Re:Dumb rich material, the best market in the worl (Score 1)

Note also that, even if our ears could pick up sounds around the 20Hz mark, we would be unlikely to hear them if listening in an ordinary room. At high power, we might feel the air moving at that frequency but the sound wave would simply be too long to propagate. Consider v=fl (using l for lambda here) where v is the speed of sound, f is the frequency of the sound and l is the sound's wavelength. Assuming that v=330m/s (a reasonably good approximation) and f=20Hz (as alluded to, above), we arrive at l = 330/20 = 16.5m, which is a wee bit longer than any axis of a room likely to be employed for computer use.