig gen.

What is it you have with grasping at straws ?

Graham