On 12/06/2013 12:02 PM, William Sommerwerck wrote:
"dave" wrote in message
m...

We learned 16 Hz is perceived more as a train of pulses and
less like a sinusoidal tone; it is right on the border of flatulence.

When I put 16Hz through the Watson woofers in my concrete-slab
apartment... //nothing// audible came out of the woofers. But everything
in the room rattled.

Like when we have mild earthquakes.